НЕЛИНЕЙНО-ОПТИЧЕСКИЙ КОМПОЗИТ

Изобретение относится к оптике. Нелинейно-оптический композит содержит наночастицы с полупроводниковым ядром и металлической оболочкой, ядро наночастицы изготовлено из полупроводника с глубокими примесными уровнями в запрещенной зоне, причем энергетический зазор между дном зоны проводимости и примесными уровнями не превышает энергию фотонов рабочего спектрального диапазона композита. При воздействии излучения происходит насыщение примесного поглощения в ядре наночастицы, что вызывает увеличение сечения поглощения и рассеяния всей наночастицы в результате увеличения амплитуды плазмонного резонанса. Техническим результатом изобретения является уменьшение энергетического порога нелинейно-оптического отклика. 2 ил.

ИСТОЧНИК УЗКОПОЛОСНОГО ТЕРАГЕРЦОВОГО ИЗЛУЧЕНИЯ, ВЫРАБАТЫВАЕМОГО В МОНОКРИСТАЛЛЕ НИОБАТА ЛИТИЯ В НАПРАВЛЕНИИ РАСПРОСТРАНЕНИЯ ВОЗБУЖДАЮЩИХ УЛЬТРАКОРОТКИХ ЛАЗЕРНЫХ ИМПУЛЬСОВ

Полезная модель относится к области оптического приборостроения и касается источника узкополосного терагерцового излучения. Источник включает в себя фемтосекундный лазер с линейно поляризованным импульсным излучением, оптико-терагерцовый преобразователь и прозрачный для терагерцового излучения поглотитель лазерного излучения. Оптико-терагерцовый преобразователь выполнен в виде пластины, сориентированной поверхностью одной из ее сторон с возможностью воздействия на нее лазерных импульсов и изготовленной из монокристалла ниобата лития с длиной прохождения лазерных импульсов в данном монокристалле, равной длине поглощения в нем терагерцового излучения. Кристаллографическая ось [100] монокристалла ниобата лития лежит в плоскости входной поверхности пластины и образует угол 45° с направлением вектора поляризации возбуждающего лазерного луча, а кристаллографическая ось [001] этого монокристалла образует с входной поверхностью пластины угол, выбираемый из интервала 62-75°. Технический результат ...

СПОСОБ ПОЛУЧЕНИЯ СОВЕРШЕННЫХ КРИСТАЛЛОВ ТРИБОРАТА ЦЕЗИЯ ИЗ МНОГОКОМПОНЕНТНЫХ РАСТВОРОВ-РАСПЛАВОВ

Изобретение относится к способу получения монокристаллов трибората цезия с нелинейно-оптическими свойствами, которые могут быть использованы в лазерной технике при изготовлении преобразователей частоты лазерного излучения. Кристаллы CsB3O5 (CBO) выращивают из расплава, который, наряду с оксидами бора В2О3 и цезия Cs2O, содержит добавку третьего компонента - оксида переходного металла, образующего химическое соединение с оксидом цезия, например оксида ванадия или оксида молибдена. Для приготовления шихты используют карбонат цезия, борную кислоту или оксид бора, оксиды молибдена или ванадия. Шихту, состав которой лежит в области первичной кристаллизации CBO на диаграмме плавкости Cs2O-В2О3 - третий компонент, готовят одним из двух способов. Первый заключается в твердофазном синтезе из компонентов или соединений, при разложении которых образуются компоненты смеси. Процесс приготовления шихты состоит из однократного или многократного изотермического отжига, охлаждения и измельчения продукта ...

НЕЛИНЕЙНО-ОПТИЧЕСКИЙ КРИСТАЛЛ СТРОНЦИЙ БЕРИЛЛАТОБОРАТ, СПОСОБ ВЫРАЩИВАНИЯ НЕЛИНЕЙНО-ОПТИЧЕСКИХ МОНОКРИСТАЛЛОВ СТРОНЦИЙ БЕРИЛЛАТОБОРАТА И НЕЛИНЕЙНО-ОПТИЧЕСКОЕ УСТРОЙСТВО

Данное изобретение относится к нелинейно-оптическому кристаллу нового типа стронций бериллатоборат (химическая формула Sr2Be2 B2O7, сокращенно SBBO). Соединение SBBO синтезируется в результате химической реакции между веществами в твердом состоянии при высокой температуре синтеза. Для выращивания монокристалла стронций бериллатоборат применяется флюсовый метод, в котором в качестве флюсовых растворителей используется SrB2O4, NaF и другие фториды. Результаты измерений показали, что это соединение имеет следующие структурные и физические характеристики: пространственная группа: PG3(C 6 6 ), точечная группа: C6, элементарная ячейка: , , Z = 2, . SBBO относится к кристаллам с отрицательной оптической осью. Эти кристаллы могут широко применяться в генераторах гармонического излучения, в оптических параметрических устройствах и усилителях и в оптических световодах в ультрафиолетовой области. С помощью этих кристаллов можно получить когерентное световое излучение на длине волны короче 200 нм путем ...

Способ быстрого выращивания кристаллов типа KDP со стержневидной затравкой

Изобретение относится к технологии выращивания кристаллов типа KDP из раствора. Способ включает изготовление емкости для выращивания кристалла, при этом двигатель установлен в верхней части емкости для выращивания, а соединительный стержень кристаллодержателя присоединяется к нижнему концу вращающегося вала двигателя; изготовление кристаллодержателя для выращивания кристалла, при этом кристаллодержатель включает в себя верхнюю перекладину 7, поддон 12, соединительный стержень 6, боковые несущие стержни 8, 9 и две лезвиеобразные перемешивающие лопасти 10, 11; соединительный стержень 6 закрепляют по центру верхней перекладины 7; нижние концы боковых несущих стержней 8, 9 диаметрально противоположно закреплены на двух краях поддона 12, а верхние концы боковых несущих стержней 8, 9 прикреплены к двум концам верхней перекладины 7; лезвиеобразные перемешивающие лопасти 10, 11 закреплены на боковых несущих стержнях 8, 9; две лезвиеобразные перемешивающие лопасти 10, 11, боковые несущие стержни ...

УСТРОЙСТВО ДЛЯ ОГРАНИЧЕНИЯ ИНТЕНСИВНОСТИ ЛАЗЕРНОГО ИЗЛУЧЕНИЯ

Изобретение относится к области оптической техники, а именно к ограничителям мощности приемников лазерного излучения, и может найти применение для защиты глаз, оптических систем и приемников лазерного излучения от разрушающего действия входного излучения высокой мощности. Устройство для ограничения интенсивности лазерного излучения состоит из корпуса, ориентированного вдоль направления распространения излучения и содержащего две собирающие линзы, в фокальной плоскости которых расположена герметичная ячейка, заполненная инертным газом. При этом первая из линз размещена на входном торце корпуса, а вторая - после герметичной ячейки. На другом торце корпуса после второй линзы установлен фильтр с нелинейным поглотителем. Технический результат заключается в обеспечении возможности повышения степени защиты оптических систем от действия высокоинтенсивного лазерного излучения, поступающего на вход ограничителя, а также в обеспечении возможности увеличения срока службы устройства. 2 з.п. ф-лы, 1 ...

Монокристаллический материал SrMgFи способ его получения

... 1. Монокристаллический материал SrMgF, обладающий способностью к преобразованию лазерного излучения в ВУФ/УФ-области спектра от длины волны 0,122 мкм до 11,8 мкм с коэффициентами нелинейности для моноклинной фазы d=0.044 пм/В и характеризующийся наличием сегнетоэлектрических свойств, выращен из расплава SrMgF, имеющего температуру плавления 1173 K, методом Бриджмена в двухзонной вертикальной печи.2. Способ получения монокристаллического материала SrMgFоптического качества выращиванием из расплава SrMgF, имеющего температуру плавления 1173 K, методом Бриджмена в вертикальной двухзонной печи с температурами 1470 K и 970 K в зонах печи при температурном градиенте в области роста 10-20 К/см, скорости опускания ампулы порядка 1 мм/день и охлаждении в режиме отключенной печи с последующим отжигом кристалла.

Оптический композиционный материал и способ его обработки

... 1. Оптический композиционный материал, включающий суспензию наночастиц сульфида металла в водно-спиртовом растворе, нитрат металла и органический полимер, отличающийся тем, что материал содержит в качестве сульфида металла сульфид свинца, в качестве органического полимера поливинилпирролидон.2. Способ обработки оптического композиционного материала по п. 1, включающий облучение материала электромагнитным излучением с длиной волны 455-635 нм и последующую выдержку при комнатной температуре без облучения в течение 0,1-24 часов.3. Покрытие, изготовленное нанесением оптического композиционного материала по п. 1 на поверхность твердого материала и имеющее толщину 0,1-0,5 мкм.

Optische Wellenlängenwandlervorrichtung zur Erzeugung der zweiten Harmonischen

OPTISCHE SCHALTER

Verfahren zur Herstellung eines optischen Elements

NICHTLINEARES OPTISCHES ELEMENT.

Diffraktive optische Vorrichtung

Verfahren zur Herstellung einer Frequenzverdopplungsstruktur in einem optisch nicht-linearen Medium

Optischer Schalter

Glasfaser

ANORDNUNG ZUR DETEKTION UND BEHANDLUNG VON OPTISCHER STRAHLUNG.

MESOMORPHE POLYMERE MIT SEITENKETTEN MIT HOHER DIELEKTRISCHER ANISOTROPIE UND VERFAHREN ZU DEREN HERSTELLUNG.

Coating for nonlinear optical applications

Coatings are claimed which are obtd. by splitting off of the gps. R and also: alpha-positioned protons from a "polyethylene" mixt. (A), such splitting being caused by deposition of a layer (B) on mixt. (A), where (A) = a mixt. of (i) polyethylene contg. repeat units of formula --CHRa-CHRRb-n- (I) and (ii) a polymer different to (i); and (B) = a layer of (non)metallic nitrides, oxides, carbides, oxynitrides, carbonitrides, carboxides or carbo-oxynitrides. In (I), R = -OC(O)NR1R2, - OC(S)OR3, -SC(S)OR4, - S(O)R5, -OS(O2)R6, -Se(O)R7, -O-M(R9)p, -O-C(O)R10 or a substd. oxy-linked N-contg. heterocyclic gp. of formula (II); Ra, Rb and R1-7 = H, halogen, NO2, CN, 1-50C alkyl or alkoxy, 3-50C cycloalkyl or cycloalkoxy, 6-18C aryl or aryloxy or 4-18C heteroaryl, each gp. opt. contg. substits., each (cyclo)alkyl or (cyclo) alkoxy gp. opt. having one or more double bonds and each gp. opt. being interrupted by heteroatoms or heteroatom-contg. gps.; R8 and R10 = 1-50C alkyl or 3-50C cyclo-alkyl; R9 ...

Nichtlineare optische Einrichtung zum Erzeugen von Harmonischen

Schichtelement und Verfahren seiner Herstellung

Verfahren zur Herstellung einer einkristalliner Schicht

HERSTELLUNG EINER INVERTIERT GEPOLTEN DOMÄNENSTRUKTUR AUS EINEM FERROELEKTRISCHEN KRISTALL

Optischer integrierter Schaltkreis mit Verzögerungsleitung

NONLINEAR OPTICAL MATERIAL

Deuterated l-arginine phosphate monohydrate

The new crystal deuterated l-arginine phosphate monohydrate provides an excellent frequency conversion crystal for laser applications, especially in the one micron wavelength region.

A method for generating coherent optical radiation by optical mixing.

Disclosed is a method for generaing coherent optical radiation by intracavity optical mixing in a cavity that is resonant for the radiation generated by the lasing of a lasant material and an input radiation.

Holographic optical memory using semiconductor microcrystallite doped glasses

Doping

Doped phenol-formaldehyde resin films for waveguides

A method of forming optical waveguides is described in which a film of a novolac resin is deposited on a transparent substrate and a dopant material is incorporated into the film during or after the coating step. Additional quantities of the same or different dopant may be incorporated into the dried film by solvent assisted indiffusion.

Etching method

Optic fibre aperiodic Bragg grating

A raman amplifier having an aperiodic grating structure

The invention provides a Raman amplifier or laser comprising a Fabry-Perot cavity, said cavity comprising at least one end mirror comprising a grating having an aperiodic structure. The grating has a selected response characteristic and any repeated unit cell in the structure is significantly longer than a characteristic length associated with the selected response characteristic. Such an arrangement allows the creation of a composite cavity for all Stokes wavelengths.

Non-linear optical stacks

Nonlinear crystal

A nonlinear crystal 17 that comprises a first end face 19 and an opposing second end face 20, the first and second end faces being separated along an optical axis 21 of the non linear crystal by a length L in a range of 0.25 mm to 2.5 mm. The nonlinear medium may be formed from formed from BBO (Beta Barium Borate); LBO (Lithium Triborate); Lithium Iodate; Lithium Niobate; Potassium Niobate; KDP (Monopotassium Phosphate); Gallium Selenide; or KTP (Potassium Titanyl Phosphate). The crystal may comprise a brewster cut (figure 3(b)) or right angle cut (figure 3(a)) nonlinear crystal. The crystal may be used in an enhancement cavity frequency doubler (27, figure 4) that comprises a ring cavity defined by four or more mirrors (10, 11, 12, 13, figure 4) in which servo control electronics rotate the nonlinear crystal in response to a wavelength tuning of an input optical field. The crystal may be used in an enhancement cavity frequency mixer. A method of processing a bulk crystal to produce the ...

LOW-COST ELECTRO-OPTIC MODULATORS AND OPTICAL FREQUENCY CONVERTORS IN GLASS WAVEGUIDES

NON-LINEAR OPTICAL DEVICE

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

NONLINEAR OPTICAL BODIES AND DEVICES

OPTICAL SWITCHES

OPTICAL COMPOSITIONS.

PROCEDURE FOR THE SYNTHESIS FROM FUSION SOLUTIONS OF KTIOP04-TYP-KRISTALLEN OR MONO PHOSPHATES OF POTASSIUM AND TITANYL.

ORGANIC NONLINEAR OPTICAL MATERIAL.

HEATHARDENABLE NLO SYSTEM AND ON IT BASING OF INTEGRALS OPTICAL COMPONENTS.

ELECTROOPTICAL QUALITY SWITCH WITH SINGLE CRYSTAL OF THE TYPE LANGASIT

DEVICES TO THE STIMULATED EMISSION FROM SILICON NANO-PARTICLES

OPTICAL SWITCH

POLYMERE ONE WITH NLO ACTIVE SIDE'S GROUPS AND WITH SMALL OPTICAL LOSS

METHIN AND AZOMETHINFARBSTOFFE ON BASIS OF NAPHTHOCHINONEN IN THE NONLINEAR OPTICS

AT LEAST FÜNFLAGIGE OPTICAL DEVICE

COLLOIDAL PHOTONS CRYSTALS

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE, COHERENT SOURCE OF LIGHT AND OPTICAL EQUIPMENT, WHICH THE OPTICAL TRANSVERSE ELECTROMAGNETIC WAVE DEVICE MENTIONED USING

Unsymmetrically substituted fluorenes for non-linear optical applications

Optical waveguide device, coherent light source using same and optical apparatus having same

Fabrication of nanowires

Composite nonlinear optical film, method of producing the same and applications of the same

SECOND HARMONIC GENERATION BY CARBAMIC ACID DERIVATIVES

QUANTUM WELL STRUCTURES

Wavelength conversion crystal and method for generating laser beam, and apparatus for generating laser beam

Polyaniles

Self-assembled superlattices and waveguides prepared for use therewith

APERIODIC LONGITUDINAL GRATINGS AND OPTIMISATION METHOD

The invention relates to the field of grating structures. The invention provides a longitudinal grating having an aperiodic structure, wherein the grating has a selected response characteristic and any repeated unit cell in the structure is significantly longer than a characteristic length associated with the selected response characteristic.

METHOD OF FABRICATING OPTICAL NONLINEAR THIN FILM WAVEGUIDE AND OPTICAL NONLINEAR THIN FILM WAVEGUIDE

A Ge-added SiO2 thin film (12) is formed on a glass substrate (10), and a metal film (14) is formed thereon (S11 to S13). By etching the metal film (14), a pair of electrodes (14a, 14b) mutually opposed at a predetermined interval is formed (S14). An insulating thin film (16) is formed on the insulating film (12) and the electrodes (14a, 14b) (S15). While applying ultraviolet radiation, a high voltage is applied between the electrodes (14a, 14b) to perform ultraviolet excitement polling to impart an optical nonlinearity to a channel region (18) (S16). By controlling the voltage application to the channel region (18) having the optical nonlinearity, the light transmitted through the channel region (18) is controlled. Thus, an optical nonlinear waveguide for propagating single mode light is formed on a glass substrate.

LIQUID CRYSTALLINE POLYMER SUBSTRATES WITH ORTHOGONAL MOLECULAR ORIENTATION

In one embodiment this invention provides a polymeric nonlinear optical medium comprising a thin substrate of wholly aromatic thermotropic liquid crystal polymer having a uniaxial orthogonal molecular orientation.

OPTICAL WAVEGUIDES AND THEIR MANUFACTURE

OPTICAL WAVEGUIDES AND THEIR MANUFACTURE Optical fibre contains a colloidal semiconductor dispersed in the core or the cladding or both. The fibre may have active regions in which the semiconductor is dispersed and passive regions in which the semiconductor is dissolved. This is obtained by drawing a preform to get fibre in which the semiconductor is dispersed and selected portions (or else the whole fibre) are treated to precipitate the semiconductor in colloidal form.

POLYMER COMPOSITES

Case 6286/6399(2) POLYMER COMPOSITES A polymer matrix has grown therein in vitro and in situ non-centrosymmetric crystals of organic or inorganic compounds. The crystals are preferably orientated and may be used in electro-optical systems.

NON-LINEAR OPTICAL ACTIVE DIOLS AND POLYURETHANES PREPARED THEREFROM

Polyurethanes having high hyperpolarizability densities and other favorable properties can be easily prepared from nonlinear optical active diols (NLO-diols) of a certain general formula, which have a delocalized ? electron system to which both an electron donor group and electron acceptor group are coupled directly (D?A system). The polyurethanes may be used in optical waveguides.

OPTICAL FIBER

An optical fiber capable of producing white light with a sufficiently wide wavelength band and of stabilizing the polarized state. The optical fiber can produce white light in wavelength bands on both sides of a pumping light pulse inputted by a nonlinear phenomenon. A core (1) of the optical fiber is clad with a first clad (2), which is clad with a second clad (3). The ratio (.DELTA. 2/.DELTA. 1) between the relative refractive-index differences .DELTA. 1, .DELTA. 2 of the core (1) and the first clad (2) with reference to that of the second clad (3) is -0.4 to -0.85. The ratio of the outside diameter of the core (1) to that of the first clad (2) is 0.4 to 0.7. The relative refractive-index difference .DELTA. 1 is 0.6 to 1.2%. The transmission loss of light with a wavelength near 1.4 .mu.m is 10 Db/km or less. Stress imparting parts (4) for imparting stress to the core (1) are provided on both sides of the core (1) in the second clad (3) to make the fiber a constant polarization optical ...

RADIATION-RESISTANT LINBO3 AND OPTICAL DEVICES UTILIZING SAME

OPTICAL ARTICLE EXHIBITING HIGH SECOND ORDER POLARIZATION SUSCEPTIBILITY AND LOW TRANSMISSION ATTENUATION

OPTICAL ARTICLE EXHIBITING HIGH SECOND ORDER POLARIZATION SUSCEPTIBILITY AND LOW TRANSMISSION ATTENUATION An optical article is disclosed comprised of an organic layer unit exhibiting a second order polarization susceptibility greater than 10-9 esu and means for providing an optical input to and an optical output from the layer unit. The organic layer unit exhibits a transmission attenuation of less than 2 dB/cm and is comprised of a Y type Langmuir-Blodgett assembly having superimposed oriented monomolecular layers of first and second polymeric amphiphiles each containing repeating units comprised of a hydrophilic moiety and a lipophilic moiety. Repeating units of one or both of the first and second amphiphiles each contain an organic molecular dipole, and repeating units of one or both of the first and second amphiphiles each contains a branched lipophilic moiety of up to 9 carbon atoms.

SECOND HARMONIC GENERATION AND SELF FREQUENCY DOUBLING LASER MATERIALS COMPRISED OF BULK GERMANOSILICATE AND ALUMINOSILICATE GLASSES

... 2112138 9300605 PCTABS00019 A method for preparing a material so as to exhibit second harmonic generation for optical radiation that passes through the material. The method includes a first step of providing a bulk glass comprised of substitutionally doped silica and a charge transfer dopant. The bulk glass is prepared for frequency doubling in accordance with a method that includes a step of irradiating the bulk glass with optical radiation having a first wavelength and a second wavelength, the bulk glass being irradiated for a period of time sufficient to obtain a desired amount of conversion efficiency of the first wavelength into the second wavelength. The silica is substitutionally doped with an element selected from the group consisting of Ge and Al, and the charge transfer dopant is selected from the group consisting of Ce3+, Nd3+, and Eu2+. In another embodiment of the invention the silica is substitutionally doped with Ge and the charge transfer dopant is comprised of naturally ...

FUNCTIONALIZED HETEROAROMATIC COMPOUNDS FOR NONLINEAR OPTICAL APPLICATIONS

Heteroaromatic nonlinear optical compounds, alone, and in combination with a chemically inert medium to provide a combination exhibiting second order nonlinear optical properties, including combinations that dispose a layer of the nonlinear optical compounds on chemically inert substrates, blend guest molecules of the nonlinear optical compounds with a chemically inert host matrix of a thermoplastic polymer, or covalently bond pendant side chains of the nonlinear optical compounds to chemically inert polymers.

