МНОГОЛУЧЕВАЯ ЛАЗЕРНАЯ СИСТЕМА И СПОСОБЫ СВАРКИ

Изобретение относится к лазерной системе с многолучевым выходным излучением (варианты) и способу сварки заготовок. Система представляет мультиволоконную лазерную систему, подающую выходное излучение по меньшей мере по трем волокнам, расположенным по окружности или же выходное излучение по меньшей мере четырех отдельных лазеров из одного рабочего кабеля. Изобретение позволяет управлять по меньшей мере тремя лазерными модулями и подавать, соответственно, их выходное излучение в заранее заданной последовательности внутри одного рабочего кабеля, обеспечивая таким образом множество стадий обработки заготовки, которая ранее требовала отдельной оптической системы для каждого луча. Выходное излучение по меньшей мере трех лазеров оптимизировано для применения в создании точечных сварных соединений, шовных сварных соединений или виртуальных осцилляционных сварных соединений при использовании для шовной сварки. 3 н. и 17 з.п. ф-лы, 10 ил.

ФЕМТОСЕКУНДНЫЙ ЛАЗЕР ВЫСОКОЙ МОЩНОСТИ С ЧАСТОТОЙ ПОВТОРЕНИЯ, РЕГУЛИРУЕМОЙ СОГЛАСНО СКОРОСТИ СКАНИРОВАНИЯ

Изобретение относится к области лазерной техники. Способ сканирования с помощью лазерной системы содержит этапы, на которых: генерируют фемтосекундные затравочные импульсы с помощью генератора, увеличивают длительность затравочных импульсов с помощью модуля растяжения, усиливают растянутые затравочные импульсы с образованием лазерных импульсов с помощью усилителя, компенсируют дисперсию групповой задержки лазерных импульсов в диапазоне 5,000-20,000 фс² с помощью компенсатора дисперсии между торцевыми зеркалами усилителя. Выводят лазерные импульсы из усилителя с помощью оптического переключателя при первой частоте повторения, уменьшают длительность лазерных импульсов в диапазоне 1-1,000 фс с помощью модуля сжатия, фокусируют лазерные импульсы в фокальное пятно в первой области мишени с помощью системы доставки сканирующего лазерного пучка. При этом осуществляют сканирование фокальным пятном с первой частотой повторения в первой области мишени с помощью системы доставки сканирующего лазерного ...

ФОКУСИРОВКА ЛАЗЕРНОГО ИМПУЛЬСА

Изобретение относится к области лазерной техники и касается системы формирования лазерного излучения. Система включает в себя источник импульсного лазерного излучения, оптические элементы, содержащие фокусирующий объектив и выполненные с возможностью изменения длительности лазерных импульсов, устройство контроля, предназначенное для измерения длительности лазерных импульсов и выявления изменения длительности импульса, и управляющий компьютер. Компьютер выполнен с возможностью приема значений длительности импульса, определения параметров лазера, которые компенсируют изменение длительности импульса, и управления источником лазерного излучения в соответствии с одним или более параметров лазера. Устройство контроля выполнено с возможностью соединения с фокусирующим объективом или расположения внутри фокусирующего объектива. Технический результат заключается в увеличении точности настройки длительности лазерных импульсов. 2 н. и 14 з.п. ф-лы, 5 ил.

Способ лазерной маркировки поверхности изделия из алюминия или его сплава с оксидным внешним слоем

Изобретение относится к способу лазерной маркировки изделия из алюминия или его сплава с оксидным внешним слоем и может быть использовано, преимущественно, при изготовлении конструкционных, оптических и электронных элементов, электрических утюгов, бритв, кнопок, в том числе дверных, и т.п. Осуществляют формирование визуально наблюдаемой человеческим зрением маркировки, отличной от смежных с маркировкой областей поверхности изделия, за счет изменения структуры по сравнению с материалом в смежных с маркировкой областях путем воздействия лазерным излучением и последующего охлаждения. Воздействуют лазерным излучением с длиной волны, которую выбирают из условия обеспечения поглощения излучения оксидом алюминия без повреждения поверхности алюминия или его сплава. Осуществляют упрочнение оксидного внешнего слоя с обеспечением закрытия пор в модифицированной и немодифицированной областях оксидного внешнего слоя. Формируют структуру оксидного слоя, отличную от материала в смежных с маркировкой областях ...

СПОСОБ ФОРМИРОВАНИЯ ПАЧЕК ИМПУЛЬСОВ В ОПТИЧЕСКОМ УСИЛИТЕЛЕ С ИМПУЛЬСНОЙ НАКАЧКОЙ

Изобретение относится к области лазерной техники. Способ формирования пачек импульсов в оптическом усилителе с импульсной накачкой характеризуется тем, что излучение от источника оптического излучения с частотой следования импульсов не менее 200 кГц и длительностью импульсов не более 100 пс вводят в активную среду оптического усилителя, который накачивают импульсным лазером, работающим в режиме модуляции добротности или в режиме переключения усиления с частотой следования импульсов не более 1 кГц, при этом длину волны излучения накачки лазера выбирают таким образом, чтобы создать инверсную населенность в активной среде оптического усилителя, а соотношение уровней энергии импульсов лазера накачки оптического усилителя и источника импульсного оптического излучения выбирают таким образом, чтобы обеспечивался режим насыщения по средней мощности усиления оптического усилителя. Технический результат - снижение тепловой нагрузки на образец или обрабатываемый лазерным излучением материал. 1 з.п ...