OPTICAL COMPONENT BASED ON LANGMUIR-BLODGETT LAYERS

Optical component based on Langmuir-Blodgett layers An optical component comprises an electromagnetic radiation-transparent polymeric medium having a secondorder susceptibility of at least 10-9 electrostatic units where this polymeric medium comprises compounds having polar-aligned noncentrosymmetric molecular dipoles which have as structural element an electron acceptor which is bound to an electron donor via a conjugated .pi.-electron system, which makes possible an oscillation of the molecular dipole between a ground state having a first dipole moment and an electronically excited state having a second dipole moment different from the first, and the nonionic polymeric medium comprises an alternating arrangement of at least one Langmuir-Blodgett film each of at least two different nonionic polymers having nonlinear optical properties Besides high mechanical and chemical stability the optical component of the invention has excellent nonlinear optical properties, for example frequencydoubling ...

NONLINEAR OPTICALLY ACTIVE POLYMERS

Organic groups covalently bound to a polymer backbone provide second or third order nonlinear susceptibilities to the polymer. In another aspect, a method is disclosed for providing the novel polymers of the invention. Polymers of the invention can be directionally oriented to provide useful optically nonlinear media for use in nonlinear optical devices such as optical switches or light modulation devices.

EPOXY POLYMERIC NONLINEAR OPTICAL MATERIALS

The present invention is directed to an epoxycontaining polymeric material having nonlinear optical properties, particularly a glycidyl amine polymer, and a process for making the nonlinear optical (NLO) epoxycontaining polymeric material including poling the polymeric material under high voltage at elevated temperature for a period of time to bring about orientation of the nonlinear optical functionalities in the polymer. The polymers have enhanced thermal stability and good NLO properties.

WAVEGUIDE ELECTROOPTIC LIGHT MODULATOR WITH LOW OPTICAL LOSS

In one embodiment this invention provides a thin film waveguide electrooptic light modulator which consists of (1) a laminated assembly of a waveguiding thin film of an organic polymer which exhibits second order nonlinear optical response, and upper and lower organic polymer blend cladding layers, each of which has a lower index of refraction between about 0.002-0.02 lower than the waveguiding thin film, and which exhibits second order nonlinear optical response and (2) electrodes which are positioned to apply an electric field to the laminated assembly.

HIGH X(2) OPTICAL ARTICLE WITH IMPROVED BUFFER LAYER

HIGH x(2) OPTICAL ARTICLE WITH IMPROVED BUFFER LAYER An optical article for the propagation of electromagnetic radiation is disclosed comprised of an electrically conductive support on which a poled polymeric film exhibiting a glass transition temperature of at least 80.degree.C and a second order polarization susceptibility greater than 10-9 electrostatic units is formed. A layer for enhancing the transmission of electromagnetic radition is interposed between the electrically conductive support and the poled polymeric film. The transmission enhancement layer is an amorphous layer of at least 0.5 .mu.m in thickness having a refractive index less than that of the polymeric film and a resistance less than 10 times that of the polymeric film. The transmission enhancement layer being comprised of a mixture of (a) at least one metal oxide or fluoride and (b) a low molecular weight aromatic compound.

NONLINEAR OPTICAL DEVICE

Non-Linear Semiconductor Optical Device

POLYANILINE COMPOSITIONS, PROCESS FOR THEIR PREPARATION AND USES THEREOF

... 2067142 9105979 PCTABS00005 Self-protonated sulfonic acid substituted polyaniline compositions, processes for their preparation and uses thereof. The sulfonated polyaniline compositions are useful for conduction of electricity, absorption of electromagnetic radiation, modulation of electromagnetic beams and modification of the electromagnetic response of sulfonated polyaniline compositions by chemical or electrochemical means. The sulfonated polyaniline compositions are also useful as a high density erasable data storage medium for use in information storage and process applications. The sulfonated polyaniline compositions provide electronic, chemical, electrochemical and optionally microelectronic devices which use and control the chemical and physical properties of the compositions.

FUNCTIONALIZED HETEROAROMATICS FOR NLO APPLICATIONS

FUNCTIONALIZED HETEROAROMATICS FOR NLO APPLICATIONS. Nonlinear optical materials having highly conjugated fused ring structures of two or three aromatic or heteroaromatic rings, at least one of which is a five-membered heteroarmatic ring, or structures of one to four non-fused five-membered heteroaromatic rings. Methods of tricyanovinylating heteroaromatic ring structures to form nonlinear optical materials are also disclosed. Polymers having the disclosed nonlinear optical materials as pendant side chains, which polymers exhibit second order nonlinear optical properties, and base polymers having pendant fused ring structures devoid of nonlinear optical properties that exhibit second order nonlinear optical properties after the covalent attachment of tricyanovinyl groups to the pendant side chains are disclosed. Methods of tricyanovinglating the pendant side chains of the base polymers are also disclosed.

Obturateur stratique de lumière destiné à être utilisé dans un appareil de mesure du temps

Procédé de fabrication de cristaux de niobate de lithium

Lithium niobate crystals with elevated pha

Single crystal lethium niobate with a phase matching temp. >90 degrees C is grown from a melt contg. (1 +y) moles Li2O- per mole Nb2O5, where y=0.05 to 0.3. The crystal is esp. suited for harmonic generation of visible coherent radiation from fundamental radiation of lambda =1.06 mu, at a temp. where radiation-caused optical damage does not effect operation.

Nichtlineare Einrichtung mit einem kristallinen Körper der einen für elektromagnetische Strahlung durchlässigen Einkristall aufweist

Procédé pour la production du second harmonique à partir d'une radiation fondamentale de 1,06 u de longueur d'onde

Manufacturing method for electrooptic element and optical deflector including electrooptic element

An electrooptic element includes an optical waveguide layer made from a ferroelectric material and having a polarization inverted region of a predetermined shape having an optical incidence face and an optical exit face, and an upper electrode layer and a lower electrode layer formed on a top face and a bottom face of the optical waveguide layer, respectively, in which the ferroelectric material is magnesium-oxide-doped lithium niobate, and at least one of the optical incidence face and the optical exit face of the optical waveguide layer is formed in parallel with a crystal face of the ferroelectric material.

Laser based frequency standards and their applications

Frequency standards based on mode-locked fiber lasers, fiber amplifiers and fiber-based ultra-broad bandwidth light sources, and applications of the same.

Light conversion module and light source system including the same

A light conversion module includes a coupler for combining two light beams to form a combined light beam, a nonlinear crystal arranged to receive the combined light beam and configured to include a plurality of poling regions for performing successive nonlinear frequency mixing processes, a first optical device configured to focus the combined light beam onto the nonlinear crystal, a first moving stage carrying the nonlinear crystal and moving the nonlinear crystal for an adjustment of a focus position of the combined light beam on the nonlinear crystal, and an optical detector configured for measuring a power level of the light beam from the nonlinear crystal for the adjustment of the focus position of the combined light beam on the nonlinear crystal.

BNA CRYSTAL

An object of the present invention is to produce a non-conventional high-quality BNA single crystal. Another object of the present invention is to provide a process for producing the above-described high-quality BNA single crystal. Specifically, the present invention provides a BNA crystal characterized by having a half-value width of diffraction peak X-ray intensity of 100 seconds or less in a rocking curve measurement by X-ray diffraction method. 1. A BNA crystal having a half-value width of diffraction peak X-ray intensity of 100 seconds or less in a rocking curve measurement by X-ray diffraction method.2. The BNA crystal according to claim 1 , which has been produced by the solution method.3. The BNA crystal according to claim 2 , having a long side of 5 mm or more claim 2 , a short side of 5 mm or more claim 2 , and a thickness of 0.5 mm or more.4. A process for producing a BNA crystal by the solution method claim 2 , comprising the step of obtaining a seed crystal and the step of growing crystal in which the obtained seed crystal is grown in a solution claim 2 ,wherein, in the step of growing crystal, said seed crystal is held by a crystal holding part and held at an end in the main growth direction of the seed crystal by said holding part; andthe solution used in the step of growing crystal is a supernatant solution after precipitation of the seed crystal in the step of obtaining a seed crystal.5. The process for producing a BNA crystal according to claim 4 , wherein the crystal is precipitated and grown by slowly cooling the solution in the step of obtaining a seed crystal and/or the step of growing crystal.6. The BNA crystal according to claim 1 , having a long side of 5 mm or more claim 1 , a short side of 5 mm or more claim 1 , and a thickness of 0.5 mm or more. The present invention relates to a crystal of N-benzyl-2-methyl-4-nitroaniline (hereinafter also referred to as BNA) which is an organic nonlinear optical crystal, and a process for producing the ...

Optical parametric generator based on a slant-stripe periodically poled nonlinear material with optimized lateral output coupling of a terahertz signal

An optical parametric device comprising a slant-stripe periodically poled nonlinear material that is operable to generate signal in response to interaction with a pump wave, the non-linear interaction being such that the pump and idler waves are collinear and the signal wave is non-collinear relative to the pump and idler waves, wherein the slant-stripe non-linear material is able to generate two idler waves and two signal waves, and the device is adapted to allow for the selection and output coupling of a required one of the two signal waves.

NONLINEAR OPTICAL CdSiP2 CRYSTAL FOR USE IN SURGICAL LASER

CdSiPcrystals with sizes and optical quality suitable for use as nonlinear optical devices are disclosed, as well as NLO devices based thereupon. A method of growing the crystals by directional solidification from a stoichiometric melt is also disclosed. The disclosed NLO crystals have a higher nonlinear coefficient than prior art crystals that can be pumped by solid state lasers, and are particularly useful for frequency shifting 1.06 μm, 1.55 μm, and 2 μm lasers to wavelengths between 2 μm and 10 μm. Due to the high thermal conductivity and low losses of the claimed CdSiPcrystals, average output power can exceed 10 W without severe thermal lensing. A 6.45 μm laser source for use as a medical laser scalpel is also disclosed, in which a CdSiPcrystal is configured for non-critical phase matching, pumped by a 1064 nm Nd:YAG laser, and temperature-tuned to produce output at 6.45 μm. 1. A nonlinear optical device comprising a negative uniaxial II-IV-Vcrystal belonging to the space point group 42 m and having nlo properties , whereby at least one incident beam of electromagnetic radiation can be directed into said crystal so as to generate electromagnetic radiation emerging from said crystal that includes at least one output wavelength different from the wavelengths of all incident beams of radiation , and wherein said crystal is a single crystal of CdSiP.220-. (canceled)21. A method for producing CdSiPcrystals comprising the steps of:(a) vacuum sealing cadmium (Cd), silicon (Si), and phosphorous (P) in an ampoule in a molar ratio of approximately Cd:Si:P=1:1:2, not including any excess quantities added so as to account for a vapor phase above a melt, the Cd and Si being physically mixed at a first end of the ampoule and the P being located at a second end of the ampoule;{'sub': 2', '2, '(b) heating the ampoule so that the Cd and the Si are maintained at a hot zone temperature at least near the melting point of CdSiPwhile the P is maintained at a cold zone temperature ...

NONLINEAR OPTICAL CdSiP2 CRYSTAL FOR USE IN SURGICAL LASER

CdSiP 2 crystals with sizes and optical quality suitable for use as nonlinear optical devices are disclosed, as well as NLO devices based thereupon. A method of growing the crystals by directional solidification from a stoichiometric melt is also disclosed. The disclosed NLO crystals have a higher nonlinear coefficient than prior art crystals that can be pumped by solid state lasers, and are particularly useful for frequency shifting 1.06 μm, 1.55 μm, and 2 μm lasers to wavelengths between 2 μm and 10 μm. Due to the high thermal conductivity and low losses of the claimed CdSiP 2 crystals, average output power can exceed 10 W without severe thermal lensing. A 6.45 μm laser source for use as a medical laser scalpel is also disclosed, in which a CdSiP 2 crystal is configured for non-critical phase matching, pumped by a 1064 nm Nd:YAG laser, and temperature-tuned to produce output at 6.45 μm.

Method and Apparatus for Quantum Mechanical Entanglement Protection

Embodiments of the present invention provide systems and methods to robustly inter-convert between polarization-entangled photon pairs and time-entangled photon pairs, such that produced polarization-entangled photons pairs can be converted into time-entangled photon pairs, stored as time-entangled photon pairs to preserve the entanglement for longer periods of time, and then converted back to polarization-entangled photon pairs when ready for manipulation, processing, and measurement by a quantum application. 1. A system , comprising:a first module configured to receive a polarization-entangled photon pair, the polarization-entangled photon pair comprising time-coincident first and second photons having first and second polarizations respectively, and to produce time-separated first and second photons having the first and second polarizations respectively; anda second module configured to receive the time-separated first and second photons and to adjust at least one of the first polarization of the first photon and the second polarization of the second photon to produce a time-entangled photon pair, the time-entangled photon pair comprising time-shifted first and second photons each having a third polarization.2. The system of claim 1 , wherein the first module comprises:a first polarizing beam splitter (PBS) configured to receive and split the time-coincident first and second photons;a first path, coupled to the first PBS, configured to receive the first photon of the time-coincident first and second photons;a second path, coupled to the first PBS, configured to receive the second photon of the time-coincident first and second photons; anda second PBS, coupled to the first and second paths, configured to combine the first and second photons to produce the time-separated first and second photons.3. The system of claim 2 , wherein the first and second paths have first and second lengths respectively claim 2 , and wherein the first length is shorter than the second ...

WAVELENGTH CONVERSION CRYSTAL, AND A LIGHT SOURCE COMPRISING THE SAME

A nonlinear crystal includes a plurality of poled zones implemented in a nonlinear material. The crystal has a first region and a second region. In the first region, the local average of a length of a period of the poled zones substantially increases with increasing distance from an origin. In the second region, the local average of the length of the period of the poled zones substantially decreases with increasing distance from the origin. The origin is located at an end of the crystal. 123-. (canceled)24. A crystal for wavelength conversion , comprising:a plurality of poled zones, wherein the crystal has a first region and a second region such that:in the first region, a local average of a length of a period of the poled zones substantially increases with increasing distance from an origin, andin the second region, the local average of the length of the period of the poled zones substantially decreases with increasing distance from the origin, andwherein the origin is located at an end of said crystal.25. The crystal according to claim 24 , further comprising:a third region such that:the second region is located between the first region and the third region, andin the third region, the local average of the length of the period of the poled zones substantially increases with increasing distance from said origin.26. The crystal according to claim 24 , wherein the length of the first region is greater than or equal to 5% of a total length of the crystal claim 24 , and wherein the length of the second region is greater than or equal to 5% of the total length of the crystal.27. The crystal according to claim 24 , wherein the lengths of the periods of the poled zones at different locations have been selected such that the width of a conversion efficiency curve at 80% of the maximum conversion efficiency value is greater than or equal to 0.3 nm.28. The crystal according to claim 24 , wherein a ratio of a width Δλ80% of the conversion efficiency function to a width ΔλFWHM ...

Low power electro-optic modulator

An electro-optic modulator includes a substrate, a pair of transmission lines, a first strip-shaped electrode, and a pair of second strip-shaped electrodes. The substrate includes a surface and a reversely-polarized portion. The transmission lines are formed in the surface and extend substantially in parallel with each other. One of the transmission lines is formed within the reversely-polarized portion and the other is out of the reversely-polarized portion. The first strip-shaped electrode is formed on the surface and covers the transmission lines. The second strip-shaped electrodes are positioned at two sides of the first strip-shaped electrodes and parallel with the first strip-shaped electrode.

OPTICAL COUPLING DEVICE HAVING KBBF GROUP CRYSTAL COUPLED WITH PRISMS AND METHOD FOR MANUFACTURING SAME

The present invention relates to a KBBF family nonlinear optical crystal-prism coupler and its method of fabrication. The coupler comprises: a KBBF family crystal with two smooth surfaces; transition layers each of which is deposited on respective one of the two smooth surfaces of the KBBF family crystal; and a pair of prisms each of which optically contacts with respective one of the activated transition layers. The present invention further provides a KBBF family nonlinear optical crystal-prism coupler that comprises: a KBBF family crystal with two smooth surfaces; a pair of prisms each of which has a smooth surfaces; first transition layers each of which is deposited on respective one of the two smooth surfaces of the KBBF family crystal; and second transition layers each of which is deposited on a smooth surface of respective one of the pair of prisms, wherein the first and second transition layers are integral by optical contact. The coupling between the KBBF family crystal and the prisms is achieved by optical contact through transition layers to improve bonding strength. 1. A KBBF family nonlinear optical crystal-prism coupler , comprising:a KBBF family crystal with two smooth surfaces;transition layers each of which is deposited on respective one of the two smooth surfaces of the KBBF family crystal; andtwo prisms each of which optically contacts with respective one of the activated transition layers, whereinthe transition layers are in thickness of 200 nm-1000 nm, and the materials of the transition layers and the prisms can be identical or different;the smooth surfaces of the KBBF family crystal are crystallographic c-plane;each of the smooth surfaces of the KBBF family crystal has a roughness of Ra less than 0.5 nm and a surface flatness less than ⅛λ (λ=632.8 nm); andthe KBBF family crystal is a single KBBF family crystal or a combination of several layers of KBBF family crystals, which are combined by optically contact through the transition layers, the ...

NON-LINEAR OPTICAL CRYSTAL WITH ANTI-REFLECTIVE NANOSTRUCTURED SURFACE

A non-linear optical crystal, such as a Lithium triborate (LiBOor LBO) crystal, includes a first nanostructured optical surface including distributed pillars and gaps having random heights and cross sections to provide anti-reflection control and scatter control of first light incident on the first structured optical surface. The LBO crystal has an anti-reflective random structured optical surface formed by selective substitution of the surface species Boron-pentoxide (BO) by Lithium Fluoride (LiF), resulting in a depletion layer with low reflectivity and low reflective scatter in the visible, ultraviolet (UV), and near infrared (IR) bands. The LBO crystal with the anti-reflective structured optical surface may be a monolithic structure and thus need not include a coating of an anti-reflective (AR) material, although the LBO crystal may include an optical surface coated by an AR material. The pillars and gaps may be randomly distributed or periodically distributed on the optical surface. 1. A non-linear optical crystal , comprising:a first structured optical surface including distributed pillars and gaps having heights and cross sections to provide anti-reflection control and scatter control of first light incident on the first structured optical surface; anda second optical surface.2. The non-linear optical crystal of claim 1 , wherein the second optical surface comprises a second structured optical surface including distributed pillars and gaps having heights and cross sections to provide anti-reflection control and scatter control of second light incident on the second structured optical surface.3. The non-linear optical crystal of claim 2 , wherein the pillars and gaps are randomly distributed on the first structured optical surface and the second structured optical surface claim 2 , and wherein pillars and gaps have random heights and random cross sections.4. The non-linear optical crystal of claim 2 , wherein the pillars and gaps distributed on the first ...

POINT-WISE PHASE MATCHING FOR NONLINEAR FREQUENCY GENERATION IN DIELECTRIC RESONATORS

An optical resonator fabricated from a uniaxial birefringent crystal, such as beta barium borate. The crystal is cut with the optical axis not perpendicular to a face of the cut crystal. In some cases the optical axis lies in the plane of the cut crystal face. An incident (input) electromagnetic signal (which can range from the infrared through the visible to the ultraviolet) is applied to the resonator. An output signal is recovered which has a frequency that is an integer multiple of the frequency of the input signal. In some cases a prism is used to evanescently couple the input and the output signals to the resonator. 1. An optical resonator , comprising:{'sub': 1', '2, 'claim-text': {'br': None, 'i': f', '=N×f, 'sub': 2', '1}, 'a birefringent crystal having an optical axis, said birefringent crystal cut so that said optical axis is disposed at an angle different from 0 degrees relative to a direction perpendicular to a cut face of said birefringent crystal, said birefringent crystal having a circular circumference defined about said cut face so as to provide a whispering gallery mode of optical propagation in said birefringent crystal, said birefringent crystal configured to receive an input electromagnetic signal having a first frequency fand configured to provide in response to said input electromagnetic signal an output electromagnetic signal having a second frequency f, said first frequency and said second frequency being related according to the relation'}where N is an integer greater than 1.2. The optical resonator of claim 1 , wherein said birefringent crystal is beta barium borate.3. The optical resonator of claim 1 , wherein said optical axis is disposed at an angle of 90 degrees relative to a direction perpendicular to a cut face of said birefringent crystal.4. The optical resonator of claim 1 , wherein said input electromagnetic signal is a TE mode electromagnetic signal.5. The optical resonator of claim 1 , wherein said output electromagnetic signal ...

POWER-SCALABLE NONLINEAR OPTICAL WAVELENGTH CONVERTER

A system includes a nonlinear crystal positioned such that a focus of a laser beam is outside the nonlinear crystal in at least one plane perpendicular to a beam propagation direction of the laser beam. The nonlinear crystal is disposed in a crystal mount assembly. A laser beam may be directed at the nonlinear crystal for wavelength conversion. The system may be used as a deep-UV wavelength converter. 1. A system comprising:a laser source configured to generate a laser beam;a nonlinear crystal configured for wavelength conversion, wherein the nonlinear crystal is positioned such that a focus of the laser beam is outside the nonlinear crystal in at least one plane perpendicular to a beam propagation direction of the laser beam; anda crystal mount assembly, wherein the nonlinear crystal is disposed on the crystal mount assembly.2. The system of claim 1 , further comprising beam shaping optics disposed between the laser source and the nonlinear crystal and disposed downstream of the nonlinear crystal in the beam propagation direction.3. The system of claim 1 , wherein the crystal mount assembly is configured to adjust a beam size of the laser beam in the nonlinear crystal by adjusting a distance between a center of the nonlinear crystal and the focus.4. The system of claim 1 , wherein the crystal mount assembly includes a plurality of mounting features at different distances from the laser source claim 1 , wherein the crystal mount assembly is configured to be disposed on one of the mounting features claim 1 , and wherein a beam size of the laser beam in the nonlinear crystal is provided by selecting one of the mounting features.5. The system of claim 4 , wherein the nonlinear crystal is positioned such that the focus of the laser beam is outside the nonlinear crystal in the at least one plane perpendicular to the beam propagation direction of the laser beam with a Rayleigh range configured such that time averaged fundamental optical power density or harmonic optical ...

COMPONENT SHIFTING APPARATUS WITH SHAPE MEMORY ALLOY ACTUATORS

Systems and methods for shifting a position of one or more optical elements are disclosed. In embodiment, a system may include a housing having a chamber formed therein, at least one non-linear crystal disposed in the chamber, the non-linear crystal configured to receive at least one incident signal and to convert a wavelength of at least a portion of the incident signal, and at least one shape memory alloy element disposed such that thermal or electrical energy applied to the shape memory alloy causes movement of the non-linear crystal. 1. A system comprising:a housing having a chamber formed therein;at least one optical element disposed in the chamber, the optical element configured to receive at least one incident signal and to convert a wavelength of at least a portion of the incident signal; andat least one shape memory alloy element disposed such that thermal or electrical energy applied to the shape memory alloy causes movement of the optical element.2. The system of claim 1 , wherein the housing is a crystal oven configured to control a thermal environment of the optical element.3. The system of claim 1 , wherein the shape memory alloy element has a cuboid or coil shape.4. The system of claim 1 , further comprising at least one biasing element disposed between the optical element and a wall defining at least a portion of the chamber.5. The system of claim 1 , further comprising at least one sensor configured to measure a temperature in in or adjacent the chamber.6. The system of claim 1 , further comprising at least one biasing device disposed between the optical element and a portion of the housing claim 1 , wherein the biasing device is coupled to the shape memory alloy element to effect mechanical communication between the shape memory alloy element and the optical element.7. The system of claim 1 , further comprising a positioning body disposed adjacent the chamber claim 1 , wherein the shape memory alloy element abuts a portion of the positioning body.8 ...

SINGLE PHOTONS SOURCE AND KEY DISTRIBUTION

A method of key distribution, a key distribution system, a single photon source system and a method of generating single photons. The method of key distribution comprises the steps of: providing a free space optics, FSO, link between a transmitter and a receiver; detecting whether an eavesdropper is present along the FSO link; transmitting individual photons or weak coherent pulses, as an approximation of individual photons, each encoding a basic unit of the key according to a binary or higher number base system from the transmitter to the receiver; and comparing timing information associated with the transmission and reception of the individual photons for determining the key when it is detected that no eavesdropper is present along the FSO link. 1. A method of key distribution comprising the steps of:providing a free space optics, FSO, link between a transmitter and a receiver;detecting whether an eavesdropper is present along the FSO link;transmitting individual photons or weak coherent pulses, as an approximation of individual photons, each encoding a basic unit of the key according to a binary or higher number base system from the transmitter to the receiver; andcomparing timing information associated with the transmission and reception of the individual photons for determining the key when it is detected that no eavesdropper is present along the FSO link.2. The method of claim 1 , wherein transmitting the individual photons comprises generating a mixture of photon pairs encoding different basic units claim 1 , respectively claim 1 , using Spontaneous Parametric Downconversion claim 1 , SPDC.4. (canceled)5. The method of claim 1 , comprising generating single photons using one or more solid state single photon emitters claim 1 , and/or wherein each photon encodes the basic unit of the key as a wavelength state.6. The method of claim 1 , comprising using a decoy state system to mitigate an eavesdropper harvesting the quantum signals that have been scattered by ...

GENERATING OPTICAL PULSES VIA A SOLITON STATE OF AN OPTICAL MICRORESONATOR

A light pulse source (), being adapted for generating repetitive optical pulses, comprises a continuous wave (cw) laser () being arranged for providing cw laser light, an optical microresonator () being made of a resonator material, which has a third order (Kerr) nonlinearity and an anomalous resonator dispersion, wherein the cw laser () is arranged for coupling the cw laser light into the optical microresonator (), which, at a predetermined relative detuning of the cw laser () and the optical microresonator (), is capable of including a light field in a soliton state, wherein soliton shaped pulses can be coupled out of the optical microresonator () for providing the repetitive optical pulses, and a tuning device () being arranged for creating and maintaining the predetermined relative detuning of the cw laser () and the optical microresonator () based on a tuning time profile being selected in dependency on a thermal time constant of the optical microresonator () such that the soliton state is achieved in a thermal equilibrium state of the optical microresonator (). Furthermore, a method of generating repetitive optical pulses is described based on soliton shaped pulses coupled out of an optical microresonator () is described. 1. A light use source adapted for generating repetitive optical pulses , comprising:a continuous wave (cw) laser arranged for providing cw laser light,an optical microresonator comprising a resonator material, which has a third order (Kerr) nonlinearity and an anomalous resonator dispersion, wherein the cw laser is arranged for coupling the cw laser light into the optical microresonator, which, at a predetermined relative detuning of the cw laser and the optical microresonator, is capable of including a light field in a soliton state, wherein soliton shaped pulses can be coupled out of the optical microresonator for providing the repetitive optical pulses, anda tuning device arranged for creating and maintaining the predetermined relative ...

SECOND HARMONIC GENERATION

A second harmonic generator may include a combiner to combine a fundamental optical beam with a residual fundamental optical beam. The second harmonic generator may include a second harmonic crystal, coupled to the combiner, to generate a second harmonic optical beam from the fundamental optical beam and the residual fundamental optical beam. Upon generation of the second harmonic optical beam, the residual fundamental optical beam may exit the second harmonic crystal. 1. A second harmonic generator , comprising:a combiner to combine a fundamental optical beam with a residual fundamental optical beam; and 'wherein, upon generation of the second harmonic optical beam, the residual fundamental optical beam is to exit the second harmonic crystal.', 'a second harmonic crystal, coupled to the combiner, to generate a second harmonic optical beam from the fundamental optical beam and the residual fundamental optical beam,'}2. The second harmonic generator of claim 1 , wherein the fundamental optical beam is in a first polarization and the residual fundamental optical beam is in a second polarization claim 1 ,wherein the second polarization is orthogonal to the first polarization, andwherein the second harmonic crystal is to perform Type-II phase matching.3. The second harmonic generator of claim 1 , wherein the fundamental optical beam is in a first polarization and the residual fundamental optical beam is in a second polarization claim 1 ,wherein the second polarization is orthogonal to the first polarization, andwherein the combiner is a polarizing combiner to combine the fundamental optical beam and the residual fundamental optical beam.4. The second harmonic generator of claim 1 , wherein the fundamental optical beam is to be incident on an input optical face of the second harmonic crystal at a first angle claim 1 , and the residual fundamental optical beam is to be incident on the input optical face of the second harmonic crystal at a second angle claim 1 ,wherein the ...

LASER DEVICE

In a laser device, a different refractive index region B of a photonic crystal layer is arranged at a lattice point position of a square lattice. In the case where a plane shape of the different refractive index regions B is a nearly isosceles right triangle, two sides forming a right angle extend along longitudinal and horizontal lateral lines of the square lattice. A direction parallel to or vertical to an oblique side of the triangle and a direction of polarization in the periodic polarization inversion structure of a nonlinear optical crystal NL are the same.

Apparatus for beam-dividing using acousto-optic modulators

An apparatus for temporally dividing pulses from a train of optical pulses into angularly-separated beam paths is disclosed. The apparatus includes no more than one acousto-optic modulator (AOM) for each beam path. The AOMs are configured and arranged to maximize the angular separation of the beam paths and to maximize the energy of each divided pulse. Pulses on the separated beam paths have equal pulse energies and may be gated independently.

Systems And Methods For Efficient Optical Frequency Conversion With Integrated Optical Systems

Various embodiments of the present technology provide a novel architecture for optical frequency conversion in a waveguide which can be applied to any suitable nonlinear waveguide material and any wavelength. In accordance with some embodiments, phase-matched bends can be used to increase the nonlinear interaction length. For example, the device can begin with a straight waveguide section with a width designed for phase-matching. When the straight waveguide section approaches the end of the chip, a bending waveguide section allows the waveguide to meander back in the opposite direction. Various embodiments of the bend can have a wider or narrower width to eliminate phase-matching for second harmonic generation (SHG) and instead provide a 2π phase-shift between the pump and signal light. Therefore, at the end of the bend, the pump and signal light are in-phase and a phase-matched width will continue the SHG process. 1. A waveguide comprising: 'wherein within the first section the pump light and the signal light are phase matched; and', 'a first section to receive pump light that generates a signal light throughout the waveguide,'} wherein the second section is formed with a phase matched bend; and', 'wherein the second section has a phase mismatch with the first section such that the phase output of the second section matches the phase of the input to the second section., 'a second section connected to the first section,'}2. The waveguide of claim 1 , wherein the phase matched bend has a π/2 angle to create either a π or 2π phase-shift between the pump and the signal light depending on a sign-change of a second order nonlinear susceptibility at the π/2 angle.3. The waveguide of claim 1 , wherein the phase matched bend has a π angle to create either a π or 2π phase-shift between the pump and the signal light.4. The waveguide of claim 1 , wherein the second section includes non-phase-matched waveguide geometry to introduce a desired phase shift.5. The waveguide of ...

Terahertz Wave Generating Device and Spectroscopic Device Using Same

A terahertz wave generating device according to the present invention comprises a fixed-wavelength pump optical laser that generates a single wavelength pump beam, a variable-wavelength laser that emits a seed beam and is capable of making the wavelength of the seed beam variable, a delay element that delays pulses of the pump beam and a first non-linear crystal that generates terahertz waves by receiving the seed beam, a first pump beam that is not delayed by the delay element and a second pump beam that is delayed by the delay element. 120.-. (canceled)21. A terahertz wave generating device comprising:a fixed-wavelength pump optical laser that generates a single wavelength pump beam;a variable-wavelength laser that emits a seed beam and is capable of making the wavelength of the seed beam variable;a delay element that delays pulses of the pump beam;a first non-linear crystal that generates terahertz waves by receiving the seed beam, a first pump beam that is not delayed by the delay element, and a second pump beam that is delayed by the delay element; anda control portion which controls the wavelength of the seed beam output from the variable-wavelength laser in accordance with the time by which the second pump beam is delayed by the delay element.22. The terahertz wave generating device according to claim 21 ,wherein a frequency of the seed beam output from the variable-wavelength laser non-linearly changes with respect to the time.23. The terahertz wave generating device according to claim 21 ,wherein an interval of pulses of an associated wave of the first pump beam and the second pump beam is a non-equal interval.24. The terahertz wave generating device according to claim 21 ,wherein a period of the first pump beam is two times or longer a pulse width of the first pump beam.25. The terahertz wave generating device according to claim 24 ,wherein time by which the second pump beam is delayed by the delay element is shorter than a half of the period of the first ...

COMMON-PATH NONCOLLINEAR OPTICAL PARAMETRIC AMPLIFIER

Systems and methods for providing a noncollinear optical parametric amplifier (NOPA). Two approaches for classes of NOPA are described: phase-mask NOPA and Wollaston NOPA. 1. An optical parametric amplifier comprising:a light source;a phase-stable optical splitter configured to receive light from the light source and split the received light into a first beam and a second beam;first beam optics in optical communication with the phase-stable optical splitter for receiving the first beam;second beam optics in optical communication with the phase-stable optical splitter for receiving the second beam; andcommon path reflective elements positioned relative to the first beam optics and the second beam optics for receiving and redirecting light from the first beam optics and the second beam optics.2. The optical parametric amplifier of wherein the phase-stable optical splitter comprises a phase-mask.3. The optical parametric amplifier of wherein the phase-stable optical splitter comprise a Wollaston prism.4. The optical parametric amplifier of claim 1 , further comprising a first cylindrical lens and a second cylindrical lens with the phase mask disposed there between.5. The optical parametric amplifier of claim 4 , wherein the first beam optics comprise a half-wave plate and polarizer claim 4 , a first beta Barium Borate crystal claim 4 , a blue-pass filter claim 4 , a compensation glass and a wedge pair.6. The optical parametric amplifier of claim 5 , wherein the second beam optics comprise a half-wave plate and polarizer claim 5 , a first spherical lens claim 5 , a sapphire claim 5 , and a second spherical lens.7. The optical parametric amplifier of claim 6 , wherein the common path reflective elements comprise a spherical mirror and a pick-off mirror.8. The optical parametric amplifier of claim 7 , further comprising a barium borate crystal optically downstream from the common path reflective elements.9. The optical parametric amplifier of claim 3 , wherein the first ...

LIGHT DETECTION AND RANGING (LIDAR) SYSTEM USING A WAVELENGTH CONVERTER

Embodiments of the disclosure provide an apparatus for emitting laser light and a system and method for detecting laser light returned from an object. The system includes a transmitter and a receiver. The transmitter includes one or more laser sources, at least one of the laser sources configured to provide a respective native laser beam having a wavelength above 1,100 nm. The transmitter also includes a wavelength converter configured to receive the native laser beams provided by the laser sources and convert the native laser beams into a converted laser beam having a wavelength below 1,100 nm. The transmitter further includes a scanner configured to emit the converted laser beam to the object in a first direction. The receiver is configured to detect a returned laser beam having a wavelength below 1,100 nm and returned from the object in a second direction. 1. An optical sensing system , comprising: a first laser source configured to provide a first laser beam having a first wavelength above 1,100 nm;', 'a second laser source configured to provide a second laser beam having a second wavelength different than the first wavelength;', 'a wavelength converter configured to convert the first laser beam and the second laser beam into a converted laser beam having a third wavelength below 1,100 nm; and', 'a scanner configured to steer the converted laser beam towards an environment in a first direction; and, 'a transmitter, comprising 'wherein the first laser source and the second laser source are separate.', 'detect a returned laser beam having a fourth wavelength below 1,100 nm returned from the environment in a second direction,'}, 'a receiver configured to2. The optical sensing system of claim 1 , wherein one of the first laser source or the second laser source is a fiber laser.3. The optical sensing system of claim 2 , wherein both the first laser source and the second laser source are fiber lasers.4. The optical sensing system of claim 1 , wherein the receiver ...

PRODUCTION OF WAVEGUIDES MADE OF MATERIALS FROM THE KTP FAMILY

The invention relates to a method for producing waveguides () from a material () of the KTP family comprising the following method steps: 18-. (canceled)9. Method for producing waveguides from a material of the KTP family comprising:b) treating the material in such a way that a periodic poling of the material is achieved, characterized in that the molten salt bath which contains rubidium ions in c) satisfies the following boundary conditions:', {'sub': '3', 'the mole fraction of rubidium nitrate (RbNO) in the melt lies in the range of 86-90 mol % at the beginning of the treatment,'}, {'sub': '3', 'the mole fraction of potassium nitrate (KNO) in the melt lies in the range of 10-12 mol % at the beginning of the treatment,'}, {'sub': 3', '2, 'the mole fraction of barium nitrate (Ba(NO)) in the melt lies in the range of 0.5-1 mol % at the beginning of the treatment,'}, 'the temperature of the melt lies in the range of 357−363° C. during the treatment., 'c), treating the material in a molten salt bath, which contains rubidium ions,'}10. Method according to claim 9 , characterized in that the method is carried out in the sequence b) claim 9 , c).11. Method according to claim 9 , characterized in that the method has an upstream a) preparatory treating the material claim 9 , in order to homogenize or to reduce the conductivity of the material.12. Method according to claim 11 , characterized in that the preparatory treatment includes a treatment of the material in a KNO3 melt.13. Method according to claim 9 , characterized in that the treatment claim 9 , which leads to a periodic poling claim 9 , includes a use of a pulsed electric field between two electrodes claim 9 , which are applied on mutually opposite sides of the material sample.14. Method according to claim 13 , characterized in that a periodically-shaped electrode is thereby used on one side of the material sample.15. Method according to claim 9 , characterized in that the treatment in the molten salt bath claim 9 ...

Method and Setup to Generate Terahertz Radiation Scalable in Energy

A pump beam () is pre-tilted by subjecting the pump beam to pulse-front-tilting, the thus obtained tilted-pulse-front pump beam is then coupled into the nonlinear optical medium. THz radiation is generated in the optical medium by nonlinear optical processes, in particular by optical rectification, by the pump beam. A pulse-front-tilt of the pump beam satisfying the velocity matching condition of vcos(γ)=vis induced as a sum of a plurality of pulse-front-tilts separately induced as a partial pulse-front-tilt of the pump beam in subsequent steps. The last step of pulse-front-tilting of the pump beam is performed by coupling the pump beam into the nonlinear optical medium through a stair-step structure () formed in an entry surface () of the nonlinear optical medium which forms an angle (Γ) of a given non-zero size with an exit surface () of said nonlinear optical medium. 16050. A method to generate terahertz radiation () in a nonlinear optical medium () , the method comprising:{'b': '12', 'pre-tilting a pump beam () by subjecting the pump beam to pulse-front-tilting to create a tilted-pulse-front pump beam;'}coupling the tilted-pulse-front pump beam into the nonlinear optical medium through a stair step structure; andgenerating THz radiation in the optical medium by nonlinear optical processes using the pump beam,{'sub': p,cs', 'THz,f', 'p;cs', 'THz;f, 'b': '12', 'inducing pulse-front-tilt of the pump beam to satisfy a velocity matching condition of vcos(γ)=vas a sum of a plurality of pulse-front-tilts induced separately as a partial pulse-front-tilt of the pump beam in subsequent steps, where vis group velocity of the pump beam, vis phase velocity of the THz pulse, and γ is an angle formed between a pulse front and a phase front of said pump beam (),'}{'b': 51', '52, "wherein the nonlinear optical medium comprises an entry surface () and an exit surface () bounding the nonlinear optical medium in the pump beam's propagation direction and forming an angle (Γ) of a ...

Non-linear Optical Device with a Broadened Gain Bandwidth

An optical crystal for converting an input light beam, the crystal having an ingress surface, an egress surface, and a fan-out grating has a fan-out pattern oriented at an offset angle θ in the range of 1° to 45° with respect to a beam entry plane at a beam ingress location. 1. An optical crystal for converting an input light beam comprising:an ingress surface;an egress surface; anda fan-out grating comprising a fan-out pattern with a fan-out pattern orientation line oriented at an offset angle θ in the range of 1° to 45° with respect to a beam entry plane at a beam ingress location on the ingress surface.2. The optical crystal of claim 1 , wherein the ingress surface and egress surfaces are substantially planar.3. The optical crystal of claim 2 , wherein the egress surface is substantially parallel to the ingress surface.4. The optical crystal of claim 1 , wherein the optical crystal is used for a type of non-linear frequency conversion selected from one of the group consisting of second-harmonic-generation claim 1 , sum-frequency-generation claim 1 , difference-frequency-generation claim 1 , optical-parametric-generation claim 1 , and optical-parametric-oscillation.5. The optical crystal of claim 1 , wherein the fan-out pattern further comprises a deliberate phase-shift and/or a missing poled domains.6. A device comprising the optical crystal of claim 4 , wherein an emission is tunable in wavelength and has a linewidth greater than 100 GHz.7. An optical crystal for converting an input light beam comprising:an ingress surface;an egress surface; anda fan-out grating, further comprising a temperature gradient and/or an electro-optic-effect of the refractive index along the direction of beam propagation.8. An optical crystal for converting an input light beam comprising:a fan-out grating comprising a fan-out pattern; anda cylindrical exterior wall wherein an axis of the cylindrical exterior wall is substantially normal to the fan-out pattern,wherein the cylindrical ...

HIGH POWER LASER CONVERTER BASED ON PATTERNED SRB4B07 OR PBB407 CRYSTAL

The disclosed laser system is configured with a laser source outputting light at a fundamental frequency. The output light is incident on a frequency converter operative to convert the fundamental frequency to a higher harmonic including at least one frequency converting stage. The frequency converter is based on a SrBO(SBO) or PbBO(PBO) nonlinear crystal configured with a plurality of domains. The domains have periodically alternating polarity of the crystal axis enabling a QPM use and formed with each with highly parallel walls which deviate from one another less than 1 micron over a 10 mm distance.

LIGHT DETECTION AND RANGING (LIDAR) SYSTEM USING A WAVELENGTH CONVERTER

Embodiments of the disclosure provide an apparatus for emitting laser light and a system and method for detecting laser light returned from an object. The system includes a transmitter and a receiver. The transmitter includes one or more laser sources, at least one of the laser sources configured to provide a respective native laser beam having a wavelength above 1,100 nm. The transmitter also includes a wavelength converter configured to receive the native laser beams provided by the laser sources and convert the native laser beams into a converted laser beam having a wavelength below 1,100 nm. The transmitter further includes a scanner configured to emit the converted laser beam to the object in a first direction. The receiver is configured to detect a returned laser beam having a wavelength below 1,100 nm and returned from the object in a second direction. 1. A system for detecting laser light returned from an object , comprising: one or more laser sources, at least one of the laser sources configured to provide a respective native laser beam having a wavelength above 1,100 nm;', 'a wavelength converter configured to receive the native laser beams provided by the laser sources and convert the native laser beams into a converted laser beam having a wavelength below 1,100 nm; and', 'a scanner configured to emit the converted laser beam to the object in a first direction; and, 'a transmitter comprisinga receiver configured to detect a returned laser beam having a wavelength below 1,100 nm and returned from the object in a second direction.2. The system of claim 1 , wherein at least one of the laser sources is a fiber laser.3. The system of claim 2 , wherein each of the laser sources is a fiber laser.4. The system of claim 1 , wherein the receiver includes a silicon-based photodetector.5. The system of claim 1 , wherein the wavelength converter comprises:a nonlinear optical material configured to perform optical frequency mixing of the native laser beams; anda ...

Organic Thin-Film Quantum Sources

A photon source for generating entangled photons includes a pump laser, and 4-N, N-dimethylamino-4′-N′-methyl-stilbazolium-tosylate (DAST) crystals, the pump laser pumping the DAST crystals with pump photons to generate a stream of pairs of entangled photons, each pair comprising a signal photon and an idler photon.