ФЕМТОСЕКУНДНЫЙ ЛАЗЕР ВЫСОКОЙ МОЩНОСТИ С ЧАСТОТОЙ ПОВТОРЕНИЯ, РЕГУЛИРУЕМОЙ СОГЛАСНО СКОРОСТИ СКАНИРОВАНИЯ

ФОКУСИРОВКА ЛАЗЕРНОГО ИМПУЛЬСА

МНОГОЛУЧЕВАЯ ЛАЗЕРНАЯ СИСТЕМА И СПОСОБЫ СВАРКИ

Verfahren und Vorrichtung zum Betreiben einer Laserlichtquelle

Verfahren zum Betreiben einer Laserlichtquelle (10a) aufweisend die Schritte: a) Zyklisches Ermitteln eines elektrischen Spannungsabfalls an der Laserlichtquelle (10a) durch Bestromen der Laserlichtquelle (10a); b) Zyklisches Ermitteln einer Temperatur der Laserlichtquelle (10a) aus dem ermittelten elektrischen Spannungsabfall mittels eines vorab ermittelten ersten mathematischen Zusammenhangs aus elektrischer Spannung und Temperatur der Laserlichtquelle (10a); c) Ermitteln eines Stroms, der bei jedem ermittelten Temperaturwert eine im Wesentlichen konstante optische Ausgangsleistung der Laserlichtquelle (10a) bewirkt, mittels eines zweiten mathematischen Zusammenhangs aus optischer Ausgangsleistung und Strom; und d) Bestromen der Laserlichtquelle (10a) mit diesem Strom.

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

Vorrichtung zum Umschalten eines Laserstrahls, Laserbearbeitungsvorrichtung

Die Erfindung schafft eine Umschaltvorrichtung zum selektiven Schalten eines linear polarisierten Eingangslaserstrahls (110a) in einen ersten Ausgangslaserstrahl (130a) oder in einen zweiten Ausgangslaserstrahl (160a). Die Umschaltvorrichtung umfasst ein primäres optisches Umschaltelement mit einem primären optischen Element (EOM) zum gezielten Drehen der Polarisationsrichtung des Eingangslaserstrahls (110a) und einem nachgeschalteten primären polarisationsabhängigen Reflektor (R), welcher den Eingangslaserstrahl abhängig von seiner Polarisationsrichtung in einen ersten Strahlengang (120a) oder in einen zweiten Strahlengang (150a) lenkt. In jedem der beiden Strahlengänge (120a bzw. 150a) ist jeweils ein weiteres optisches Umschaltelement mit einem sekundären optischen Element (EOM1 bzw. EOM2) zum gezielten Drehen der Polarisationsrichtung des jeweiligen Laserstrahls (120b bzw. 150b) und mit einem sekundären polarisationsabhängigen Reflektor (R1 bzw. R2) vorgesehen, welcher den jeweiligen ...

Laser systems

Laser medium, laser medium unit, and laser beam amplification device

Light pulse extender having beam divider and two spherical mirrors

A device, for extending the duration of a light pulse, comprises a beam divider 15 having parallel transparent and reflecting elements, two spherical mirrors 11,12 facing each other on an axis 13 and a translation plate 16.

Optical component cleanliness and debris management in laser micromachining applications

Optical component cleanliness and debris management in laser micromachining applications

Preferred embodiments of a purge gas port (74), laser beam attenuating input window (24), and laser shutter (20) constitute subsystems of a UV laser optical system (10) in which a laser beam is completely enclosed to reduce contamination of the optical system components (42, 60, 72). Purge gas is injected through multiple locations in a beam tube assembly (18) to ensure that the optical component surfaces (78) sensitive to contamination are in the flow path of the purge gas. The input window functions as a fixed level attenuator to limit photopolymerization of airborne molecules and particles. Periodically rotating optical elements asymmetrically in their holders (142) reduces burn damage to the optics.

Chirped Bragg grating structure

A Bragg grating has a local reflection strength which varies with position along the length of the grating so as to generate a non-uniform wavelength reflection spectrum, enabling compensation for a non-uniform gain profile of the gain section of a tunable laser. In another aspect, a Bragg comb grating is modulated by an envelope function which can also compensate for a non-uniform gain profile. The comb grating may be a phase change grating, with the envelope function shape being controlled by the length between phase changes and/or size of the phase changes.