WAVELENGTH CONVERSION ELEMENT AND WAVELENGTH CONVERSION LIGHT PULSE WAVEFORM SHAPING DEVICE

A wavelength conversion element includes a crystal having a periodically poled structure in which polarization is inverted with an inversion period Λ along a z-axis which is an input axis of a light pulse. The wavelength conversion element is configured to generate an output light pulse converted to have an output frequency f(x) corresponding to the inversion period Λ(x) at each position x by change of the inversion period Λ according to the position x, and when a target frequency linearly changing with the position x is set to f(x)=b+ax, a frequency width of the output frequency is set to δf(x), and the output frequency is set to f(x)=f(x)+α(x), the output frequency is set to coincide with the target frequency within a range satisfying a condition |α(x)|≦δf(x). 1. A wavelength conversion element comprising:a crystal having a periodically poled structure in which polarization is inverted with a predetermined inversion period Λ along a second axis, with respect to a first axis and the second axis perpendicular to the first axis serving as an input axis of an input light pulse of a wavelength conversion object, whereinthe wavelength conversion element is configured to generate an output light pulse converted to have an output frequency f(x) corresponding to the inversion period Λ(x) at each position x by change of the inversion period Λ according to the position x along the first axis, and{'sub': T', 'T', 'T, 'when a target frequency linearly changing with the position x is set to f(x)=b|ax (where a and b are constants), a frequency width of the output frequency at the position x is set to δf(x), and the output frequency is set to f(x)=f(x)+α(x), the output frequency f(x) is set to coincide with the target frequency f(x) within a range satisfying a condition |α(x)|≦δf(x).'}3. The wavelength conversion element according to claim 1 , wherein the frequency width δf(x) of the output frequency is a width when an intensity in a frequency spectrum of the output light pulse ...

POWER-SCALABLE NONLINEAR OPTICAL WAVELENGTH CONVERTER

A system includes a nonlinear crystal positioned such that a focus of a laser beam is outside the nonlinear crystal in at least one plane perpendicular to a beam propagation direction of the laser beam. The nonlinear crystal is disposed in a crystal mount assembly. A laser beam may be directed at the nonlinear crystal for wavelength conversion. The system may be used as a deep-UV wavelength converter. 1. A method comprising:generating a laser beam;directing the laser beam at a nonlinear crystal configured for wavelength conversion, wherein the nonlinear crystal is positioned such that a focus of the laser beam is outside the nonlinear crystal in at least one plane perpendicular to a beam propagation direction of the laser beam, wherein the nonlinear crystal is disposed on a crystal mount assembly, and wherein the crystal mount assembly provides an angle stability of greater than 0% and less than or equal to 27% of an angular acceptance range during operation; andnonlinearly converting the laser beam from a first wavelength to a second wavelength with the nonlinear crystal.2. The method of claim 1 , wherein the nonlinearly converting is one of second harmonic generation claim 1 , sum-frequency generation claim 1 , or difference frequency generation.3. The method of claim 1 , further comprising directing the laser beam through beam shaping optics disposed between a laser source and the nonlinear crystal and disposed downstream of the nonlinear crystal in the beam propagation direction.4. The method of claim 1 , further comprising adjusting a beam size of the laser beam in the nonlinear crystal with the crystal mount assembly by adjusting a distance between a center of the nonlinear crystal and the focus.5. The method of claim 1 , wherein the nonlinear crystal is positioned such that the focus of the laser beam is outside the nonlinear crystal in the at least one plane perpendicular to the beam propagation direction of the laser beam with a Rayleigh range configured ...

Methods and Apparatus for Generating Mid-Infrared Frequency Combs

Apparatus and methods for generating mid-IR frequency combs using intra-pulse DFG. A mode-locked pulse generation laser generates near-IR pulses which are amplified. The amplified pulses are spectrally broadened by a nonlinear element, for example a normal dispersion highly nonlinear fiber (ND-HNLF) to generate broadened pulses. The nonlinear spectral broadening element is a transparent dielectric material having a cubic nonlinear response. Broadened pulses are temporally compressed to generate short, high-power pulses which few-cycle conditioned pulses which are ready for the intrapulse DFG process. The DFG block generates a mid-IR comb by difference frequency generation. It might comprise an orientation patterned GaP (OP-GaP) crystal or a poled lithium niobate (PPLN) crystal. 1. Apparatus for generating a mid-IR frequency comb comprising:An oscillator configured to generate near-IR mode-locked light pulses, the pulses having a duration under 500 fsec;A normal dispersion broadening element for receiving the near-IR pulses and generating nonlinearly spectral broadened pulses;An anomolous dispersion compression element for receiving the nonlinearly spectral broadened pulses and forming few-cycle, temporally compressed, conditioned pulses;A comb generating element for receiving the conditioned pulses and generating a first mid-IR frequency comb by intrapulse difference frequency generation.2. The apparatus of wherein the oscillator is a Er:fiber laser3. The apparatus of wherein the broadening element comprises a normal dispersion highly nonlinear fiber.4. The apparatus of wherein the compression element comprises anomalous dispersion fused silica.5. The apparatus of wherein the compression element comprises anomalous dispersion fused silica wedges.6. The apparatus of wherein the compression element comprises anomalous dispersion dielectric chirped mirrors.7. The apparatus of wherein the comb generating element comprises a poled lithium niobate crystal.8. The apparatus ...

INTEGRATED ELECTRO-OPTIC FREQUENCY COMB GENERATOR

An integrated electro-optic frequency comb generator based on ultralow loss integrated, e.g. thin-film lithium niobate, platform, which enables low power consumption comb generation spanning over a wider range of optical frequencies. The comb generator includes an intensity modulator, and at least one phase modulator, which provides a powerful technique to generate a broad high power comb, without using an optical resonator. A compact integrated electro-optic modulator based frequency comb generator, provides the benefits of integrated, e.g. lithium niobate, platform including low waveguide loss, high electro-optic modulation efficiency, small bending radius and flexible microwave design. 1. An optical device comprising:a substrate;a device layer on the substrate; anda plurality of waveguide-based, electro-optic modulators connected in series by a waveguide structure in the device layer.2. The optical device according to claim 1 , wherein the plurality of electro-optic modulators are configured to receive light from at least one continuous wave light source claim 1 , and generate a plurality of optical frequencies claim 1 , said optical device comprising a frequency comb generator.3. The optical device according to claim 2 , wherein the waveguide structure is continuous.4. The optical device according to claim 2 , wherein the waveguide structure is comprised of an electro-optic material with an electro-optic constant >10 pm/V.5. The optical device according to claim 2 , wherein the waveguide structure is comprised of Lithium Niobate or Lithium Tantalate.6. The optical device according to claim 4 , wherein the waveguide structure includes electro-optic sections claim 4 , and connecting sections;wherein each electro-optic modulator includes an RF signal electrode adjacent to one of the electro-optic sections for employing electro-optic non-linearity of the waveguide structure in the electro-optic sections; andwherein each electro-optic modulator is interconnected by ...

Polar Oxysulfide for Nonlinear Optical Applications

Single crystals of a new noncentrosymmetric polar oxysulfide SrZnSO (s.g. Pmn) grown in a eutectic KF—KCl flux with unusual wurtzite-like slabs consisting of close-packed corrugated double layers of ZnSO tetrahedra vertically separated from each other by Sr atoms and methods of making same.

Efficient Spectrum-Spanning Terahertz Frequency Synthesis via Dielectric Structure with Nonlinear Medium

It remains a challenge to generate coherent radiation in the spectral range of 0.1-10 THz (“the THz gap”), a band for applications ranging from spectroscopy to security and high-speed wireless communications. Here, we disclose how to produce coherent radiation spanning the THz gap using efficient second-harmonic generation (SHG) in low-loss dielectric structures, starting from an electronic oscillator (EO) that generates coherent radiation at frequencies of about 100 GHz. The EO is coupled to cascaded, hybrid THz-band dielectric cavities that combine (1) extreme field concentration in high-quality-factor resonators with (2) nonlinear materials enhanced by phonon resonances. These cavities convert the input radiation into higher-frequency coherent radiation at conversion efficiencies of >103%/W, making it possible to bridge the THz gap with 1 W of input power. This approach enables efficient, cascaded parametric frequency converters, representing a new generation of light sources extensible into the mid-IR spectrum and beyond.

OPTICAL APPARATUS AND METHOD FOR OUTPUTTING ONE OR MORE PHOTONS

There is presented an optical apparatus comprising first and second photon pair sources configured to convert at least one pump light photon into a first and second correlated signal and idler photon pairs. In one example, the apparatus is configured to use one of the signal and idler photons from the first correlated photon pair for controlling the conversion of the pump light photon in the second photon pair source. The apparatus may configured such that, at least one of the signal and idler photons from the first correlated photon pair is output from the first photon pair source onto an optical path wherein at least one of the signal and idler photons from the second correlated photon pair is output from the second photon pair source onto the optical path. A method is also provided for outputting one or more photons using the optical apparatus. 1. An optical apparatus comprising:a first photon pair source configured to convert at least one pump light photon into a first correlated signal and idler photon pair; anda second photon pair source configured to convert at least one further pump light photon into a second correlated signal and idler photon pair,wherein the apparatus is configured to use a signal or idler photons from the first correlated photon pair for controlling the conversion of the at least one further pump light photon.2. An optical apparatus as claimed in claim 1 , wherein the apparatus is configured such that:at least one of the signal or the idler photons from the first correlated photon pair is output from the first photon pair source onto an optical path; andat least one of the signal or the idler photons from the second correlated photon pair is output from the second photon pair source onto the said optical path.3. An optical apparatus as claimed in claim 2 , wherein at least part of the second photon pair source is disposed along the optical path.4. An optical apparatus as claimed in claim 2 , wherein the second photon pair source is ...

OPTICAL ELEMENT AND METHOD OF PRODUCING OPTICAL ELEMENT

[Problem to Be Solved] The present invention provides an optical element including a coating film in which the occurrence of cracks is prevented. 1. An optical element comprising:an optical crystal; andan antireflection film coating a surface of the optical crystal; wherein the antireflection film contains an organic compound.2. The optical element according to claim 1 , wherein an absolute value of a difference in linear expansion coefficient between the antireflection film and the optical crystal is 130 ppm/K or less.3. The optical element according to claim 1 , wherein the antneflection film has a Young's modulus at 25° C. of 10 GPa or less.4. The optical element according to claim 1 , wherein the organic compound contains claim 1 , as a structural unit claim 1 , at least one compound selected from the group consisting of: a compound containing a cyclic structure to which a fluorine atom is bound; and a compound containing a cyclic olefin structure.5. The optical element according to claim 1 , wherein the optical crystal is an organic optical crystal.6. The optical element according to claim 5 , wherein the organic optical crystal is an organic nonlinear optical crystal.7. The optical element according to claim 6 , wherein the organic nonlinear optical crystal is a RAST (4-dimethylamino-N-methyl-4-stilbazolium tosylate) crystal claim 6 , a DASC (4-dimethylamino-N-methyl-4-stilbazolium-p-chlorobenzene sulfonate) crystal claim 6 , a DSTMS (4-N claim 6 ,N-dimethylamino-4′-N′-methylstilbazolium-2 claim 6 ,4 claim 6 ,6-trimethylbenzenesulfonate) crystal claim 6 , an OHI (2-(3-(4-hydroxystyryl)-5 claim 6 ,5-dimethylcyclohex-2-enylidene)malononitrile) crystal claim 6 , a BDAS-TP (bis(4-dimethylamino-N-methyl-4-stilbazolium)terephthalate) crystal claim 6 , a DAS-HTP (4-dimethylamino-N-methyl-4-stilbazolium hydrogen terephthalate) crystal claim 6 , a BNA (N-benzyl2-methyl-4-nitroaniline) crystal claim 6 , an HMQ-TMS ((2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium-2 ...

DEVICE AND METHOD FOR CONVERTING A LIGHT AND A LASER SYSTEM

Disclosed herein is a device () for converting a light () received thereby. The device () comprises a resonating structure () comprising a Raman medium. The resonating structure is arranged to resonate Raman light () generated by a Raman interaction between the Raman medium and the light () when so received. 1. A device for converting a light received thereby , the device comprising a resonating structure comprising a Raman medium having a thermal conductivity of greater than 2 W/K/m , the resonating structure being arranged to resonate Raman light generated by a Raman interaction between the Raman medium and the light when so received , the resonating structure being arranged to lose less than 5% of the resonating Raman light's energy in a resonance cycle period of the resonating structure.2. A device defined by wherein the Raman medium has a thermal conductivity greater than 5 W/m/K.38-. (canceled)9. A device defined by wherein the Raman medium has at least one of absorption and scattering losses that reduce the resonating Raman light's power by less than 2% when passed therethrough.1016-. (canceled)17. A device defined by comprising a plurality of spaced apart reflecting surfaces.1819-. (canceled)20. A device defined by wherein the Raman medium is crystalline and comprises at least one element of Group IV of the periodic table.2122-. (canceled)23. A device defined by wherein the Raman medium comprises diamond.24. (canceled)25. A device defined by arranged for a polarisation vector of the light to be aligned with a <111> axis of the diamond.26. A device defined by wherein the Raman medium comprises at least one of a tungstate crystal claim 1 , molybdate and a vanadate crystal.2728-. (canceled)29. A device defined by wherein the light has an average power greater than 10 W.3036-. (canceled)37. A device defined by wherein the resonating structure has a second order nonlinear medium arranged for interacting with at least one of the light and the Raman light to ...

NONLINEAR OPTICAL DEVICE MANUFACTURED WITH 4H SILICON CARBIDE CRYSTAL

Provided is a nonlinear optical device manufactured with 4H silicon carbide crystal. The nonlinear optical crystal may be configured to alter at least a light beam () at a frequency to generate at least a light beam () at a further frequency different from the frequency. The nonlinear optical crystal comprises a 4H silicon carbide crystal (). The nonlinear optical device is more compatible with practical applications in terms of outputting mid-infrared laser at high power and high quality and thus are more applicable in practice, because the 4H silicon carbide crystal has a relatively high laser induced damage threshold, a relatively broad transmissive band (0.38-5.9 μm and 6.6-7.08 μm), a relatively great 2-order nonlinear optical coefficient (d=6.7 pm/V), a relatively great birefringence, a high thermal conductivity (490 WmK), and a high chemical stability. 1. A nonlinear optical device , comprising:{'b': 12', '16, 'at least a nonlinear optical crystal configured to alter at least a light beam () at a frequency to generate at least a light beam () at a further frequency different from the frequency,'}{'b': '13', 'wherein the nonlinear optical crystal comprises a 4H silicon carbide crystal ().'}213. The nonlinear optical device according to claim 1 , wherein the 4H silicon carbide crystal () has a space group of P6mc claim 1 , where each crystal cell includes four carbon/silicon atom layers arranged in ABCB.313. The nonlinear optical device according to claim 1 , wherein the 4H silicon carbide crystal () has a transmittance greater than 10% in a wavelength range of 0.38-5.5 μm and 6.7-6.9 μm.413. The nonlinear optical device according to claim 1 , wherein the 4H silicon carbide crystal () is configured to achieve Type II phase matching for nonlinear optical frequency conversion.513. The nonlinear optical device according to claim 1 , wherein the 4H silicon carbide crystal () is configured to achieve critical phase matching for nonlinear optical frequency conversion ...

STABLE DIFFERENCE FREQUENCY GENERATION USING FIBER LASERS

Systems and methods for stabilizing mid-infrared light generated by difference frequency mixing may include a mode locked Er fiber laser that generates pulses, which are split into a pump arm and a wavelength shifting, signal arm. Pump arm pulses are amplified in Er doped fiber. Shifting arm pulses are amplified in Er doped fiber and shifted to longer wavelengths in Raman-shifting fiber or highly nonlinear fiber, where they may be further amplified by Tm doped fiber, and then optionally further wavelength shifted. Pulses from the two arms can be combined in a nonlinear crystal such as orientation-patterned gallium phosphide, producing a mid-infrared difference frequency, as well as nonlinear combinations (e.g., sum frequency) having near infrared and visible wavelengths. Optical power stabilization can be achieved using two wavelength ranges with spectral filtering and multiple detectors acquiring information for feedback control. Controlled fiber bending can be used to stabilize optical power. 1) An optical source comprising:a pulsed laser configured to produce signal light in a signal arm and pump light in a pump arm, said pump arm and said signal arm each disposed downstream from said pulsed laser, said signal light comprising optical pulses having a signal frequency and said pump light comprising optical pulses having a pump frequency;a nonlinear crystal configured to receive said pump light and said signal light and to produce frequency converted light at one or both of a difference frequency or a sum frequency of said pump frequency and said signal frequency;a photodetector that detects light that is related to a relative time delay between optical pulses from said pump arm and optical pulses from said signal arm;a time delay control device configured to control said relative time delay; anda feedback circuit configured to use information from said photodetector to control said time delay control device to improve stability of said frequency converted light ...

HIGH-SPEED REAL-TIME SAMPLING AND MEASURING DEVICE AND METHOD FOR MID-INFRARED ULTRAFAST LIGHT SIGNAL

A device for high-speed real-time sampling of mid-infrared ultrafast light signals includes a time domain amplification unit and a detection unit. The time domain amplification unit is used to perform sampling and time domain amplification on signal light incident to the time domain amplification unit, and convert the signal light of a mid-infrared band into a near-infrared/visible band. The detection unit is used to receive and record information of the to-be-detected signal light processed by the time domain amplification unit to realize high-speed real-time sampling and measurement of the mid-infrared ultrafast light signal. The present disclosure can accurately obtain subpicosecond transient characteristics of the light signal, breaks through the capacity limit to the response rate of a traditional photoelectric detector, the bandwidth of the oscilloscope and the like, and is applicable to femtosecond-level mid-infrared ultrafast light signals. 12030. A high-speed real-time sampling and measuring device for a mid-infrared ultrafast light signal , comprising a time domain amplification unit () and a detection unit () ,{'b': 20', '1, 'wherein the time domain amplification unit () is configured to perform sampling and time domain amplification on received to-be-detected signal light (), and convert signal light of a mid-infrared band into a near-infrared/visible band;'}{'b': 30', '1', '20, 'the detection unit () is configured to receive and record information of the to-be-detected signal light () processed by the time domain amplification unit ().'}220999. The high-speed real-time sampling and measuring device for the mid-infrared ultrafast light signal according to claim 1 , wherein the time domain amplification unit () comprises a beam combiner () claim 1 , a signal light path and a pump light path which are respectively located in two incident light paths of the beam combiner () claim 1 , and a new frequency light path located in an emergent light path of the ...

BROADBAND RADIATION GENERATION IN HOLLOW-CORE FIBERS

Radiation source assemblies and methods for generating broadened radiation by spectral broadening. A radiation source assembly includes a pump source configured to emit modulated pump radiation at one or more wavelengths. The assembly further has an optical fiber configured to receive the modulated pump radiation emitted by the pump source, the optical fiber including a hollow core extending along at least part of a length of the fiber. The hollow core is configured to guide the received radiation during propagation through the fiber. The radiation emitted by the pump source includes first radiation at a pump wavelength, and the pump source is configured to modulate the first radiation for stimulating spectral broadening in the optical fiber.

MULTIPHOTONIC MICROSCOPY METHOD AND DEVICE

The invention relates to a device comprising: 1. A device comprising:{'sub': '1', 'a laser source emitting a first beam with a central wavelength λlying between 1010 nm and 1050 nm,'}{'sub': '2', 'a spectral supercontinuum generator downstream of the laser source, generating a second beam with a central wavelength λlying between 1670 nm and 1730 nm from a part of the first beam,'}{'sub': '3', 'an optical parametric amplification system downstream of the spectral supercontinuum generator, generating a third beam with a central wavelength λlying between 2540 nm and 2690 nm from at least a part of the second beam and a part of the first beam, and'}{'sub': '4', 'a second harmonic generator downstream of the optical parametric amplification system, the second harmonic generator generating a fourth beam with a central wavelength λlying between 1270 nm and 1345 nm from at least a part of the third beam.'}2. The device as claimed in claim 1 , the first beam having a central wavelength λlying between 1020 nm and 1040 nm.3. The device as claimed in claim 1 , the second beam having a central wavelength λlying between 1695 nm and 1710 nm.4. The device as claimed in claim 1 , the third beam having a central wavelength λlying between 2590 nm and 2620 nm.5. The device as claimed in claim 1 , the fourth beam having a central wavelength λlying between 1295 nm and 1310 nm.6. The device as claimed in claim 1 , the first beam being composed of pulse trains of a duration less than or equal to 500 fs.7. The device as claimed in claim 1 , the laser source being an ytterbium-doped fiber laser claim 1 , the first beam presenting pulses of a duration less than or equal to 400 fs and presenting an energy per pulse greater than 40 μJ.8. The device as claimed in claim 1 , the spectral supercontinuum generator being a fiber with nonlinear effect or claim 1 , better claim 1 , a YAG crystal.9. The device as claimed in claim 1 , the optical parametric amplification system comprising at least one ...

WAVELENGTH CONVERSION APPARATUS AND WAVELENGTH CONVERSION METHOD

A wavelength conversion apparatus and a wavelength conversion method that can stably output wavelength converted light for a long time are provided. A wavelength conversion apparatus according to an aspect of the present disclosure includes a casing , a wavelength conversion element disposed inside the casing and configured to convert a wavelength of incident light and output light with the converted wavelength, a first port that introduces a first gas containing 99.9% or more of a nitrogen gas inside the casing , and a second port that introduces a second gas containing 1% or more of an oxygen gas. 1. A wavelength conversion apparatus comprising:a casing;a wavelength conversion element disposed inside the casing and configured to convert a wavelength of incident light and output light with the converted wavelength; andgas supply means for introducing, into an internal space of the casing, a gas in which a ratio of an oxygen gas to a nitrogen gas falls within a range of 1/9999 to 1/99.2. The wavelength conversion apparatus according to claim 1 , wherein the casing comprises:a first port that introduces a first gas containing 99.9% or more of a nitrogen gas; anda second port that introduces a second gas containing 1% or more of an oxygen gas.3. The wavelength conversion apparatus according to claim 2 , wherein the second gas is dry air.4. A wavelength conversion apparatus comprising:a casing;a wavelength conversion element disposed inside the casing and configured to convert a wavelength of incident light and output light with the converted wavelength;a first port that introduces a first gas containing 99.9% or more of a nitrogen gas into an internal space of the casing; anda second port that introduces a second gas containing 1% or more of an oxygen gas.5. The wavelength conversion apparatus according to claim 2 , wherein an ejection opening for the second gas is provided closer to the wavelength conversion element than an ejection opening for the first gas.6. The ...

GENERATION OF CONTINUOUS WAVE DUV LASER RADIATION

A method for generating continuous wave laser radiation in the deep ultraviolet (DUV) spectral range includes the steps of: generating first laser radiation in the ultraviolet spectral range between 205 nm and 265 nm at a first power level, wherein the generation of the first laser radiation involves not more than two frequency conversion steps; generating second laser radiation in the infrared spectral range at a wavelength of more than 900 nm at a second power level; and sum frequency mixing the first and second laser radiation for generating the laser radiation in the deep ultraviolet spectral range below 205 nm. Moreover, a laser system generates continuous wave laser radiation in the DUV spectral range. According to a preferred embodiment, the DUV laser radiation is tunable in wavelength. 1. A method for generating continuous wave laser radiation in the deep ultraviolet spectral range , comprising the steps of:{'b': 11', '11, 'generating first laser radiation () in the ultraviolet spectral range between 205 nm and 265 nm at a first power level, wherein the generation of the first laser radiation () involves not more than two frequency conversion steps;'}{'b': '13', 'generating second laser radiation () in the infrared spectral range at a wavelength of more than 900 nm at a second power level; and'}{'b': 11', '13, 'sum frequency mixing the first and second laser radiation (, ) for generating the laser radiation in the deep ultraviolet spectral range below 205 nm;'}wherein the ratio of the second power level to the first power level is between 10 and 2000; and{'b': 11', '13, 'wherein the sum frequency mixing step of the first and second laser radiation (, ) is non-resonant.'}2. The method of claim 1 , wherein the ratio of the second power level to the first power level is between 100 and 1000.3. The method of claim 1 , wherein the first power level is in the range between 10 mW and 1000 mW.4. The method of claim 1 , wherein the second power level is in the range ...

LASER BEAM OUTPUT APPARATUS

According to the present invention, a pulsed laser output section outputs a laser beam having a predetermined wavelength as first pulses. An optical path determining section receives the first pulses and determines one or more among two or more optical paths for each of the first pulses for output. A wavelength changing section receives light beams travelling, respectively, through the two or more optical paths and, when the power of the traveling light beams exceeds a threshold value, changes the light beams to have their respective different wavelengths for output. A multiplexer multiplexes outputs from the wavelength changing section. The optical path determining section allows for change in the power ratio between a first power of the light beam traveling through one of two among the two or more optical paths and a second power of the light beam traveling through the other of the two optical paths. 1. A laser beam output apparatus comprising:a pulsed laser output section that outputs a laser beam having a predetermined wavelength as first pulses;an optical path determining section that receives the first pulses and determines one or more among two or more optical paths for each of the first pulses for output;a wavelength changing section that receives light beams travelling, respectively, through the two or more optical paths and, when the power of the traveling light beams exceeds a threshold value, changes the light beams to have their respective different wavelengths for output; anda multiplexer that multiplexes outputs from the wavelength changing section, whereinthe optical path determining section is arranged to allow for change in the power ratio between a first power of the light beam traveling through one of two among the two or more optical paths and a second power of the light beam traveling through the other of the two optical paths.2. A laser beam output apparatus comprising:a pulsed laser output section that outputs a laser beam having a ...

OPTICAL PARAMETRIC DEVICE BASED ON RANDOM PHASE MATCHING IN POLYCRYSTALLINE MEDIUM

An optical parametric device (OPD), which is selected from an optical parametric oscillator (OPO) or optical parametric generator (OPG), is configured with a nonlinear optical element (NOE) which converts an incoupled pump radiation at first frequency into output signal and idler radiations at one second frequency or different second frequencies, which is/are lower than the first frequency, by utilizing nonlinear interaction via a random quasi-phase matching process (RQPM-NOE). The NOE is made from a nonlinear optical material selected from optical ceramics, polycrystals, micro and nanocrystals, colloids of micro and nanocrystals, and composites of micro and nanocrystals in polymer or glassy matrices. The nonlinear optical material is prepared by modifying a microstructure of the initial sample of the NOE such that an average grain size is of the order of a coherence length of the three-wave interaction which enables the three wave nonlinear interaction with a highest parametric gain achievable via the RQPM process 1. An optical parametric device (OPD) selected from an optical parametric oscillator (OPO) or optical parametric generator (OPG) and comprising a nonlinear optical element (NOE) configured to convert an incoupled pump radiation at first frequency into output signal and idler radiations at at least one second frequency , which is lower than the first frequency , by utilizing nonlinear interaction via a random quasi-phase matching process (RQPM-NOE).2. The OPD of further comprising a laser pump outputting the pump radiation at the first frequency and operating in a continuous wave (CW) regime or pulsed regime with a nanosecond claim 1 , (ns) picosecond (ps) or femtosecond (fs) pulse duration.30. The OPD of claim or 2 , wherein the pump laser is a mode-locked laser outputting fs and ps pulses.4. The OPD of or 2 , wherein the pump laser is configured to generate an optical frequency comb.5. The OPD of the above claims 2 , wherein the NOE is synchronously ...

183 nm CW Laser and Inspection System

A laser assembly generates continuous wave (CW) laser output light in the range of approximately 181 nm to approximately 185 nm by generating fourth harmonic light from first fundamental CW light having a first fundamental wavelength between 1 μm and 1.1 μm, generating fifth harmonic light by mixing the fourth harmonic light with the first fundamental CW light, and then mixing the fifth harmonic light with second fundamental or signal CW light having a second wavelength between 1.26 μm and 1.82 μm. The fifth harmonic light is generated using an external cavity that circulates first fundamental CW light through a first nonlinear crystal, and by directing the fourth harmonic light through the first nonlinear crystal. The laser output light is generated using a second cavity that passes circulated second fundamental or signal CW light through a second nonlinear crystal, and directing the fifth harmonic light through the second nonlinear crystal. 1. An inspection system comprising:a laser assembly configured to generate continuous wave (CW) laser output light having a wavelength in the range of approximately 181 nm to approximately 185 nm;first optics configured to direct the laser output light from the laser assembly to an article being inspected;second optics configured to collect an image information portion of said laser output light affected by the article being inspected, and to direct the image information portion to one or more detectors, a first fundamental CW laser configured to generate a first fundamental CW light having a first fundamental frequency with a corresponding first fundamental wavelength between about 1 μm and 1.1 μm;', 'a fourth harmonic generation module coupled to receive a first portion of the first fundamental CW light, and configured to generate a fourth harmonic light having a fourth harmonic frequency equal to four times the first fundamental frequency;', 'a fifth harmonic generation module coupled to receive a second portion of the first ...

Multi-crystal frequency tripler for third harmonic conversion

An optical system includes a laser source operable to output a laser beam at a fundamental wavelength and a frequency conversion system. The frequency conversion system includes a frequency doubler module including a first plurality of nonlinear optical crystals and a frequency polarization tripler module including a second plurality of nonlinear optical crystals. The optical system also includes a control system coupled to the frequency conversion system and a diagnostics system coupled to the frequency conversion system.

SINGLE PASS LASER AMPLIFIER WITH PULSED PUMPING

Systems and methods for spectrally broadening seed pulses with a single pass laser amplifier are disclosed. A bulk TM:II-VI polycrystalline material with combined gain and nonlinear characteristic provides passive (cold) spectral broadening of high power seed pulses. Continuous pumping provides more significant spectral broadening. In particular, pulsed pumping of TM:II-VI polycrystalline material (e.g. Cr2+:ZnS, Cr2+:ZnSe, and Cr2+:CdSe) is shown to provide significant spectral broadening to the super continuum generation SCG level. Pulse picking, pump sources, master oscillators and various optical components are described. 1. A short-pulse , single-pass , amplifier based laser system with a spectrally broadened laser output , the system comprising:a seed laser; anda pulse-pumped single-pass laser amplifier configured to emit an amplified, spectrally broadened laser output;wherein the seed laser is configured to emit a train of ultrafast mid-IR seed pulses;wherein the laser amplifier is configured to receive and amplify the energy of at least one seed pulse;wherein the laser amplifier comprises a nonlinear optical medium characterized by a critical power for self-focusing; andwherein the nonlinear optical medium is irradiated in the single-pass laser amplifier above the critical power for self-focusing, whereby the laser output is spectrally broadened.2. The laser system as in claim 1 , wherein the nonlinear optical medium has a combination of laser gain and nonlinear optical properties.3. The system as in claim 1 , further comprising a pulse picker disposed between the seed laser and the laser amplifier claim 1 , the pulse picker configured to select at least one seed pulse that is synchronized with a pump pulse for amplification.4. The laser system as in claim 1 , wherein laser gain in the laser amplifier provides amplified pulse power; and wherein the amplified pulse power exceeds the critical power for self-focusing in the nonlinear medium.5. The laser system ...

SYSTEM AND METHOD FOR GENERATING MID-INFRARED OPTICAL FREQUENCY COMB BASED ON LITHIUM NIOBATE MICROCAVITY

A system for generating a mid-infrared optical frequency comb based on a lithium niobate microcavity includes pumping units, a beam combining unit, a nonlinear frequency conversion unit and a filtering unit. The pumping units are divided into two paths and are configured to provide two paths of pumping light. The beam combining unit is configured to perform beam combination on the two paths of pumping light The nonlinear frequency conversion unit is configured to receive the beam-combined pumping light and undergo a nonlinear four-wave mixing process to generate a broadband optical frequency comb at a mid-infrared waveband. The filtering unit is configured to filter the remaining pumping light and output a mid-infrared optical frequency comb. 1. A system for generating a mid-infrared optical frequency comb based on a lithium niobate microcavity , comprising: pumping units , a beam combining unit , a nonlinear frequency conversion unit and a filtering unit;the pumping units being divided into two paths and being configured to provide two paths of pumping light;the beam combining unit being configured to perform beam combination on the two paths of pumping light;the nonlinear frequency conversion unit being configured to receive the beam-combined pumping light and undergo a nonlinear four-wave mixing process to generate a broadband optical frequency comb at a mid-infrared waveband; andthe filtering unit being configured to filter the remaining pumping light and output a mid-infrared optical frequency comb.2124. The system for generating the mid-infrared optical frequency comb based on the lithium niobate microcavity according to claim 1 , wherein each pump unit path comprises a narrow linewidth tunable continuous laser source () claim 1 , a power amplifier () and a polarization controller ();{'b': 1', '2', '4, 'the narrow linewidth tunable continuous laser source () is configured to emit continuous signal light; the power amplifier () is configured to amplify the ...

NONLINEAR OPTICAL CRYSTAL WITH CORRECTED PHASE MATCHING ANGLE

A nonlinear optical crystal (NLO) with a phase matching angle that is corrected with a source laser beam for harmonic conversion. The source laser only has to be within a wavelength range depending on the dispersion of the crystal while the crystal is tilted to the calculated expected conversion angle of the source laser as reference. The angle correction is accomplished with a parallel kinematic motion device to which a nonlinear crystal is mounted on a platform, to determine the wavelength- and temperature-specific angle with active laser alignment and subsequent precision resurfacing. The invented phase matching angle correction is applicable to any uniaxial and biaxial NLO crystals in a wide range of wavelengths, e.g., from far ultraviolet to visible to far infrared. It is of most value for NLO crystals of large walk-off and is applicable to any prior art frequency converting architectures. 1. A nonlinear optical (NLO) crystal slab , with two opposing polished crystal faces , where its phase matching angle is corrected to ±0.02° , produced with the aid of a source laser where the wavelength of said source laser second harmonic frequency doubles at the intended custom laser phase matching angle.2. Using according to a source laser selected from mid-infrared claim 1 , near-infrared and visible radiation to correct the phase matching angle of a NLO crystal for harmonic frequency conversion.3. Correcting the phase matching angle according to of a NLO crystal selected from KTP (KTiPO) claim 1 , LiBO claim 1 , KNbO claim 1 , CsBO claim 1 , BiBO claim 1 , CsTiOAsO claim 1 , RbTiOAsO. ZGP (ZnGeP2) claim 1 , β-BaBO claim 1 , CsLiBO claim 1 , LiNbO claim 1 , MgO:LiNbO claim 1 , AgGaS claim 1 , and AgGaSefor harmonic frequency conversion.4. Inserting a phase-angle corrected single NLO crystal according to into a beam path at 0° angle of incidence into a laser system claim 1 , obviating the need for any tilt angle alignment or output optimization.5. Combining two or more ...

GENERATOR OF AT LEAST THREE COHERENT LASER BEAMS IN THE INFRARED AND VISIBLE DOMAIN

According to a first aspect, the invention relates to a generator of at least three coherent laser beams at least one beam of which is in the infrared domain and at least one beam of which is in the visible domain, comprising: an elementary source for emitting a first continuous-wave laser beam, at a first given infrared wavelength; a nonlinear crystal frequency doubler, allowing, from a first beam sampled from the first laser beam at the first wavelength, a second laser beam to be generated at a second wavelength; and a nonlinear crystal sum frequency generator, allowing, from a second beam sampled from the first laser beam at the first wavelength and from the second laser beam at the second wavelength, a third laser beam to be generated at a third wavelength. 1. A generator of laser beams in the infrared and in the visible domains , comprising:an elementary source for the emission of a continuous laser beam, at a first wavelength in the infrared domain;an optical amplifier for the amplification of the continuous laser beam providing an amplified laser beam at the first wavelength;a beam splitter allowing to split the amplified laser beam into a first laser beam at the first wavelength and a second laser beam at the first wavelength;a nonlinear frequency-doubling crystal, allowing a laser beam at a second wavelength to be generated on the basis of the first laser beam at the first wavelength, wherein the second wavelength is in the visible domain;a nonlinear frequency-sum-generating crystal, allowing a laser beam at a third wavelength to be generated on the basis of the second laser beam at the first wavelength and of the laser beam at the second wavelength, wherein the third wavelength is in the visible domain; andwherein the laser beam at the second wavelength, the laser beam at the third wavelength and the amplified laser beam at the first wavelength exhibit a fixed phase relation.2. The generator of laser beams according to claim 1 , furthermore comprising ...

Nonlinear Optical Material and Methods of Fabrication

Disclosed is a nonlinear optical material (NLO) for use in deep-UV applications, and methods of fabrication thereof. The NLO is fabricated from a plurality of components according to the formula ABCand a crystallographic non-centrosymmetric (NCS) structure. The NLO material may be fabricated as a polycrystalline or a single crystal material. In an embodiment, the material may be according to a formula BaZnBPO. 1. A device comprising:{'sub': q', 'y', 'z, 'a nonlinear optical material (NLO) according to the formula ABCand having a crystallographic non-centrosymmetric (NCS) structure.'}2. The device of claim 1 , wherein A comprises at least one of an alkali metal or an alkaline earth metal.3. The device of claim 1 , wherein B comprises at least two of boron (B) claim 1 , carbon (C) claim 1 , or a transition metal.4. The device of claim 3 , wherein C comprises at least one of oxygen (O) claim 3 , phosphorous (P) claim 3 , or fluorine (F).5. The device of claim 1 , wherein q and y are each from about 1 to about 10.6. The device of claim 1 , wherein z is from about 1 to about 20.7. The device of claim 1 , wherein the NLO material is according to a composition BaZnBPO.8. The device of claim 1 , wherein the NLO material is a polycrystalline material.9. The device of claim 1 , wherein the NLO material is a single crystal.10. The device of wherein the NLO material does not comprise beryllium.11. The device of claim 1 , wherein an SHG of the NLO material at 532 nm is from about 20 a.u. to about 30 a.u.12. The device of claim 11 , wherein a particle size of the NLO material is from about m to about 130 μm.13. The device of claim 1 , wherein an SHG of the NLO material at 1064 nm is from about 42 a.u. to about 110 a.u.14. The device of claim 13 , wherein a particle size of the NLO material is from about m to about 130 μm.15. A method of fabricating polycrystalline non-linear optical materials comprising:heating a vessel containing a plurality of components according to a protocol ...

QUINOLINIUM SINGLE CRYSTALS FOR USE IN NONLINEAR OPTICS

The present invention relates to quinolinium-derived single crystals for use in nonlinear optics, which exhibit high molecular orientation and macroscopic optical nonlinearity. When the quinolinium-derived crystals according to the present invention are applied to THz wave light sources, higher THz wave generating efficiency may be obtained as compared with inorganic crystals or existing organic M crystals. 2. The quinolinium derivative of claim 1 , wherein the quinolinium derivative is selected from among 2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 4-methylbenzenesulfonate (HMQ-T) claim 1 , 2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 4-methoxylbenzenesulfonate (HMQ-MBS) claim 1 ,2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium naphthalenesulfonate (HMQ-NS) claim 1 ,2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 2 claim 1 ,4 claim 1 ,6-trimethylbenzenesulfonate (HMQ-TMS) claim 1 , and 2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 6-hydroxy naphthalenesulfonate (HMQ-HNS).3. An optical rectification (OR) or difference frequency generation (DFG) method using a crystal comprising the quinolinium derivative represented by Chemical Formula 1 or 2 as above.4. A teraherz wave generated using the optical rectification (OR) or difference frequency generation (DFG) method of . This application is a Bypass-Continuation Application of PCT Application No. PCT/KR2012/006991, filed on Aug. 31, 2012, which claims priority to Korean Patent Application No. 10-2011-0087771, filed on Aug. 31, 2011, in the Korean Intellectual Property Office, the entire disclosures of which is incorporated herein by reference for all purposes.The present invention relates to quinolinium derivative single crystals for use in nonlinear optics (or electro-optics) so as for terahertz wave applications, and particularly to a quinolinium derivative for use in nonlinear optics with high orientation and large macroscopic optical nonlinearity.A terahertz (THz) wave indicates an electromagnetic ...

HIGH-EFFICIENCY OPTICAL LIMITER USING METASURFACE AND PHASE-CHANGE MATERIAL

According to some aspects, a transmissive and all-dielectric optical component/limiter with great cutoff efficiency using Vanadium Dioxide (VO) as the active component is disclosed. In some embodiments, Vanadium dioxide is used for an optical limiter due to the large contrast in optical constants upon undergoing the semiconductor to metal phase transition. When triggered optically, this transition occurs within 60 fs, making the device suitable for an ultrafast laser environment. In addition, the phase transition threshold is tunable by applying stress or doping; therefore, the device cutoff intensity can be adjusted to fulfill specific requirements. 1. An optical component , comprising:a dielectric resonator; anda phase-change material on the dielectric resonator, the phase-change material having an optical property having a first characteristic associated with a first material phase and a second characteristic associated with a second material phase.2. The optical component of claim 1 , wherein the dielectric resonator has a cylindrical profile having a height Hand diameter Dand wherein phase-change material has a cylindrical profile having a height tand a diameter D claim 1 , wherein D=Dand the phase-change material is on the dielectric resonator such that a total height Hof the optical component H=H+t.3. The optical component of claim 1 , wherein the dielectric resonator comprises Si and the phase-change material comprises VO.4. The optical component of claim 3 , wherein the VOextends from the surface of the Si a predetermined thickness.5. The optical component of claim 4 , wherein the VOhas a cylindrical profile having a height tand diameter Dand wherein the Si has a cylindrical profile having a height hand a diameter D.6. The optical component of claim 4 , wherein t=30 nm and h=180 nm and D=D.7. The optical component of claim 1 , wherein the first characteristic is semiconducting and the second characteristic is reflectivity.8. The optical component of claim 1 ...

METHOD FOR GENERATING ULTRASHORT FEMTOSECOND PULSES IN OPTICAL PARAMETRIC OSCILLATOR PUMPED BY LONG PULSES

A method for generating ultrashort femtosecond pulses in the optical parametric oscillator pumped by long pulses, comprising governing dispersion and nonlinearity in the optical parametric oscillator, forming linearly-chirped long pulses with broad bandwidth in the optical parametric oscillator, compressing the linearly-chirped long pulses to femtosecond pulses by a second-order dispersion outside the optical parametric oscillator cavity. The ultrashort femtosecond pulse is generated in the OPO with long pulse pumping. 1. A method for generating ultrashort femtosecond pulses , comprising:selecting a desired signal wavelength,setting self phase modulation elements in a cavity of an optical parametric oscillator to cause a third-order nonlinearity effect in the cavity of the optical parametric oscillator,setting a net second-order dispersion in the cavity of the optical parametric oscillator and inserting a dispersive management element into the cavity of the optical parametric oscillator to guarantee that a sign of the intra-cavity net second-order dispersion is the same as a sign of the third-order nonlinearity, wherein the intra-cavity net dispersion is jointly provided by a nonlinear crystal and the dispersive management element,setting a dispersion compensation device outside the cavity of the optical parametric oscillator to provide a dispersion with a sign being opposite to the sign of the intra-cavity net dispersion, determining the amount of the dispersion by an amount of signal chirp, dechirping signal pulses, and compressing the signal pulses to a femtosecond regime after dechirping, andlinearly chirping output idler pulses with a sign being opposite to the sign of the signal pulses, compensating for the second-order dispersion outside the cavity of the optical parametric oscillator, and compressing the idler pulses to the femtosecond regime.2. The method for generating ultrashort femtosecond pulses according to claim 1 , wherein the third-order ...