Optical transmission apparatus and laser pulse duration expander

An optical transmission apparatus comprising: a beam divider e.g. microlens array 203; fibre-optic bundle having a plurality of optical fibres 209a-d for receiving divided portions of the beam; and a beam combiner e.g. microlens array 211 for combining divided portions of the beam received from the bundle wherein at least two of the optical fibres have different optical path lengths e.g. due to different physical lengths or different refractive indices. The beam 201 may be from a pulsed laser. Also provided is a laser pulse duration expander having such a fibre-optic bundle so that input of a laser pulse with a first pulse duration results in the output of a combined pulse with a second pulse duration greater than the first. The laser may be a Q-switched laser.

Method and apparatus for generating mid and long ir wavelength radiation

Mode-locked laser

A hybrid type passively and actively mode-locked laser comprises two loops (100);(300) coupled together by a coupler (200) in a figure-of-eight configuration. One of the loops (100) is a non-linear amplifying loop of conventional passively mode-locked type, while the other loop (300) includes an optical modulator (330) and an optical gain medium (350) such as an EDF to provide active mode-locking. The loop (300) may include a time delay line (340) for adjusting the laser oscillation repetition rate. The ultra-short optical pulses generated can be applied to high speed time division multiplexed optical communication systems, high speed optical signal processors, and ultrafast optical phenomenon studies.

LASER OSCILLATOR AND LASER PROCESSING APPARATUS

A plurality of condensers 51-1 to 51-3 are arranged in a multistage manner to include a plurality of laser diodes 55-1 to 55-28 which generate excitation light and laser mediums56-1 to 56-3 which absorb the excitation light generated by the laser diodes to thereby emit laser beams. Cooling water that is cooled to a predetermined temperature by a cooler is circulated throughout the condensers through pipes. Valves 72-1 to 72-4 control the amount of cooling water supplied to each of the condensers based on the temperature of each of the condensers, the temperature being measured by an inlet temperature measuring unit 73 and outlet temperature measuring unit 74-1 to 74-3. The present invention can be applied to a laser processing apparatus.

Ion source by matrix-assisted laser desorption/ionization

Method and apparatus for generating optical frequency comb

Disclosed in the present invention are a method and apparatus for generating an optical frequency comb. The specific generation method comprises: receiving pump light matching a thermal stable state of a nonlinear optical resonant cavity to generate oscillation in the nonlinear optical resonant cavity, and enabling a Brillouin gain corresponding to the pump light to coincide with a target longitudinal mode of the nonlinear optical resonant cavity; continuously generating a Brillouin laser at the target longitudinal mode under the condition that the pump power of the pump light exceeds a threshold value for generating the Brillouin laser; and generating the optical frequency comb by means of the Brillouin laser through a Kerr nonlinear four-wave mixing process. According to the technical solution of the present invention, the nonlinear optical resonant cavity with the Brillouin gain can be used for generating the optical frequency comb in a thermal stable region of the nonlinear optical ...

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

PROCEDURE AND RADIATION SOURCE FOR THE PRODUCTION OF THZ RADIATION

Method and apparatus for generating a reference frequency

Verfahren zur Erzeugung einer Referenzfrequenz Df. Erfindungsgemäß ist die Verwendung eines ersten optischen Resonators (3a; 24) und eines zweiten optischen Resonators (25) vorgesehen, wobei wobei der erste Resonator (3a; 24) eine erste Resonatormode mit einer ersten Frequenz f1 aufweist und der zweite Resonator (25) eine zweite Resonatormode mit einer zweiten Frequenz f2, wobei die Frequenzen der beiden Resonatormoden Funktionen eines Betriebsparameters BP sind und die Werte f1 und f2 bei einem vorgegeben Wert BP0 des Betriebsparameters annehmen, sodass f1(BP0)=f1 und f2(BP0)=f2 gilt, wobei die Resonatoren (3a; 24, 25) so ausgelegt werden, dass die erste Ableitung der Frequenzen f1(BP), f2(BP) nach BP oder zumindest ein Differenzenquotient rund um BP0 bis auf eine Abweichung von maximal ±0,1% übereinstimmen, wobei Licht der ersten Frequenz f1 mittels des ersten Resonators auf die erste Frequenz f1 stabilisiert wird und Licht der zweiten Frequenz f2 mittels des zweiten Resonators auf die ...

LASER RESONATOR ARRANGEMENT

Q-switched solid-state laser

Bei einem gütegeschalteten Festkörperlaser mit einem Resonator (3, 30) in Form eines linearen Resonators oder Ringresonators, der ein aktives Lasermaterial (1) und zumindest einen ersten und einen zweiten Spiegel (4, 5) aufweist und der eine Resonatorlänge (a) im Fall der Ausbildung als linearer Resonator von weniger als 50 mm, vorzugsweise weniger als 25 mm, und im Fall der Ausbildung als Ringresonator von weniger als 100 mm, vorzugsweise weniger als 50 mm aufweist schwingt im Resonator (3) zumindest im Wesentlichen nur ein einziger longitudinaler Mode an. Der Resonator (3, 30) ist als instabiler Resonator ausgebildet, wobei einer der Spiegel (4, 5) ein Gradientenspiegel ist.