METHOD FOR THE INSCRIPTION OF SECOND-ORDER NONLINEAR OPTICAL PROPERTIES INTO AN AMORPHOUS OR VITREOUS MATERIAL

A method for the inscription of second-order nonlinear optical properties on a support including an amorphous material, the method including: heating the support within a temperature range allowing the movement of charges inside the support; applying a structured electrode to the support, generating an electrical field designed to induce the formation of non-linear optical properties on the surface of the support; and cooling the support. 1. A method for inscription of second order non-linear optical properties on a support comprising an inorganic amorphous material , the method comprising:heating the support within a temperature range allowing a movement of charges inside said support;applying a structured electrode to said support generating an electrical field configured to induce a localised accumulation of electrical charges in at least one first zone of the surface of said structured electrode when said structured electrode is supplied by a voltage, said localised accumulation of charges generating at least one anisotropy structuring a second zone of the support in the form of non-linear optical properties inscribed on the surface of said support;cooling the support under the application of the electrical field generated and maintained for a predetermined duration by the application of the electrode.2. The method according to claim 1 , wherein the anisotropy formed in the support comprises a controlled geometry and localisation in the second zone of the support.3. The method according to claim 2 , wherein the anisotropy formed in the support is homogeneous along at least one direction of the second zone of the support.4. The method according to claim 1 , wherein the accumulation of charges is induced in at least one first zone of the surface of the electrode by one of the following effects:an edge effect;a peak effect;a confinement effect.5. The method according to wherein a structuring of the structured electrode is configured to create an anisotropy inducing ...

VARIABLE-ASTIGMATISM BEAM ADAPTATION DEVICE AND FREQUENCY CONVERSION UNITS

Beam adaptation devices are disclosed for variable-astigmatic adjustment of electromagnetic radiation propagating along a beam axis of the beam adaptation device. The devices include a first astigmatism lens unit, which provides at least one first lens tiltable with respect to the beam axis for astigmatism adjustment, a divergence matching lens unit with a second lens for adjusting the divergence, wherein the distance between the second lens and the first lens along the beam axis is adjustable, and a second astigmatism lens unit with at least one third lens tiltable with respect to the beam axis for astigmatism adjustment. To adjust the magnitude of the electromagnetic radiation on the third lens, the distance between the second lens and the third lens along the beam axis is adjustable. The beam adaptation device can be used, for example, for astigmatic pre-compensation in frequency conversion. 1. A beam adaptation device for continuously variable adaptation of electromagnetic radiation propagating along a beam axis of the beam adaptation device with respect to beam parameters , comprising:a first astigmatism lens unit for receiving the electromagnetic radiation, wherein the first astigmatism lens unit comprises a first lens arranged to tilt with respect to the beam axis, for adjustment of astigmatism;a divergence matching lens unit comprising a second lens for adjusting the divergence, wherein the distance between the second lens and the first lens of the first astigmatism lens unit is adjustable along the beam axis; anda second astigmatism lens unit comprising a third lens arranged to tilt relative to the beam axis for adjustment of astigmatism, wherein the distance between the second lens of the divergence matching lens unit and the third lens is adjustable along the beam axis.2. The beam adaptation device of claim 1 , further comprising:an optical input element comprising the first astigmatism lens unit and the divergence matching lens unit; andan optical output ...

QUASI-PARAMETRIC CHIRPED-PULSE AMPLIFIER

Quasi-parametric chirped-pulse amplifier comprising a signal path, a pump path, and an amplifier. A dedicated nonlinear crystal doped with rare-earth-ions is used which has strong absorption around the idler waveband. Both the chirped signal pulse and the pump pulse incident into the amplifier, where energy continuously transfers from the pump pulse to the signal pulse and a newly generated idler pulse. The energy of the generated idler pulse is continually absorbed by the rare-earth ions doped in the amplifier. 1. A quasi-parametric chirped-pulse amplifier , comprisinga signal path,a pump path, andan amplifier,wherein the signal path successively comprises a Ti:sapphire regenerative amplifier, a pulse stretcher, and a pulse compressor;{'sub': 4', '4, 'the pump path successively comprises a Nd:YVOregenerative amplifier, a Nd:YAG boost amplifier, an image-relay system, a crystal for SHG, and a beam dump, and a time jitter between the Ti:sapphire regenerative amplifier and the Nd:YVOregenerative amplifier is controlled by an electronic phase-locking loop;'}the amplifier comprises a nonlinear crystal doped with rare-earth-ions, and both a chirped signal pulse from the pulse stretcher and a pump pulse from the crystal for SHG incident into the amplifier, where energy continuously transfers from the pump pulse to the chirped signal pulse and a newly generated idler pulse;residual energy of the pump pulse is collected by the beam dump;energy of the generated idler pulse is continually absorbed by the rare-earth ions in the nonlinear crystal; andthe amplified chirped signal pulse is compressed by the pulse compressor.2. The quasi-parametric chirped-pulse amplifier according to claim 1 , wherein the nonlinear crystal is doped with one or more types of rare-earth ions to absorb the idler pulse and thereby inhibits the back conversion effect.3. The quasi-parametric chirped-pulse amplifier according to claim 1 , wherein the nonlinear crystal is doped with the rare-earth ions ...

PULSED LIGHT GENERATION DEVICE, PULSED LIGHT GENERATION METHOD, EXPOSURE APPARATUS HAVING PULSED LIGHT GENERATION DEVICE AND INSPECTION APPARATUS HAVING PULSED LIGHT GENERATION DEVICE

A pulsed light generation device, includes: a first optical fiber through which first pulsed light and second pulsed light, having an intensity that decreases while an intensity of the first pulsed light increases, and increases while the intensity of the first pulsed light decreases, having been multiplexed and entered therein, are propagated; and a second optical fiber at which the first pulsed light, having exited the first optical fiber and entered therein, is amplified while being propagated therein, wherein: at the first optical fiber, phase modulation occurs in the first pulsed light due to cross phase modulation caused by the second pulsed light; and self-phase modulation occurring in the first pulsed light at the second optical fiber is diminished by the phase modulation having occurred at the first optical fiber. 1. A pulsed light generation device , comprising:a first optical fiber through which first pulsed light and second pulsed light, having an intensity that decreases while an intensity of the first pulsed light increases, and increases while the intensity of the first pulsed light decreases, having been multiplexed and entered therein, are propagated; anda second optical fiber at which the first pulsed light, having exited the first optical fiber and entered therein, is amplified while being propagated therein, wherein:at the first optical fiber, phase modulation occurs in the first pulsed light due to cross phase modulation caused by the second pulsed light; andself-phase modulation occurring in the first pulsed light at the second optical fiber is diminished by the phase modulation having occurred at the first optical fiber.2. The pulsed light generation device according to claim 1 , wherein:the second pulsed light has a peak intensity higher than the peak intensity of the first pulsed light.3. The pulsed light generation device according to claim 1 , wherein:the second pulsed light has a maximum value at time points both before and after a time ...

OPTICAL PARAMETRIC OSCILLATOR AND SECOND HARMONIC GENERATOR USING MONOCLINIC PHASE Ga2S3 CRYSTAL

This disclosure provides a second harmonic generator and an optical parametric oscillator, the second harmonic generator and the optical parametric oscillator comprise one or more nonlinear optical frequency conversion crystal and a pump laser source, the nonlinear optical frequency conversion crystal is a monoclinic GaScrystal, the space group of the monoclinic GaScrystal is Cc, and the unit cell parameters are a=11.1 Å, b=6.4 Å, c=7.0 Å, α=90°, β=121°, γ=90°, and Z=4. 1. A second harmonic generator , comprising one or more nonlinear optical frequency conversion crystal and a pump laser source , wherein the nonlinear optical frequency conversion crystal is a monoclinic GaScrystal , the space group of the monoclinic GaScrystal is Cc , and the unit cell parameters are a=11.1 Å , b=6.4 Å , c=7.0 Å , α=90° , β=121° , γ=90° , and Z=4.2. The second harmonic generator according to claim 1 , wherein the wavelength of the laser emitted by the pump laser source is between 1 to 20 micrometers.3. The second harmonic generator according to claim 1 , wherein the pump laser source is a liquid laser claim 1 , a solid laser claim 1 , a gas laser or a semiconductor laser.4. The second harmonic generator according to claim 1 , wherein the pump laser source is a continuous wave laser or a pulse laser.5. The second harmonic generator according to claim 1 , wherein manners for achieving phase matching in the nonlinear optical crystal by the pump laser source comprise collinear claim 1 , non-collinear claim 1 , critical and non-critical phase matching.6. The second harmonic generator according to claim 1 , wherein the area of the monoclinic GaScrystal is from 0.5 to 5 cm.7. The second harmonic generator according to claim 1 , wherein the area of the monoclinic GaScrystal is from 1.0 to 5 cm.8. The second harmonic generator according to claim 1 , wherein the area of the monoclinic GaScrystal is from 1.5 to 5 cm.9. The second harmonic generator according to claim 1 , wherein the area of ...

Method and system for generating intense, ultrashort pulses of XUV and soft X-ray radiation via HHG

A method and a system for generating intense, ultrashort pulses of XUV and soft X-ray radiation via high-order harmonic generation (HHG), the method comprising selecting a nonlinear solid target and a laser source; separating a beam from the laser source into a first laser beam and a second laser beam; focusing the first laser beam onto the nonlinear solid target, thereby generating a laser ablated plume; and compressing and frequency-doubling the second laser beam and directing a resulting second compressed and frequency-doubled laser beam to the laser ablated plume, thereby yielding high-order harmonic generation of radiation of photon energies in a range between 12 eV and 36 eV. A high-order harmonic source of radiation, comprising a nonlinear solid target; a laser source; a beam splitter separating a beam from the laser source into a first beam line and a second beam line; the first beam line comprising a first focusing unit directing a first, uncompressed, laser beam onto the nonlinear solid target, to generate a laser ablated plume; and the second beam line directing a second, compressed and frequency-doubled laser beam, to the laser ablated plume, yielding high-order harmonic generation of radiation of photon energies in a range between 12 eV and 36 eV. 1. A high-order harmonic source of radiation , comprising:a nonlinear solid target;a laser source;a beam splitter separating a beam from the laser source into a first beam line and a second beam line;said first beam line comprising a first focusing unit directing a first, uncompressed, laser beam onto the nonlinear solid target, to generate a laser ablated plume; andsaid second beam line directing a second, compressed and frequency-doubled laser beam, to the laser ablated plume, yielding high-order harmonic generation of radiation of photon energies in a range between 12 eV and 36 eV.2. The high-order harmonic source of radiation of claim 1 , wherein said laser source is of a wavelength selected to achieve a ...

TERAHERTZ WAVE GENERATOR

Pumping beam L is caused to be incident on an end surface A of a nonlinear crystal , and seed beam L the diameter of which is increased by a concave lens is collected and adjusted into a collimated beam by a convex lens and is caused to be incident on the end surface A described above. As described above, the pumping beam L and the seed beam L are caused to be incident on the end surface A with the pumping beam L and the seed beam L superimposed on each other, whereby the nonlinear crystal generates terahertz wave TH. 1. A terahertz wave generator comprising: a nonlinear crystal capable of generating terahertz wave based on a parametric effect , a pumping beam emitter that emits pumping beam , a seed beam emitter that emits seed beam , and a convex lens that is disposed on an optical path of the seed beam and collects the seed beam ,the terahertz wave generator being configured so that the pumping beam and the seed beam are caused to be incident through an end surface of the nonlinear crystal to cause the nonlinear crystal to generate terahertz wave, the terahertz wave generator being characterized in thata concave lens is provided on the optical path of the seed beam, and the seed beam a diameter of which is increased by the concave lens is caused to be incident on the nonlinear crystal so as to be superimposed on the pumping beam on the end surface.2. The terahertz wave generator according to claim 1 , characterized in thatthe concave lens is disposed between the seed beam emitter and the convex lens, anda first collimator that adjusts the pumping beam emitted from the pumping beam emitter into a collimated beam is provided, and a second collimator that adjusts the seed beam emitted from the seed beam emitter into a collimated beam is provided. The present invention relates to a terahertz wave generator, and more particularly to a terahertz wave generator in which a diameter of seed beam to be incident on a nonlinear crystal is increased to be capable of ...

SUPERCONTINUUM MICROSCOPE FOR RESONANCE AND NON-RESONANCE ENHANCED LINEAR AND NONLINEAR IMAGES AND TIME RESOLVED MICROSCOPE FOR TISSUES AND MATERIALS

Supercontinuum (SC) (˜400 nm to ˜2500 nm) and a microscope produce enhanced microscopic images on sub-micron to cm scale of linear (χ) and nonlinear (χ, χ, χ. . . ) processes via resonance including linear absorption, SHG, THG, SRG, SRL, SRS. 2PEF, 3PEF, 4PEF, and inverse Raman in a microscope for 2D and 3D imaging. Images and processes in 2D and 3D arise from electronic and vibrational resonances transitions in biological and medical tissues, cells, condensed matter applications. Resonant Stimulated Raman Scattering (RSRS) is proposed to improve vibrational imaging of biomaterials by using part of SC. Quantum mechanical processes from SC for 2 and 4 photons to improve resolution and imaging using entangled photons are described. The addition of time measuring instrument like a Streak camera and the scattering coefficient μ′ can be mapped to create images of tissue and biomaterial in 5D: Space (3D), Time, and Wavelength. 1. Imaging apparatus comprising a microscope; a source of supercontinuum (SC) light; and{'sub': 1', '2', '3', '4, 'imaging means for imaging linear χand non-linear χ, χ, χprocess enhancements by observing electronic and/or vibrational resonances in materials through said microscope.'}2. Imaging apparatus as defined in claim 1 , wherein SC spectral portions spanning 400 nm-2500 nm for imaging tissues and cells through at least one of 10× claim 1 , 2× claim 1 , 30× and 40× objective lenses in said microscope; and wherein said imaging means includes NB filters to select desired wavelengths with position scanner to vary spot on sample for 2D image claim 1 , say xy claim 1 , and for 3D image scan with z for 2D plane sections.3. Imaging apparatus of claim 2 , wherein said filters are selected to provide wavelengths from the SC to image at least one non linear optical effect selected from the group comprising SHG claim 2 , Stimulated Raman Scattering (SRS) claim 2 , 4 Wave Mixing (4WM) claim 2 , Third Harmonic Generation (THG) and self-focusing using ...

CONTINUOUS SPECTRUM GENERATION APPARATUS AND ASSEMBLING METHOD THEREOF

A continuous spectrum generation apparatus including a laser light source and a plurality of condensed state transparent plates is provided. The laser light source is configured to emit a laser beam. The condensed state transparent plates are disposed on the transmission path of the laser beam in sequence, and configured to successively extend the spectral bandwidth of the laser beam in sequence. An assembling method of a continuous spectrum generation apparatus is also provided. 1. A continuous spectrum generation apparatus , comprising:a laser light source, configured to emit a laser beam; anda plurality of condensed state transparent plates, disposed on a transmitting path of the laser beam in sequence, and configured to successively and sequentially expand a spectral bandwidth of the laser beam inputted into the condensed state transparent plates.2. The continuous spectrum generation apparatus as claimed in claim 1 , wherein one of the condensed state transparent plates closest to the laser light source is disposed at a position suitable to expand the spectral bandwidth of the laser beam.3. The continuous spectrum generation apparatus as claimed in claim 2 , wherein the one of the condensed state transparent plates closest to the laser light source is substantially disposed at a beam waist of the laser beam.4. The continuous spectrum generation apparatus as claimed in claim 2 , wherein a distance from any one of remainder of the condensed state transparent plates to the laser light source is greater than a distance from a position that the condensed state transparent plate generates multiple filaments or cause material damage claim 2 , and the distance is a distance along the transmitting path of the laser beam.5. The continuous spectrum generation apparatus as claimed in claim 1 , wherein a photon energy of the laser beam emitted from the laser light source is less than or equal to a half of a bandgap of the condensed state transparent plate.6. The continuous ...

New Polar Oxysulfide for Nonlinear Optical Applications

Single crystals of a new noncentrosymmetric polar oxysulfide SrZnSO (s.g. Pmn2) grown in a eutectic KF-KCl flux with unusual wurtzite-like slabs consisting of close-packed corrugated double layers of ZnSO tetrahedra vertically separated from each other by Sr atoms and methods of making same. 1. A method for synthesizing the compound SrZnSO comprising:loading a silver tube with 1 mmol of SrO, 1 mmol of Zn, 1 mmol of S, 3.4 mmol of KF, and 4.1 mmol of KCl;{'sup': '−4', 'placing the silver tube in a silica tube that was evacuated to 10Pa and sealed;'}heating the silver tube in a tube furnace to 900° C. at 5° C./min, held for 24 h, and cooled to 600° C. at 0.17° C./min; andmaking a molten salt from a eutectic KF-KCl mixture, wherein SrO, Zn and S are dissolved in the eutectic KF-KCL mixture to form a flux.2. The method of claim 1 , further comprising claim 1 , extracting the compound from the flux by dissolving the flux in water followed by sonication.3. The method for synthesizing the compound SrZnSO of claim 1 , wherein the compound contains corrugated double layers of ZnSO tetrahedra vertically separated by Sr ions wherein an O/S anion ordered arrangement provides two distinct orientations of the ZnSO tetrahedra.4. The method for synthesizing the compound SrZnSO of claim 1 , wherein the compound crystalizes in noncentrosymmetric polar space group Pmn2.5. The method for synthesizing the compound SrZnSO of claim 1 , wherein the compound forms colorless claim 1 , transparent crystals.6. The method for synthesizing the compound SrZnSO of claim 1 , wherein the compound has a band gap of 3.86 eV.7. The method for synthesizing the compound SrZnSO of claim 1 , wherein the compound is stable up to 650° C. in Ogas atmosphere.8. The method for synthesizing the compound SrZnSO of claim 1 , wherein the compound is phase matchable with twice a SHG intensity of potassium dihydrogen phosphate (KDP).9. The method for synthesizing the compound SrZnSO of claim 1 , wherein the compound ...

Nonlinear Optical Material

A device comprising a nonlinear optical (NLO) material according to the formula XLiAlBOF. A device comprising a nonlinear optical material (NLO) according to the formula KSrCOF, wherein the NLO comprises at least one single crystal. A nonlinear optical material selected from the group consisting of KSrCOF RbBaLiAlBOF and KSrLiAlBOF. 1. A device comprising a nonlinear optical (NLO) material according to the formula XLiAlBOF.2. The device of claim 1 , wherein X comprises potassium (K) and strontium (Sr).3. The device of claim 1 , wherein X comprises KSr.4. The device of claim 1 , wherein X comprises rubidium (Rb) and barium (Ba).5. The device of claim 1 , wherein X comprises RbBa.6. The device of claim 1 , wherein the NLO exhibits a walkoff of from about 200 mrad to about 1 mrad.7. The device of claim 1 , wherein the NLO forms single crystals with a minimum diameter of from about 2 mm to about 20 mm in at least two directions.8. The device of claim 1 , wherein the NLO exhibits a second harmonic generation coefficient of greater than 0.39 pm/V.9. The device of claim 1 , wherein the NLO exhibits a band gap of greater than 6.2 eV.10. The device of claim 1 , wherein the NLO exhibits an adsorption edge of less than 200 nm.11. The device of claim 1 , wherein the NLO exhibits a laser damage threshold of greater than 5.0 GW/cm.12. The device of claim 1 , wherein the NLO exhibits a bifringence at 1064 nm ranging from about 0.05 to about 0.09.13. A device comprising a nonlinear optical material (NLO) according to the formula KSrCOF claim 1 , wherein the NLO comprises at least one single crystal.14. The device of claim 13 , wherein the NLO exhibits a walkoff of from about 1 mrad to about 200 mrad.15. The device of claim 13 , wherein the NLO forms single crystals with a minimum diameter of from about 2 mm to about 20 mm in at least two directions.16. The device of claim 13 , wherein the NLO exhibits a second harmonic generation coefficient of greater than 0.39 pm/V.17. The device ...

SECOND-ORDER OPTICAL NONLINEAR MATERIAL

Second-order optical nonlinear material arranged on a substrate, wherein the second-order optical nonlinear material comprises at least two different materials arranged in layers on the substrate. The layers are arranged on each other in a predetermined order based on the type of material and/or orientation of the layer. The predetermined order is chosen so that the layers of the at least two different materials possess no macroscopic centrosymmetry with respect to their material and/or orientation. 1. Second-order optical nonlinear material arranged on a substrate , whereinthe second-order optical nonlinear material comprises at least two different materials arranged in layers on the substrate,the layers are arranged on each other in a predetermined order based on the type of material and/or orientation of the layer, andthe predetermined order is chosen so that the layers of the at least two different materials possess no macroscopic centrosymmetry with respect to their material and/or orientation.2. Second-order optical nonlinear material according to claim 1 , wherein the second-order optical nonlinear material does not contain quantum wells which are responsible for the nonlinearity of the second-order optical nonlinear material.3. Second-order optical nonlinear material according to claim 1 , wherein the layers are deposited on the substrate as mono-layers.4. Second-order optical nonlinear material to claim 1 , wherein the material comprises at least three different materials arranged in layers in a predetermined repeated order.5. Second-order optical nonlinear material according to claim 1 , wherein the different materials are deposited on the substrate in layers by atomic-layer deposition claim 1 , physical vapour deposition claim 1 , chemical vapour deposition and/or metal organic chemical vapour deposition.6. Second-order optical nonlinear material according to claim 1 , wherein the layers of different materials comprise an orientation originating from an ...

FREQUENCY-CONVERTED LIGHT SOURCE

A nonlinear frequency conversion (NLFC) component is incorporated into a light source. The light source includes a light emitting element that emits a non-diffraction limited input light beam, and the NLFC component that exhibits walkoff and performs an NLFC process, such as second harmonic generation. An optical component is configured to converge the non-diffraction limited input beam into the NLFC component with a determined convergence half-angle. The convergence half-angle in air in a non-walkoff plane of the NLFC component is larger than a convergence half-angle angle for diffraction-limited light. Said convergence half-angle may be a multiple, ε×M, multiplied by the convergence half-angle value for diffraction-limited light, wherein ε has a value between a lower value equal to the larger of 0.4 and 1/M and an upper value of 5.0, where M is the square root of the beam quality factor for the non-diffraction limited light. 1. A light source comprising:a light emitting element that is configured to emit a non-diffraction limited input light beam;a nonlinear frequency conversion (NLFC) component that exhibits walkoff and performs second harmonic generation whereby at least a portion of an output beam outputted by the NLFC component has twice a frequency of the input beam; andan optical component positioned to receive the input light beam and configured to converge the non-diffraction limited input beam into the NLFC component;{'sup': '2', 'wherein the light emitting element is configured to emit the input light beam having a beam quality factor in at least one plane of the input beam that is greater than 2 (M>2); and'}{'sub': y', 'x', '1-x-y, 'wherein the light emitting element is a laser diode including AlInGaN (0≦x≦1, 0≦y≦1) semiconductor materials, and one dimension of an emission region of the laser diode is at least 5 μm.'}2. The light source of claim 1 , wherein a wavelength of the input beam is 400-600 nm and a wavelength of the output beam is 200-300 nm.3. ...