AUTOMATIC FLUORINE CONCENTRATION EXPENSIVE SYSTEM FOR EXCIMERLASER

SCHMALLBANDIGER LASER ALSO FINELY TUNABLE WAVELENGTH

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

DEVICE FOR THE CONTINUOUS VARIATION OF THE WAVELENGTH OVER WIDENING RANGE WITH A SET OF TUNABLE LASER LIGHT SOURCES

Tunable laser

Wavelength tunable laser

Very narrow band, two chamber, high rep rate gas discharge laser system

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

SEMICONDUCTOR LASER DRIVING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SEMICONDUCTOR LASER DRIVING DEVICE

A semiconductor laser driving device that drives a semiconductor laser with a driving current output from a driving current output terminal is disclosed. The semiconductor laser driving device includes a driving current monitoring terminal configured to output a driving current monitoring current having a value of 1/a of the driving current; a current-voltage conversion resistor connected to the driving current monitoring terminal and configured to convert the driving current monitoring current having the value of 1/a of the driving current into a corresponding driving current monitoring voltage; and a detector configured to generate a reference voltage and detect whether the corresponding driving current monitoring voltage has reached the reference voltage.

SOLID STATE DYE LASER

A solid state dye laser (5) is adapted for use in a solid state dye laser assembly having a pump (2) adapted to emit light at a first frequency and intensity. The solid state dye laser (5) includes an elongated web of polymeric host material having a gain medium disposed therein, the gain medium being in a substantially solid state and doped with a fluorescent dye adapted to emit light within a predetermined spectral tuning range. The gain medium includes polymeric cholesteric liquid crystal disposed in a planar texture and frozen into a characteristic wavelength. The solid state dye laser (5) including the gain medium is adapted for convenient movement relative to the pump (2).

LASER PULSE FOCUSING

In certain embodiments, a system (10) comprises a laser source (20), one or more optical elements (24), a monitoring device (28), and a control computer (30). The laser source (20) emits one or more laser pulses. The optical elements (24) change a pulse length of the laser pulses, and the monitoring device (28) measures the pulse length of the laser pulses to detect the change in the pulse length. The control computer (30) receives the measured pulse length from the monitoring device (28), determines one or more laser parameters that compensate for the change in the pulse length, and controls the laser source (20) according to the laser parameters.

Verfahren zum Modulieren eines Lichtbündels

Process for changing the energy state of particles of one type of isotope and means for making use of the process

An energetic radiation is generated with sufficiently narrow bandwidth for it to be absorbed by one type of isotope and the frequency of the energetic radiation is shifted in an interval including an absorption line for this type of isotope. The means comprise a system for generating the laser radiation with frequency shifting (50) with a continuous-wave laser-effect medium (120) (a dye solution) excited by another laser (122) (argon). The medium (120) has a defined cavity which may contain mode selection or frequency control filters (128). In addition, a crystal (130) which may be an electro-optical element is placed in the path of the laser beam originating from the medium (120) inside the cavity. The crystal (130) is modulated electrically. The modulation produces a change in the refractive index of the crystal (130) corresponding to the applied voltage. The process is applied for selectively photoionising <235>U in relation to the other isotopes of uranium. ...

Recurrence rate controller.

Ein Master-Laser (112) gemäss des Folgefrequenzregelgeräts (1) der vorliegenden Erfindung gibt einen Master-Laserlichtpuls aus, dessen Frequenz auf einen vorher festgelegten Wert geregelt wird. Ein Slave-Laser (212) gibt einen Slave-Laserlichtpuls aus. Ein Referenzkomparator (122, 222) vergleicht eine Spannung eines elektrischen Referenzsignals und eine vorher festgelegte Spannung miteinander, wobei die Folgefrequenz des elektrischen Referenzsignals der vorher festgelegte Wert ist, und gibt dabei ein Ergebnis des Vergleichs aus. Ein Messkomparator (115, 215) vergleicht eine Spannung basierend auf einer Lichtintensität des Slave-Laserlichtpulses und die vorher festgelegte Spannung miteinander und gibt dabei ein Ergebnis des Vergleichs aus. Ein Phasendifferenzdetektor detektiert eine Phasendifferenz zwischen der Ausgabe des Referenzkomparators und der Ausgabe des Messkomparators. Ein Schleifenfilter (134, 234) entfernt eine Hochfrequenzkomponente einer Ausgabe des Phasendifferenzdetektors ...

LASER WITH AN ATTITUDE MECHANISM.

Described is a laser whose output power can be varied by means of an adjustment device (45) with an adjustment element (49) which is switched in by the operator but cuts out automatically. Using a beam splitter (15), part of the laser beam (5) is directed on to a light-sensitive element (17) in order to determine the laser power. The values of the selected and instantaneous output power are indicated on the display (32a, 32b) of a display unit (33). The adjustment element (49) can be switched in using only one hand and, with the adjustment element switched in, the laser power required can be adjusted using only one hand.

OPHTHALMOLOGICAL LASER TREATMENT DEVICE.

An ophthalmological laser treatment device (1) and methods are disclosed, the ophthalmological laser treatment device (1) comprising: a base station (2) having a treatment laser source (21), an application head (3), and an arm (4) configured to provide a beam path for the treatment laser beam; wherein the ophthalmological laser treatment device (1) includes a laser beam monitor (5), a light signal source (6), and a control module (7), the laser beam monitor (5) arranged to receive a light signal generated by the light signal source (6), the light signal having traveled through the arm (4) along the beam path; wherein the control module (7) is configured to control the ophthalmological laser treatment device (1) using signal characteristics of the light signal.

LIGHTING DEVICE

Laser and laser system

SOLID-STATE LASER DEVICE, SOLID-STATE LASER SYSTEM, AND LASER DEVICE FOR LIGHT EXPOSURE DEVICE

Microlaser mosaic image projection

L'invention concerne un dispositif élémentaire de projection d'images, comportant une pluralité de sources microlasers disposées en matrice, chaque source comportant une cavité délimitée par un miroir d'entrée (8) et un miroir de sortie (6), ainsi qu'un milieu actif laser (2) et des moyens (10, 12) pour moduler, en intensité, chaque source microlaser.

RECOMBINATION SYSTEM SPATIAL ULTRA-SHORT LASER PULSES BY A DIFFRACTIVE ELEMENT

DEVICE Of AMPLIFICATION Of a LASER BEAM ALLOWING TO REMOVE the TRANSVERSE LASAGE

L'invention concerne un dispositif d'amplification d'un faisceau laser selon un axe Ox, qui comprend : - une structure de barreau amplificateur (1) d'indice nc délimitée par une surface Σ reliant les faces d'entrée et de sortie de la structure, ayant une dimension e selon la direction Ox et Φ selon une direction perpendiculaire, avec e< Φ, et destinée à être pompée pour devenir un milieu à gain avec un maximum le long d'une face, et - un milieu d'indice nA qui entoure la structure (1) selon sa surface Σ et qui est absorbant ou diffusant à la longueur d'onde de fluorescence λ de la structure de barreau amplificateur, avec nA≠ nc. La surface Σ comporte une première dent (2) sous la forme d'un chanfrein sur tout ou partie de sa jonction avec la face à gain maximal, de manière à éviter de provoquer un lasage transverse parasite.

Selective excitation of siotropes - particularly for enrichment of uranium isotopes with U235

INJECTOR LIGHT ELEMENT

L'invention concerne un élément injecteur de lumière (20) comprenant un corps (21) s'étendant selon un axe longitudinal (22), et une source de lumière (23) placée en regard d'une extrémité (25) du corps (21), la source de lumière (23) comprenant une pluralité de diodes laser à cavité verticale émettant par la surface (VCSEL), ladite pluralité de diodes étant disposées de sorte à former une surface d'émission (26) sensiblement perpendiculaire à l'axe longitudinal (22) du corps (21). L'invention concerne également un photobioréacteur (10) comprenant un tel élément injecteur de lumière (20).

РRОJЕСТЕUR D'IМАGЕS А МОSАIQUЕ DЕ МIСRОLАSЕRS

L'invеntiоn соnсеrnе un dispоsitif élémеntаirе dе prоjесtiоn d'imаgеs, соmpоrtаnt unе plurаlité dе sоurсеs miсrоlаsеrs dispоséеs еn mаtriсе, сhаquе sоurсе соmpоrtаnt unе саvité délimitéе pаr un mirоir d'еntréе (8) еt un mirоir dе sоrtiе (6), аinsi qu'un miliеu асtif lаsеr (2) еt dеs mоуеns (10, 12) pоur mоdulеr, еn intеnsité, сhаquе sоurсе miсrоlаsеr.

DEVICE FOR AMPLIFYING A LASER BEAM WITH SUPRESSION OF TRANSVERSE LASING

LASER WITH HIGH QUALITY, STABLE OUTPUT BEAM, AND LONG LIFE HIGH CONVERSION EFFICIENCY NON­LINEAR CRYSTAL

Laser with high quality, stable output beam, and long life high conversion efficiency non-linear crystal

A mode-locked laser system operable at low temperature can include an annealed, frequency-conversion crystal and a housing to maintain an annealed condition of the crystal during standard operation at the low temperature. In one embodiment, the crystal can have an increased length. First beam shaping optics can be configured to focus a beam from a light source to an elliptical cross section at a beam waist located in or proximate to the crystal. A harmonic separation block can divide an output from the crystal into beams of different frequencies separated in space. In one embodiment, the mode-locked laser system can further include second beam shaping optics configured to convert an elliptical cross section of the desired frequency beam into a beam with a desired aspect ratio, such as a circular cross section.