SYSTEM AND METHOD FOR GIGAHERTZ TO TERAHERTZ FREQUENCY SIGNAL GENERATION USING OPO AND DFG

Apparatus and method for high-power multi-function millimeter-wavelength (THz-frequency) signal generation using OPO and DFG in a single cavity. In some embodiments, the OPO-DFG cavity includes an optical parametric oscillator (OPO) non-linear material that receives pump light Ihaving pump-light frequency and generates two different lower intermediate frequencies of light—an OPO-signal beam Iand a spatially/temporally overlapping OPO-idler beam I. A difference-frequency generator non-linear material then receives the two intermediate-frequency beams Iand I, and the DFG then generates a THz-frequency output signal that has a frequency equal to the difference between the two intermediate frequencies. In some embodiments, a single-piece crystal of non-linear material is used for both OPO and DFG functions. Some embodiments use a bow-tie ring having four mirrors that define the optical path: an I-beam-entry mirror, an I-light-extraction mirror to remove unconverted I-beam, an I-beam-extraction mirror, and an I-beam-extraction mirror, and a fifth I-beam-extraction mirror. 1. An apparatus for generating a gigahertz-terahertz-range signal having a first frequency in a gigahertz to terahertz frequency range , the apparatus comprising:a pump laser that emits output pump light having a pump frequency; anda single cavity, operably coupled to the pump laser to receive the pump light,wherein the single cavity includes a first non-linear material in an optical path in the cavity that receives the pump light and generates light that includes a first intermediate frequency and a second intermediate frequency,wherein the single cavity includes a wavelength separator-combiner that spatially separates the light of the first intermediate frequency from the light of the second intermediate frequency such that the light of the first intermediate frequency propagates along a first segment of the optical path and the light of the second intermediate frequency propagates along a second ...

Optical parametric oscillator with fast tuning

An OPO with very fast and accurate tuning. The angle of the crystals in the OPO is controlled by converting the linear motion of a voice coil into rotational motion. In preferred embodiments one or two OPO crystals are mounted as a crystal unit that can rotate around an axis such that the angle of the crystals with respect to the beams' direction can be varied to generate the desired wavelengths. The crystal unit has a lever that is connected to the shaft of the voice coil such that as the shaft extend or retracts the level is pulled or pushed and the linear motion of the shaft is converted to an angular motion of the crystal unit. The position of the voice-coil shaft is controlled in a close-loop based on a built-in encoder. The relation between the reading of the encoder and the crystals' angle is recorded and provides the calibration of the unit. Preferably calibration is done by measuring the output wavelength of the OPO as a function of the encoder position. 1. An optical parametric oscillator with fast tuning comprising:A) at least one non-linear crystal mounted on a rotation stage,B) a plurality of reflecting elements; defining a resonance cavity in which a laser pump beam, defining a pump beam direction, is converted into a signal and idler beam,C) a rotation stage for rotating the at least one non-linear crystal with respect to the pump beam direction,D) a voice coil, comprising a coil and a magnet, adapted to produce fast linear motion,E) an encoder to provide accurate measurement of the position of the magnet or the coil,F) a feedback control loop to control the motion of the motor by using the position information provided by the encoder andG) a link element for converting linear motion of the voice coil to angular motion of the rotation stage.2. The optical parametric oscillator as in wherein the magnet is a moving component.3. The optical parametric oscillator as in wherein the coil is a moving component.4. The optical parametric oscillator as in ...

183 nm CW Laser And Inspection System

A laser assembly generates continuous (CW) laser output light in the range of approximately 181 nm to approximately 185 nm by generating fourth harmonic light from first fundamental CW light having a first fundamental wavelength between 1 μm and 1.1 μm, generating fifth harmonic light by mixing the fourth harmonic light with the first fundamental CW light, and then mixing the fifth harmonic light with second fundamental or signal CW light having a second wavelength between 1.26 μm and 1.82 μm. The fifth harmonic light is generated using an external cavity that circulates first fundamental CW light through a first nonlinear crystal, and by directing the fourth harmonic light through the first nonlinear crystal. The laser output light is generated using a second cavity that passes circulated second fundamental or signal CW light through a second nonlinear crystal, and directing the fifth harmonic light through the second nonlinear crystal. 1. A laser assembly for generating continuous (CW) laser output light having a wavelength in the range of approximately 181 nm to approximately 185 nm , said laser assembly comprising:a first fundamental CW laser configured to generate a first fundamental CW light having a first fundamental frequency with a corresponding first fundamental wavelength between about 1 μm and 1.1 μm;a fourth harmonic generation module coupled to receive a first portion of the first fundamental CW light, and configured to generate a fourth harmonic light having a fourth harmonic frequency equal to four times the first fundamental frequency;a fifth harmonic generation module coupled to receive a second portion of the first fundamental CW light and to receive said fourth harmonic light from the fourth harmonic generation module, said fifth harmonic generation module being configured to generate a fifth harmonic light having a fifth harmonic frequency equal to five times the first fundamental frequency by mixing said fourth harmonic light and said second ...

PERIODIC POLARIZATION REVERSAL ELECTRODE, PERIODIC POLARIZATION REVERSAL STRUCTURE FORMING METHOD AND PERIODIC POLARIZATION REVERSAL ELEMENT

A periodic polarization reversal electrode, periodic polarization reversal structure forming method and periodic polarization reversal element. The element includes a plurality of stripe electrode sections with a stripe shape extending in parallel at a gap from each other, arranged in contact with the +Z surface of a ferroelectric crystal substrate; an insulation film arranged over the +Z surface so as to cover the plurality of stripe electrode sections; and an equipotential electrode section which has a portion that opposes at least a part of each of the plurality of stripe electrode sections across the insulation film and is arranged over the insulation film without contacting the ferroelectric crystal substrate or the plurality of stripe electrode sections, wherein an electric field is generated in the area of the ferroelectric crystal substrate directly below the plurality of stripe electrode sections by applying a voltage to the equipotential electrode section. 1. A periodic polarization reversal electrode characterized in that it comprises:a plurality of stripe electrode sections with a stripe shape extending in parallel at a gap from each other, arranged in contact with the +Z surface of a ferroelectric crystal substrate;an insulation film arranged over said +Z surface so as to cover said plurality of stripe electrode sections; andan equipotential electrode section which has a portion that opposes at least a part of each of said plurality of stripe electrode sections across said insulation film and is arranged over said insulation film without contacting said ferroelectric crystal substrate or said plurality of stripe electrode sections,wherein an electric field is generated in the area of said ferroelectric crystal substrate directly below said plurality of stripe electrode sections by applying a voltage to said equipotential electrode section.2. The periodic polarization reversal electrode described in claim 1 , characterized in that it further comprises a ...

AN OPTICAL PARAMETRIC GENERATOR

An optical parametric generator comprises a seed laser feeding an optical system. The seed laser is arranged to provide a seed beam at either a signal frequency of a signal wave or an idler frequency of an idler wave. Further, the optical parametric generator comprises a pump laser of a defined type feeding the optical system. The pump laser emits ultra-short optical pulses as a pump wave. In addition, the optical parametric generator comprises a second order non-linear crystal of a defined type arranged in the optical system. The defined type of the crystal and the defined type of the pump laser are selected so that the signal wave or the idler wave are locked in an edge of the pump wave. 1. An optical parametric generator comprising:a seed laser feeding an optical system, wherein the seed laser is arranged to provide a seed beam at either a signal frequency of a signal wave or an idler frequency of an idler wave;a pump laser of a defined type feeding the optical system, wherein the pump laser emits ultra-short optical pulses as a pump wave; anda second order non-linear crystal of a defined type arranged in the optical system,wherein the defined type of the crystal and the defined type of the pump laser are selected so that the signal wave or the idler wave are locked in an edge of the pump wave.2. The optical parametric generator of claim 1 , wherein the ultra-short optical pulses emitted by the pump laser are less than 1 picosecond in duration.3. The optical parametric generator of claim 1 , wherein the optical parametric generator is a high gain optical parametric generator.4. The optical parametric generator of claim 3 , wherein the gain of the optical parametric generator is in the range forty to seventy dB/cm.5. The optical parametric generator of claim 4 , wherein the gain of the optical parametric generator is in the range fifty to sixty dB/cm.6. The optical parametric generator of claim 4 , wherein the gain of the optical parametric generator is in the ...

LIGHT SOURCE DEVICE AND WAVELENGTH CONVERSION METHOD

A light source emits first incident light to a first polarization-reversed structure. The first polarization-reversed structure then converts the wavelength of the first incident light to emit a higher harmonic wave. A fiber coupler divides the higher harmonic wave output from the first polarization-reversed structure into output light emitted from the light source device and feedback light. The feedback light enters a second polarization-reversed structure. The second polarization-reversed structure then converts the wavelength of the feedback light to emit second incident light. The second incident light has the same wavelength as the first incident light. The second incident light enters a first wavelength converter. 1. A light source device , comprising:a light source that emits first incident light;a first wavelength converter that receives the first incident light and converts a wavelength of the first incident light to emit a higher harmonic wave;a dividing portion that divides the higher harmonic wave output from the first wavelength converter into output light emitted from the light source device and feedback light; anda second wavelength converter that receives the feedback light and converts a wavelength of the feedback light to emit second incident light that has [[the]] a same wavelength as the first incident light,wherein the second incident light enters the first wavelength converter without depending on the light source.3. The light source device according to claim 1 , further comprising:a gain medium that is provided between the light source and the first wavelength converter and used for laser oscillation,wherein the second incident light enters the gain medium along with the first incident light.4. The light source device according to claim 3 , whereinthe gain medium is a polarization-maintaining optical fiber, andthe polarization-maintaining optical fiber has a fiber Bragg grating.5. The light source device according to claim 1 , wherein the ...

MULTI-CRYSTAL FREQUENCY CONVERTER

Optical apparatus for performing a frequency-conversion operation on laser-radiation includes three elongated optically nonlinear crystals arranged end-to-end on a propagation-axis of the laser-radiation. Each of the crystals is arranged to perform the same frequency-conversion operation. The length of the crystals is made progressively shorter in the propagation-axis direction. 1. Apparatus for performing a frequency-conversion operation on laser-radiation , the apparatus comprising:first and second optically nonlinear crystals located on a propagation-axis of the laser-radiation and numbered in consecutive numerical order in the propagation-axis direction, with each of the optically nonlinear crystals arranged to perform the same frequency-conversion operation; andwherein the second optically nonlinear crystal has a length less than that of the first optically nonlinear crystal.2. The apparatus of claim 1 , wherein the second optically nonlinear crystal has a length at least 10% less than that of the first optically nonlinear crystal.3. The apparatus of claim 1 , wherein the frequency-conversion operation is frequency-doubling.4. The apparatus of claim 1 , wherein the frequency-conversion operation is sum-frequency mixing.5. The apparatus of claim 1 , wherein the optically nonlinear crystals are arranged end-to-end on the propagation axis.6. The apparatus of claim 1 , further including a third optically nonlinear crystal located on the propagation-axis following the second crystal and arranged to perform the frequency-conversion operation.7. The apparatus of claim 6 , wherein the third optically nonlinear crystal has a length less than that of the second optically nonlinear crystal.8. The apparatus of claim 6 , wherein the third optically nonlinear crystal has a length about equal to that of the second optically nonlinear crystal.9. Apparatus for converting radiation having a first frequency to radiation having a second frequency different from the first frequency ...

ELECTRO-OPTIC POLYMER AND ELECTRO-OPTIC DEVICES MADE THEREFROM

According to an embodiment, an electro-optic polymer comprises a host polymer and a guest nonlinear optical chromophore having the structure D-π-A, wherein: D is a donor, π is a π-bridge, and A is an acceptor; a bulky substituent group is covalently attached to at least one of D, π, or A; and the bulky substituent group has at least one non-covalent interaction with part of the host polymer that impedes chromophore depoling. 136.-. (canceled)37. An electro-optic polymer , comprising:a host polymer including host aryl groups; anda guest nonlinear optical chromophore having the structure D-π-A, wherein D is an electron donor, π is an electronically conjugated bridge electronically conjugated to D, and A is an electron acceptor electronically conjugated to π and configured to exchange electron density with D through p-orbital electrons of π;wherein the guest chromophore includes at least two guest aryl substituent groups covalently bound to the chromophore;wherein each guest aryl substituent group is configured to non-covalently interact with one or more host aryl groups.38. The electro-optic polymer of claim 37 , wherein the chromophore is configured to be electrically poled into an alignment; andwherein the non-covalent interaction between each guest aryl substituent group and one or more host aryl groups is configured to impede chromophore depoling.39. The electro-optic polymer of claim 37 , wherein the chromophore is poled; andwherein the non-covalent interaction between at least a portion of the guest aryl substituent groups and one or more host aryl groups impedes chromophore depoling.40. The electro-optic polymer of claim 37 , wherein at least one of the guest aryl substituent groups is covalently bound to π.41. The electro-optic polymer of claim 40 , wherein at least one of the guest aryl substituent groups is covalently bound to D.42. The electro-optic polymer of claim 40 , wherein at least one of the guest aryl substituent groups is covalently bound to A.43. ...

Self-Starting Mode Locking Soliton Comb Device

A self-starting mode locking soliton device includes a first optical port to accept an input coherent light. A second optical port provides an output comb of a plurality of wavelengths. A comb resonator with optical Kerr nonlinearity and anomalous group-velocity dispersion is optically coupled to both of said first optical port and said second optical port. The resonator includes an optical property of a negative nonlinear bistability to enable the self-starting mode locking of a Kerr soliton comb. A method of self-starting mode locking is described. A method of producing the negative nonlinear bistability is also described. 1. A mode locking soliton device comprising:a first optical port to accept an input coherent light;a second optical port to provide an output comb of a plurality of wavelengths; anda comb resonator with optical Kerr nonlinearity and anomalous group-velocity dispersion optically coupled to both of said first optical port and said second optical port, said resonator comprising an optical property of a negative nonlinear bistability.2. The mode locking soliton device of claim 1 , wherein in response to said input coherent light claim 1 , said output comb of said plurality of wavelengths is self-starting.3. The mode locking soliton device of claim 1 , wherein said mode locking soliton device comprises a self-starting mode locking soliton microcomb device.4. The mode locking soliton device of claim 1 , wherein said resonator comprises a ring resonator.5. The mode locking soliton device of claim 4 , wherein said ring resonator is coupled to length of an optical waveguide claim 4 , and either end of said optical waveguide provides said first optical port and said second optical port.6. The mode locking soliton device of claim 1 , wherein said input coherent light comprises a laser light.7. The mode locking soliton device of claim 1 , wherein said resonator comprises a planar resonator of an integrated optical structure.8. The mode locking soliton ...

LASER LIGHT SOURCE

The present invention relates to a laser light source capable of suppressing variation in propagation state of randomly-polarized laser light. In the laser light source, an isolator including a Faraday rotation crystal having a positive thermooptic constant, and a nonlinear optical crystal having a negative thermooptic constant are arranged in order along a traveling direction of laser light. The nonlinear optical crystal is arranged in a state off normal incidence of incident light so that a propagation axis of light propagating in the crystal is parallel to an optic axis of the crystal. 1. A laser light source comprising:a seed light source;a fiber laser for amplifying pulsed seed light emitted from the seed light source;a collimator lens for collimating laser light emitted from the fiber laser;an isolator having an entrance end face for the laser light collimated by the collimator lens to enter and an exit end face for the laser light to exit, the isolator comprising a Faraday rotation crystal having a positive thermooptic constant, which is arranged between the entrance end face and the exit end face; anda nonlinear optical crystal having a negative thermooptic constant, which is arranged on an optical path of the laser light propagating between the collimator lens and the isolator or on an optical path of the laser light emitted from the exit end face of the isolator, the nonlinear optical crystal having a first end face for the laser light to enter and a second end face for the laser light to exit, the second end face being opposed to the first end face,wherein the nonlinear optical crystal is arranged so that an angle between a first propagation axis of the laser light incident to the first end face of the nonlinear optical crystal and a normal to the first end face is larger than 0° and less than 90° and so that a second propagation axis of the laser light propagating in the nonlinear optical crystal is parallel to an optic axis of the nonlinear optical ...

CASCADED OPTICAL HARMONIC GENERATION

A cascaded harmonic generator, for cascaded optical harmonic generation from an optical beam provided by a laser source, may include a second harmonic generator to generate a second harmonic optical beam based on a residual beam associated with the optical beam. The cascaded harmonic generator may include a third harmonic generator to generate a third harmonic optical beam based on the second harmonic optical beam and the optical beam. The third harmonic generator may be positioned in an optical path upstream from the second harmonic generator. A harmonic generator delay time, associated with the optical path, may be approximately equal to, or may be an approximate integer multiple of, a laser source round-trip time. 1. A cascaded harmonic generator for cascaded optical harmonic generation from an optical beam provided by a laser source , comprising:a second harmonic generator to generate a second harmonic optical beam based on a residual beam associated with the optical beam; and the third harmonic generator being positioned in an optical path upstream from the second harmonic generator,', 'where a harmonic generator delay time, associated with the optical path, is approximately equal to, or is an approximate integer multiple of, a laser source round-trip time., 'a third harmonic generator to generate a third harmonic optical beam based on the second harmonic optical beam and the optical beam,'}2. The cascaded harmonic generator of claim 1 , where an optical path length of the optical path matches an optical path length of a round-trip optical path associated with the laser source.3. The cascaded harmonic generator of claim 1 , further comprising an adjustable mechanical component to adjust an optical path length of the optical path.4. The cascaded harmonic generator of claim 1 , where a length of the optical path is fixed.5. The cascaded harmonic generator of claim 1 , further comprising: 'the fourth harmonic generator being positioned in the optical path upstream ...

METHOD AND SYSTEM FOR FREQUENCY CONVERSION

A system for frequency conversion, comprises a laser source and a harmonic generation crystal. The laser source is configured to produce optical pulse energy of less than 100 μJ. The harmonic generation crystal comprises a structure characterized by a nonlinear susceptibility, and a crystal grating period which adiabatically varies along the longitudinal direction in a manner that the crystal grating period is inversely proportional to a crystal grating function of a coordinate z measured along the longitudinal direction. 1. A system for frequency conversion , comprising a laser source and a harmonic generation crystal , wherein said laser source is configured to produce optical pulse energy of less than 100 μJ , and wherein said harmonic generation crystal comprises a structure characterized by a nonlinear susceptibility , and a crystal grating period which adiabatically varies along said longitudinal direction in a manner that said crystal grating period is inversely proportional to a crystal grating function of a coordinate z measured along said longitudinal direction.2. The system of claim 1 , wherein said laser source is configured to produce optical pulse energy of less than 10 μJ.3. The system of claim 1 , wherein said laser source is configured to produce optical pulse energy of less than 1 μJ.4. The system of claim 1 , wherein said laser source is configured to produce optical pulse energy of less than 0.1 μJ.5. A method of frequency conversion claim 1 , comprising directing a plurality of input optical pulses claim 1 , each having the same wavelength and energy of less than 100 μJ claim 1 , to a harmonic generation crystal thereby effecting frequency multiplication of said optical pulses claim 1 , wherein said harmonic generation crystal comprises a structure characterized by a nonlinear susceptibility claim 1 , and a crystal grating period which adiabatically varies along said longitudinal direction in a manner that said crystal grating period is ...

METHOD OF FABRICATING WAVELENGTH CONVERSION DEVICE

Disclosed is a method for fabricating a wavelength conversion device that is capable of suppressing unintended and random polarization reversal due to heating thereby achieving higher wavelength conversion efficiency. The method includes: forming an insulating layer on one place of a crystal substrate naturally and uniformly polarized in a thickness direction; forming an insulating layer pattern with line-and-space by photolithography; then supplying conductive fluid to both planes of the crystal substrate to apply voltage to the crystal substrate, thereby a wavelength conversion device that is periodically polarization-reversed is fabricated. When temperature of the crystal substrate decreases after heating, an ionizer supplies ions to a surface of the crystal substrate, negative ions collect on +z plane, and positive ion collect on −z plane, thereby unintended and random polarization reversal is suppressed. 1. A method of fabricating a wavelength conversion device , the device being fabricated from a crystal substrate and formed from a ferroelectric crystal demonstrating a non-linear optical effect , the method comprising:heating the crystal substrate;suppressing a polarization reversal on a surface of the crystal substrate in which natural polarization occurs when temperature of the crystal substrate being changing due to the heating; andforming a structure that is periodically polarization-reversed in the direction perpendicular to a thickness direction of the crystal substrate on the surface of the crystal substrate.2. The method of fabricating a wavelength conversion device according to claim 1 , whereinthe suppressing the polarization reversal is carried out by collecting, on the surface of the crystal substrate, ions having a polarity different from a polarity on a region of the surface of the crystal substrate in which natural polarization occurs, the surface being to be periodically polarization-reserved.3. The method of fabricating a wavelength conversion ...