Direct modulated laser

Tunable laser

Confocal pulse stretcher

External-cavity type laser with built-in wavemeter

The present invention relates to an external cavity type laser provided with a wavemeter capable of precisely measuring a wavelength of a laser beam based on a transmission wavelength band of a wavelength selective filter inserted into a cavity regardless of a driving current of a laser diode chip. The external cavity type laser apparatus includes: a laser diode chip 100 emitting a laser beam; a beam feedback partial reflection mirror 500 reflecting a portion of the beam emitted from the laser diode chip 100 to feed the beam back to the laser diode chip 100; a collimating lens 200 installed on a path of a beam between the laser diode chip 100 and the beam feedback partial reflection mirror 500 to collimate the beam emitted from the laser diode chip 100; a 45-degree partial reflection mirror 300 converting a laser beam moving in parallel with a package bottom surface into a laser beam moving perpendicularly to the package bottom surface; a wavelength selective filter 400 transmitting a beam ...

Solid-state laser device, solid-state laser system, and laser device for exposure device

A solid state laser device includes a seed laser that outputs continuous wave laser seed light, a light intensity changeable unit that changes a light intensity thereof and outputs seed pulse light, a CW excitation laser that outputs continuous wave excitation light, an amplifier that amplifies the seed pulse light and outputs amplified light based on an amplification gain increased by the excitation light, a wavelength conversion unit that converts a wavelength of the amplified light and outputs harmonic light, and a light intensity control unit that allows the light intensity changeable unit to output the seed pulse light after a certain time elapsed from an input of an external trigger signal each time the signal is input and output suppression light that suppresses an increase of the amplification gain in a period after an output of the seed pulse light until an input of a next external trigger signal.

TUNABLE LASER MODULE BASED ON POLYMER WAVEGUIDES

The present invention relates to a laser module based on a waveguide tunable in a broad wavelength band. More specifically, the laser module comprises: a broadband light source based on an external resonator that generates optical signals; a waveguide; at least one Bragg grating formed on the waveguide; an optical lens provided between the light source and the waveguide; a first temperature controlling device configured of a thin film heater; and a second temperature controlling device that includes a temperature sensor and a thermoelectric cooler, wherein the light output from the light source being condensed through the optical lens and input to the waveguide, and a reflecting band of the Bragg grating is controlled by a thermo-optic effect, and an oscillation wavelength is controlled by a second temperature controlling device independently of external temperature environment.

Pulsed laser sources

Various embodiments include modelocked fiber laser resonators that may be coupled with optical amplifiers. An isolator may separate the laser resonator from the amplifier, although certain embodiments exclude such an isolator. A reflective optical element on one end of the resonator having a relatively low reflectivity may be employed to couple light from the laser resonator to the amplifier. Enhanced pulse-width control may be provided with concatenated sections of both polarization-maintaining and non-polarization-maintaining fibers. Apodized fiber Bragg gratings and integrated fiber polarizers may be also be included in the laser cavity to assist in linearly polarizing the output of the cavity. Very short pulses with a large optical bandwidth may be obtained by matching the dispersion value of the fiber Bragg grating to the inverse of the dispersion of the intra-cavity fiber. Frequency comb sources may be constructed from such modelocked fiber oscillators. In various exemplary embodiments ...

Multiple wavelength laser system

A laser system having plural optical paths, each with a dielectric mirror for extracting a different wavelength of light from a laser beam, and a laser medium movable with respect to the different optical paths for injecting the laser beam into a desired optical path. The laser medium is mounted to a motor driven carriage for moving the laser medium with respect to the different optical paths.

Optical frequency synthesizer

An optical frequency synthesizer controls a tunable laser to output signals having specific wavelengths. The synthesizer includes a wavelength discriminating device, a wavelength tuning device and a phase locked loop (PLL) circuit. The wavelength discriminating device receives a sample of the signals outputted by the tunable laser, processes the sample signals and passes the processed sample signals to the PLL circuit. Based on the processed sample signals, the PLL circuit controls the wavelength tuning device to tune the laser to output the signals having specific wavelengths.

Tunable laser with wavelength locking

A laser system including a controller for monitoring and controlling various functions of a laser assembly. The laser controller may include a wavelength tuning circuit for adjusting and locking the wavelength of the external cavity. To perform various monitoring and control functions, the controller may include circuitry for monitoring various parameters associated with operation of the laser, such as temperature indicating signals and/or signals from light detectors such as photodiodes.

OPTICAL ELEMENT, LASER BEAM OSCILLATION DEVICE AND LASER BEAM AMPLIFYING DEVICE

An optical element 20A which is composed of a light transmission characteristic medium, that has a refractive index higher than a refractive index of air, the optical element causes an incident laser beam to be propagated inside while reflecting the laser beam by a wall surface 20a a plurality of times, the optical element includes an incident window 21 which is located in a part of the wall surface 20a, that is for allowing the laser beam to be incident, an emitting window 22 which is located in a part of the wall surface 20a, that is for allowing the laser beam propagated inside to be emit, and wavelength dispersion compensating units 31 and 32 which are integrally located in parts of the medium, the wavelength dispersion compensating units compensate for wavelength dispersion by causing the laser beam to be transmitted or reflected at least twice.

Wavelength beam combining laser systems with high beam quality factor

In various embodiments, optical repositioners and/or angled dispersive elements are utilized to manipulate portions of an input laser beam emitted by a group of laser emitters in order to form a multi-wavelength output beam having a high beam quality factor.

Semiconductor light emitting devices and methods

A method for producing an optical output, including the following steps: providing first and second electrical signals; providing a bipolar light-emitting transistor device that includes collector, base, and emitter regions; providing a collector electrode coupled with the collector region and an emitter electrode coupled with the emitter region, and coupling electrical potentials with respect to the collector and emitter electrodes; providing an optical coupling in optical communication with the base region; providing first and second base electrodes coupled with the base region; and coupling the first and second electrical signals with the first and second base electrodes, respectively, to produce an optical output emitted from the base region and coupled into the optical coupling, the optical output being a function of the first and second electrical signals.

TANDEM PHOTONIC AMPLIFIER

Embodiments of laser systems advantageously use pulsed optical fiber-based laser source (12) output, the temporal pulse profile of which may be programmed to assume a range of pulse shapes. Pulsed fiber lasers are subject to peak power limits to prevent an onset of undesirable nonlinear effects; therefore, the laser output power of these devices is subsequently amplified in a diode-pumped solid state photonic power amplifier (DPSS-PA) (16). The DPSS PA provides for amplification of the desirable low peak power output of a pulsed fiber master oscillator power amplifier (14) to much higher peak power levels and thereby also effectively increases the available energy per pulse at a specified pulse repetition frequency. The combination of the pulsed fiber master oscillator power amplifier and the diode-pumped solid state power amplifier is referred to as a tandem solid state photonic amplifier (10).

LASER PROCESSING METHOD

A laser processing method of applying a pulsed laser beam to a single crystal substrate to thereby process the single crystal substrate. The laser processing method includes a numerical aperture setting step of setting the numerical aperture (NA) of a focusing lens for focusing the pulsed laser beam so that the value obtained by dividing the numerical aperture (NA) of the focusing lens by the refractive index (N) of the single crystal substrate falls within the range of 0.05 to 0.2, a positioning step of relatively positioning the focusing lens and the single crystal substrate in the direction along the optical axis of the focusing lens so that the focal point of the pulsed laser beam is set at a desired position in the direction along the thickness of the single crystal substrate, and a shield tunnel forming step of applying the pulsed laser beam to the single crystal substrate so as to focus the pulsed laser beam at the focal point set in the single crystal substrate thereby forming a ...

LASER OSCILLATOR, LASER PROCESSING MACHINE, AND STIMULATED RAMAN SCATTERING INHIBITION METHOD

A pulse generation unit (11) generates, based on a power command signal comprising a pulse signal, a driving voltage signal comprising a pulse signal. A laser oscillation module (12) oscillates a laser beam by carrying out, based on the driving voltage signal, a pulse oscillating operation. When the power command signal has a voltage command value corresponding to a laser power greater than a predetermined laser power during a high period, the pulse generation unit (11) modulates, in a pulsed manner, a voltage value of the high period of the driving voltage signal so as to alternately repeat, for a preset period of time from a rising time of the high period of the driving voltage signal, a high state in which the voltage value is maintained and a low state in which the voltage value is lowered by a predetermined voltage value without being lowered to a voltage value of a low period of the driving voltage signal.

LASER DETECTION APPARATUS AND MANUFACTURING METHOD THEREFOR, AND TERMINAL

This application discloses a laser detection apparatus, a method for manufacturing the laser detection apparatus, and a terminal, and belongs to the field of laser detection technologies, for example, light detection and ranging (Lidar). The apparatus includes a multiphase signal generation circuit, an amplifier array, and a laser transmitter array. The amplifier array includes a plurality of first amplifiers, and the laser transmitter array includes a plurality of laser transmitters. A plurality of output ends of the multiphase signal generation circuit are connected to input ends of corresponding first amplifiers, and output ends of the plurality of first amplifiers are connected to corresponding laser transmitters. The multiphase signal generation circuit is configured to generate a plurality of target electrical signals with different phases, each first amplifier is configured to amplify a target electrical signal, and each laser transmitter is configured to transmit a first laser signal ...

СПОСОБ ЛАЗЕРНОЙ ОБРАБОТКИ И УСТРОЙСТВО ОБРАБОТКИ, ОСНОВАННЫЕ НА ОБЫЧНЫХ ВЫЗВАННЫХ ЛАЗЕРОМ ИЗМЕНЕНИЯХ МАТЕРИАЛА

Изобретение относится к способу лазерной обработки, основанный на переходных изменениях в состоянии возбужденного лазером материала, и устройству для осуществления способа. Импульс сверхбыстродействующего лазера, имеющего пикосекундную или более короткую длительность импульса, связывают по времени и в пространстве с импульсом, по меньшей мере, одного вспомогательного лазера, отличающегося от сверхбыстродействующего лазера. Импульсом вспомогательного лазера управляют так, чтобы он изменялся во времени, причем состояние материала, подлежащего обработке, изменяют обратимым образом с помощью одного вспомогательного лазерного луча и изменяют необратимым образом, когда луч вспомогательного лазера и луч сверхбыстродействующего лазера связаны по времени и в пространстве. Вспомогательный лазерный генератор включает в себя электронное устройство связи, которое изменяет импульс лазерного луча во времени, и фокусирующую оптическую систему для пространственного связывания точки фокуса луча сверхбыстродействующего ...