OPTICAL ASSEMBLY FOR THE HYPERSPECTRAL ILLUMINATION AND EVALUATION OF AN OBJECT

The invention relates to the optical assembly for the illumination and hyperspectral evaluation of an object, having a light source or an optical element () at which a light source radiates, wherein the light source or the optical element is designed to divide pairs of unambiguously assignable photons into a first light beam () and a second light beam () in such a way that the first light beam hits a first detector system () and the second light beam is directed at an object () and light radiation coming from the object is directed at an optical element () which spectrally decomposes said light radiation and, from the optical element spectrally decomposing said light radiation is directed at a second detector system (). The first light beam can also be directed at a spectrally decomposing optical element and from there, at a first detector system, and the light radiation coming from the object can be directed directly at the second detector system. The first detector system is designed to perform a spatially resolved sensing of the first light beam, and the first detector system or the second detector system is designed to perform a spectrally resolved sensing of the second light beam. The detector system are connected to an electronic evaluation unit (), by means of which the measurement signals captured with spatial and spectral resolution are associated. The first and second light beams are spectrally, spatially and temporally correlated. 11. An optical arrangement for illuminating and hyperspectrally evaluating an object with a light source or an optical element () that is irradiated by a light source , wherein{'b': 1', '2', '5, 'the light source or the optical element () is embodied to split pairs of uniquely assignable photons into a first light beam () and a second light beam () in such a way that'}{'b': 2', '4', '5', '7, 'the first light beam () is incident on a first detector system () and the second light beam () is incident on an object () and'}{'b': 7', ...

OPTICAL WAVELENGTH CONVERSION DEVICE AND METHOD FOR MANUFACTURING THE SAME

An object is to provide, for example, a method for manufacturing an optical wavelength conversion device having a structure that enables efficient formation of crystal regions on the surface of, or inside, an amorphous material. An amorphous main body is intermittently irradiated with a first laser beam for generating a high-density excited electron region inside the main body and a second laser beam for heating the high-density excited electron region, with respective focus regions of the first and second laser beams overlapping each other. During the intermittent irradiation with the first and second laser beams, the relative position of the main body and the overlapping focus region of the first and second laser beams are varied. This enables part of the main body where the overlapping focus region moves to serve as a heat source for forming a crystal region. 1. A method for manufacturing an optical wavelength conversion device , comprising:a preparing step of preparing a main body made of an amorphous material;a first irradiating step of irradiating the main body with a first laser beam focused on a surface of or inside the main body and exciting electrons in a focus region of the first laser beam, the first laser beam being a femtosecond laser beam having a wavelength outside an absorption wavelength band of the main body;a second irradiating step of irradiating the main body with a second laser beam focused to overlap the focus region of the first laser beam and heating the focus region of the first laser beam, the second laser beam being a continuous wave laser beam or a pulsed laser beam with a pulse width of one picosecond or more, the second laser beam being a laser beam having, outside the focus region of the first laser beam, a wavelength outside the absorption wavelength band of the main body; anda scanning step of varying a relative position of the main body and an overlapping focus region of the first and second laser beams while the first and second ...

Periodically poled crystal and optical parametric amplifier

The present invention belongs to the technical field of lasers, and particularly relates to a periodically poled crystal and an optical parametric amplifier. The present invention provides a periodically poled crystal, including a first nonlinear region, a linear region and a second nonlinear region, wherein the first nonlinear region and the second nonlinear region both have periodically poled structures. The optical parametric amplifier having the periodically poled crystal can separate the idler wave from the signal wave besides achieving the basic function of optical parametric amplification because the by-produced idler wave transmits in a direction different from the directions that the signal wave and the pump wave transmit, and therefore the energy reflow is suppressed when the optical parametric amplifier has reached saturated amplification, and the performance of the optical parametric amplifier is significantly improved.

ENHANCED ORGANIC ELECTRO-OPTIC POLING THROUGH NANOPARTICLE DOPING

A method of poling an organic polymeric electro-optic material. The method includes doping the organic polymeric electro-optic material with nanoparticles. The method also includes heating the organic polymeric electro-optic material to a poling temperature. The method also includes poling the organic polymeric electro-optic material by applying an electric field across the organic polymeric electro-optic material. 1. A method of poling an organic polymeric electro-optic material , the method comprising: blending the organic polymeric electro-optic material and the nanoparticles using a mixed solvent system with cyclopentanone and toluene in a 2:1 ratio;', 'sonicating carbon fullerene (C60) nanoparticles;', 'dissolving in the carbon fullerene nanoparticles in toluene to form a mixture;', 'adding cyclopentanone, poly(methyl methacrylate), and (N-Ethyl-N-(2-hydroxyethyl)-4-(4-nitrophenylazo)aniline) to the mixture to form a second mixture;', 'spin casting the second mixture onto a substrate, the substrate at least partially coated with a transparent or semitransparent conducting electrode film, wherein spin casting forms a slide;', 'annealing the slide at about eighty degrees Celsius for twelve hours with a nitrogen gas purging rate less than about 0.5 cubic feet per hour; and', 'thereafter depositing gold by thermal vapor deposition onto the slide., 'doping the organic polymeric electro-optic material with nanoparticles, wherein doping further comprises;'}heating the organic polymeric electro-optic material to a poling temperature; andpoling the organic polymeric electro-optic material by applying an electric field across the organic polymeric electro-optic material.2. The method of claim 1 , wherein doping comprises a range of about 0.05 percent and 0.3 percent weight of carbon fullerene (C60) nanoparticles.3. The method of claim 1 , wherein the organic polymeric electro-optic material comprises poly(methyl methacrylate)/(N-Ethyl-N-(2-hydroxyethyl)-4-(4- ...

Kind of visible ultraviolet band optical frequency converter

A visible ultraviolet band optical frequency converter. The processing period of a nonlinear optical crystal is controlled to provide an additional period phase to meet a phase matching condition so as to realize effective optical frequency conversion. The additional period phase is characterized in that phase gratings periodically arranged according to different refractive indexes are formed in the crystal through technologies, including laser micro-processing, ion etching and the like, a nonlinear frequency conversion inverse process is avoided through the periodic structure damage of the crystals in the phase gratings and an additional period phase is provided, phase mismatch caused by the insufficient double refraction of the nonlinear optical crystal is avoided, and efficient frequency doubling or sum frequency output is realized. 1. A visible ultraviolet band optical frequency converter , wherein the optical frequency converter is a non-linear optical crystal , and amorphous regions distributed at regular intervals are formed inside the optical crystal; and the amorphous regions may not achieve coherent superposition of non-linear optical effects , thereby blocking the conversion of frequency-doubled light to fundamental-frequency light , but the amorphous regions may provide a phase difference between the fundamental-frequency light and the frequency-doubled light.2. The visible ultraviolet band optical frequency converter according to claim 1 , wherein the phase difference between the fundamental-frequency light and the frequency-doubled light provided by the amorphous regions is Δφ=(2m+1)π claim 1 , where m is an integer.3. The visible ultraviolet band optical frequency converter according to claim 1 , wherein the amorphous regions distributed at regular intervals are phase gratings with periodic refractive indexes perpendicular to the direction of light transmission claim 1 , the phase gratings are arranged in parallel along the direction of light ...

MULTI-MODE CAVITIES FOR HIGH-EFFICIENCY NONLINEAR WAVELENGTH CONVERSION FORMED WITH OVERLAP OPTIMIZATION

A dual frequency optical resonator configured for optical coupling to light having a first frequency ω. The dual frequency optical resonator includes a plurality of alternating layer pairs stacked in a post configuration, each layer pair having a first layer formed of a first material and a second layer formed of a second material, the first material and second materials being different materials. The first layer has a first thickness and the second layer has a second thickness, the thicknesses of the first and second layer being selected to create optical resonances at the first frequency ω and a second frequency ω which is a harmonic of ω and the thicknesses of the first and second layer also being selected to enhance nonlinear coupling between the first frequency ω and a second frequency ω 1. A dual frequency optical resonator configured for optical coupling to light having a first frequency ω , the dual frequency optical resonator comprising:a plurality of alternating layer pairs stacked in a post configuration, each layer pair having a first layer formed of a first material and a second layer formed of a second material, the first material and second materials being different materials,{'sub': 1', '2', '1', '1', '2, 'the first layer having a first thickness and the second layer having a second thickness, the thicknesses of the first and second layer being selected to create optical resonances at the first frequency ωand a second frequency ωwhich is a harmonic of ωand the thicknesses of the first and second layer also being selected to enhance nonlinear coupling between the first frequency ωand a second frequency ω.'}2. The dual frequency optical resonator of wherein ωis a second harmonic of ω.3. The dual frequency optical resonator of wherein ωis a third harmonic of ω.4. The dual frequency optical resonator of wherein the thicknesses of the first and second layer are selected to maximize the nonlinear coupling between the first frequency ωand a second frequency ...

Method for gigahertz to terahertz frequency signal generation using opo and dfg

Apparatus and method for high-power multi-function millimeter-wavelength (THz-frequency) signal generation using OPO and DFG in a single cavity. In some embodiments, the OPO-DFG cavity includes an optical parametric oscillator (OPO) non-linear material that receives pump light IP having pump-light frequency and generates two different lower intermediate frequencies of light—an OPO-signal beam IS and a spatially/temporally overlapping OPO-idler beam II. A difference-frequency generator non-linear material then receives the two intermediate-frequency beams II and IS, and the DFG then generates a THz-frequency output signal that has a frequency equal to the difference between the two intermediate frequencies. In some embodiments, a single-piece crystal of non-linear material is used for both OPO and DFG functions. Some embodiments use a bow-tie ring having four mirrors that define the optical path: an IP-beam-entry mirror, an IP-light-extraction mirror to remove unconverted IP-beam, an II-beam-extraction mirror, and an IS-beam-extraction mirror, and a fifth ITHz-beam-extraction mirror.

Method and apparatus for frequency comb generation using an optical manipulator

An apparatus for frequency comb generation comprises a component of second order nonlinearity, where the component is configured to interact with a laser beam or derivatives of the laser beam and thereby generate frequencies for the frequency comb. The apparatus comprises advantageously an optical manipulator, which both comprises the component but additionally is configured to introduce the beam or its derivatives in a repetitive or resonating manner to the component. The component is e.g. a monolithic or other solid optical resonator or microresonator comprising optical crystal and having said second order nonlinearity. 1. An apparatus for frequency comb generation using an optical manipulator , an input for guiding a continuous wave pumped laser beam into the optical manipulator,', 'a component comprising second order nonlinearity, the optical manipulator being configured to introduce said continuous wave pumped laser beam and/or its derivatives in a resonating manner to said component, whereupon the component is configured to interact with said laser beam or derivatives of said laser beam and thereby generate frequencies for the frequency comb, and', 'an output configured to output frequencies of the frequency comb generated by said component,, 'wherein the apparatus comprises 'said component comprises at least one first and second portions, wherein a phase matching of the first portion deviates from zero, whereupon the second portion is configured to generate the frequency comb with frequencies differing from said frequency comb generated by said first portion.', 'wherein'}2. An apparatus of claim 1 , wherein said component comprises quasi-phase-matched optical nonlinear crystal material claim 1 , comprising periodically poled lithium niobate (PPLN) claim 1 , periodically poled lithium tantalite (PPLT) claim 1 , periodically poled potassium titanyl phosphate (PPKTP) claim 1 , lithium niobate doped with metal ions claim 1 , or birefringently phase-matched ...

OPTICAL COMB CARRIER ENVELOPE FREQUENCY CONTROL USING A ROTATING WAVEPLATE FREQUENCY SHIFTER

A system for optical comb carrier envelope offset frequency control includes a mode-locked laser and a frequency shifter. The mode-locked laser produces a laser output. The frequency shifter shifts the laser output to produce a frequency shifted laser output based at least in part on one or more control signals. The frequency shifted laser output has a controlled carrier envelope offset frequency. The frequency shifter includes a first polarization converter, a rotating half-wave plate, and a second polarization converter. 1. A system for optical comb carrier envelope offset frequency control , comprising:a mode-locked laser, wherein the mode-locked laser produces a laser output; anda frequency shifter, wherein the frequency shifter shifts the laser output to produce a frequency shifted laser output based at least in part on one or more control signals, wherein the frequency shifted laser output comprises a controlled carrier envelope offset frequency, and wherein the frequency shifter comprises a first polarization converter, a rotating half-wave plate, and a second polarization converter.2. The system of claim 1 , wherein the first polarization converter comprises a quarter-wave plate.3. The system of claim 1 , wherein the second polarization converter comprises a quarter-wave plate.4. The system of claim 1 , further comprising:a beat note generator, wherein a portion of the frequency shifted laser output is used to produce an optical beat note; anda control signal generator, wherein the control signal generator produces the one or more control signals to control the optical beat note.5. The system of claim 4 , wherein the one or more control signals control(s) the rotation of the rotating half-wave plate.6. The system of claim 1 , wherein the rotating half-wave plate comprises an electro-optic polarization controller.7. The system of claim 6 , wherein one or more control signals cause(s) the electro-optic polarization controller to emulate the rotating half-wave ...

OPTICAL ELEMENT

Provided is an optical element including: a main body which is formed of a medium capable of transmitting first light and second light having a wavelength longer than that of the first light, in which the main body includes an incident region into which the first light and the second light are incident, in which a gap which is inclined with respect to the incident region and in which a medium having a refractive index with respect to the first light and the second light lower than that of the main body is disposed is provided inside the main body, and in which a gap width from an interface bordering the main body and the gap is larger than a penetration length of an evanescent wave of the first light at the interface and is smaller than a penetration length of an evanescent wave of the second light at the interface. 1. An optical element comprising:a main body which is formed of a medium capable of transmitting first light and second light having a wavelength longer than that of the first light,wherein the main body includes an incident region into which the first light and the second light are incident,wherein a gap which is inclined with respect to the incident region and in which a medium having a refractive index with respect to the first light and the second light lower than that of the main body is disposed is provided inside the main body, andwherein a gap width from an interface bordering the main body and the gap is larger than a penetration length of an evanescent wave of the first light at the interface and is smaller than a penetration length of an evanescent wave of the second light at the interface.2. The optical element according to claim 1 ,wherein the main body includes a first portion including an incident region into which the first light and the second light are coaxially incident and an emission region which emits the first light reflected by the interface and a second portion including an emission region which emits the second light passing ...

METHOD AND APPARATUS FOR GENERATING THZ RADIATION

A method of generating THz radiation includes the steps of generating optical input radiation with an input radiation source device (), irradiating a first conversion crystal device () with the optical input radiation, wherein the first conversion crystal device () is arranged in a single pass configuration, and generating the THz radiation having a THz frequency in the first conversion crystal device () in response to the optical input radiation by an optical-to-THz-conversion process, wherein a multi-line frequency spectrum is provided by the optical input radiation in the first conversion crystal device (), and the optical-to-THz-conversion process includes cascaded difference frequency generation using the multi-line frequency spectrum. Furthermore, a THz source apparatus being configured for generating THz radiation and applications thereof are described.

GIGAHERTZ TO TERAHERTZ FREQUENCY SIGNAL GENERATION USING OPO AND DFG

Apparatus and method for high-power multi-function millimeter-wavelength (THz-frequency) signal generation using OPO and DFG in a single cavity. In some embodiments, the OPO-DFG cavity includes an optical parametric oscillator (OPO) non-linear material that receives pump light Ihaving pump-light frequency and generates two different lower intermediate frequencies of light—an OPO-signal beam Iand a spatially/temporally overlapping OPO-idler beam I. A difference-frequency generator non-linear material then receives the two intermediate-frequency beams Iand I, and the DFG then generates a THz-frequency output signal that has a frequency equal to the difference between the two intermediate frequencies. In some embodiments, a single-piece crystal of non-linear material is used for both OPO and DFG functions. Some embodiments use a bow-tie ring having four mirrors that define the optical path: an I-beam-entry mirror, an I-light-extraction mirror to remove unconverted I-beam, an I-beam-extraction mirror, and an I-beam-extraction mirror, and a fifth I-beam-extraction mirror. 1. An apparatus for generating a gigahertz-terahertz-range signal having a first frequency in a gigahertz to terahertz frequency range , the apparatus comprising:a pump laser that outputs pump light having a pump frequency; anda single cavity, operably coupled to the pump laser to receive the pump light,wherein the single cavity includes a non-linear material in an optical path in the cavity that receives the pump light and generates light that includes a first intermediate frequency and a second intermediate frequency,wherein the single cavity includes a wavelength separator-combiner that spatially separates the light of the first intermediate frequency from light of the second intermediate frequency, and that recombines the spatially separated light into a single beam,wherein the single cavity includes a non-linear material in the optical path in the cavity that uses the light of the first ...

OPTICAL WAVELENGTH CONVERSION DEVICE

An object is to provide, for example, a method for manufacturing an optical wavelength conversion device having a structure that enables efficient formation of crystal regions on the surface of, or inside, an amorphous material. An amorphous main body is intermittently irradiated with a first laser beam for generating a high-density excited electron region inside the main body and a second laser beam for heating the high-density excited electron region, with respective focus regions of the first and second laser beams overlapping each other. During the intermittent irradiation with the first and second laser beams, the relative position of the main body and the overlapping focus region of the first and second laser beams are varied. This enables part of the main body where the overlapping focus region moves to serve as a heat source for forming a crystal region. 1. An optical wavelength conversion device comprising:a main body configured to allow light to propagate therein; anda plurality of crystal regions arranged inside the main body along a propagation direction of the light,wherein the plurality of crystal regions each have a spontaneous polarization oriented along the propagation direction.2. The optical wavelength conversion device according to claim 1 , whereinadjacent ones of the plurality of crystal regions are arranged, with portions thereof having the respective spontaneous polarizations oriented along the propagation direction in contact with each other.3. The optical wavelength conversion device according to claim 1 , whereinadjacent ones of the plurality of crystal regions are spaced apart, with an amorphous region therebetween.4. The optical wavelength conversion device according to claim 1 , whereinthe main body includes a substrate with a channel waveguide structure having an optical axis extending along the propagation direction.5. The optical wavelength conversion device according to claim 1 , whereinthe main body includes an optical fiber having ...

Method and device for filament-based white light generation

A method of generating white light pulses ( 2 ) with a white light generation device ( 100 ) includes the steps of coupling pump laser pulses ( 1 ) into a white light generation crystal ( 10 ), generating the white light pulses ( 2 ) by an optically non-linear conversion of the pump laser pulses ( 1 ) in the white light generation crystal ( 10 ) and detecting at least one pulse characteristic of at least one of the pump laser pulses ( 1 ) and the white light pulses ( 2 ), wherein the white light generation device ( 100 ) is controlled using a control loop device ( 30 ) and the white light generation device ( 100 ) is adjusted in dependency on the at least one detected pulse characteristic. Furthermore, a white light generation device ( 100 ) for generating white light pulses ( 2 ) is described.

ARBITRARY PULSE SHAPING WITH PICOSECOND RESOLUTION OVER MULTIPLE-NANOSECOND RECORDS

The present invention extends the resolution capability for shaping optical pulses on laser systems from the current state of the art resolution of ˜250 ps to ˜1 ps by utilizing a hybrid of EOM and spectral shaping technologies. In one embodiment, a short pulse derived from a mode-locked laser oscillator is dispersed using a dispersive stretcher to about 250 ps, providing a linear mapping of spectrum to time. A typical spectral shaper is used to directly write the desired temporal pattern in the spectral domain to produce a crudely patterned waveform that may also suffer from chirp. The chirp is removed by a process known as difference frequency generation by mixing it with a pulse derived from an equally chirped frequency-doubled pump in an optical parametric amplifier. The pattern is then focused in time, which is accomplished in one embodiment by propagating the pattern through a dispersive element. 1. An apparatus , comprising:a source for providing a coherent short duration laser pulse;a stretcher to disperse the time domain of said pulse to produce a chirped pulse;means for applying a desired temporal pattern in the spectral domain of said chirped pulse to produce an unfocused shaped pulse;means for removing the chirp from said unfocused shaped pulse to produce an unchirped shaped pulse; andmeans for focusing in the time domain said unchirped unfocused shaped pulse to produce a focused shaped pulse.2. The apparatus of claim 1 , wherein said short duration laser pulse is transform limited.3. The apparatus of claim 1 , wherein said short duration claim 1 , laser pulse is near transform limited.4. The apparatus of . claim 1 , wherein the pulse-width of said laser pulse is smaller than the finest feature desired on the temporal waveform of said focused shaped pulse.5. The apparatus of claim 1 , wherein the duration of said laser pulse is less than one picosecond.6. The apparatus of claim 1 , wherein the duration of said laser pulse is much less than one picosecond ...

PULSED ELECTROMAGNETIC-WAVE GENERATOR AND MEASURING APPARATUS

A pulsed electromagnetic-wave generator includes an excitation light source, a laser resonator, a pulse generating unit, and a wavelength converting unit. Excitation light from the excitation light source enters the laser resonator. The pulse generating unit is configured to generate a pulsed light group including at least two or more pulses with different frequencies (ω) and different oscillation timings (t) in one excitation process of the excitation light source, an oscillation frequency difference (Δω) between the pulses in the pulsed light group being an integral multiple of a Free Spectral Range (FSR) of the laser resonator. The pulsed light group enters the wavelength converting unit. The wavelength converting unit is configured to generate a pulsed electromagnetic wave in which a wavelength of each pulse in the pulsed light group is converted. 1. A pulsed electromagnetic-wave generator comprising:an excitation light source;a laser resonator which excitation light from the excitation light source enters;a pulse generating unit configured to generate a pulsed light group including at least two or more pulses with different frequencies (ω) and different oscillation timings (t) in one excitation process of the excitation light source, an oscillation frequency difference (Aw) between the pulses in the pulsed light group being an integral multiple of a Free Spectral Range (FSR) of the laser resonator; anda wavelength converting unit which the pulsed light group enters, and that is configured to generate a pulsed electromagnetic wave in which a wavelength of each pulse in the pulsed light group is converted.2. The pulsed electromagnetic-wave generator according to claim 1 , whereinthe pulse generating unit is a Q-switch device.3. The pulsed electromagnetic-wave generator according to claim 1 , wherein a laser light source configured to oscillate a laser beam of a frequency different from the pulse generating unit; and', 'a wavelength converting device configured to ...