Волоконный кольцевой источник лазерного излучения с пассивным сканированием частоты

Изобретение относится к лазерной технике, к волоконным одночастотным лазерам с пассивным сканированием частоты. Предложенное изобретение отличается от известного тем, что включает хотя бы один узел контроля излучения генерации, размещенный между узлом разделения усиленного излучения и излучения генерации, и узлом ввода накачивающего излучения по ходу направления распространения усиленного оптического излучения, хотя бы один узел контроля усиленного излучения, который размещен между волоконным оптическим изолятором и узлом разделения усиленного излучения и излучения генерации, плотным зеркалом, которое выполнено с коэффициентом отражения более 50% и размещено в конце линейной части волоконного кольцевого источника лазерного излучения с пассивным сканированием частоты, а второе активное оптическое волокно выполнено с интегральным поглощением лазерного излучения не менее 40 дБ, при этом первое активное оптическое волокно выполнено с коэффициентом интегрального усиления лазерного излучения ...

Способ и устройство проецирования изображения с лазерным усилением яркости

Группа изобретений относится к лазерной технике. Устройство, реализующее способ проецирования изображений с лазерным усилением яркости, содержит лазерный активный элемент с системой накачки, с одной стороны которого расположены проецируемый объект и фокусирующая оптическая система, а с другой стороны - проекционный объектив. Между лазерным активным элементом и проекционным объективом дополнительно установлен, по крайней мере, один лазерный активный элемент с системой накачки. Дополнительно введен блок синхронизации времени возбуждения лазерных активных элементов, соединенный с системами их накачки. Технический результат заключается в повышении яркости и контрастности проецируемого изображения. 2 н. и 4 з.п. ф-лы, 3 ил.

ЦЕПЬ УСИЛЕНИЯ С ИЗМЕНЕНИЕМ ЧАСТОТЫ И С НЕСКОЛЬКИМИ ВЫХОДАМИ

Лазерный источник мощного излучения среднего ИК-диапазона на основе кольцевого параметрического генератора на кристалле ZGP с высокой частотой импульса

Изобретение относится к лазерной технике. Устройство включает в себя источник накачки на основе тулиевого волоконного лазера, лазер на кристалле Ho3+:YAG и кольцевой 4-зеркальный параметрический генератор света (ПГС) на основе нелинейно-оптического кристалла ZGP. В тулиевом волоконном лазере осуществляют управление током накачки, а внутри резонатора лазера на кристалле Ho3+:YAG используют акустооптический модулятор, что обеспечивает формирование импульсно-периодической последовательности пачек генерации с высокочастотным заполнением. Кольцевой резонатор ПГС формируется диэлектрическими зеркалами с отражением только для сигнальной волны, оптическая схема которого обеспечивает хорошее согласование пространственных структур моды генерации и пучка накачки. Технический результат - получение излучения среднего ИК диапазона в пучках высокого качества с высокой частотой следования импульсов при высокой энергии в импульсах и стабильности их амплитуды. 2 ил.

WIEDERGABESTEUERUNG IN FORM EINES ABLATIERTEN LASERMERKMALS

Steuervorrichtung für Laserdiode

Vorrichtungen zum Stabilisieren der Träger-Einhüllenden-Phase (Carrier-Envelope Phase) eines Laserimpulses durch Benutzen des Direkt-Lock-Verfahrens

Gepulster Laser.

Laserquelle mit externer Modulation für Mehrfachstrahlbeleuchtung

Laserbestrahlungsverfahren und Laserbestrahlungsvorrichtung und Herstellungsverfahren für eine Halbleitervorrichtung

Gepulste Laserquellen

Frequenzkammquelle (800), zur Erzeugung eines Frequenzkamms, wobei die Frequenzkammquelle umfasst:einen modengekoppelten Faseroszillator (801) mit einer resonanten Kavität, die eine optische Faser mit einer Länge L aufweist, und mit reflektierenden Elementen an den Enden, wobei die resonante Kavität mehrere optische Moden unterstützt und der modengekoppelte Faseroszillator (801) die mehreren optischen Moden modenkoppelt,um ein modengekoppeltes optisches Signal zu erzeugen, wobei das modengekoppelte optische Signal Frequenzkomponenten des Kamms aufweist, die um einen Frequenzabstand fgetrennt und von Null um eine Trägereinhüllende-Offset-Frequenz fversetzt sind;ein Rückkopplungssystem (819) zum Steuern und Stabilisieren der Offset-Frequenz, f, und des Frequenzabstands fdes modengekoppelten Faseroszillators (801) in Reaktion auf ein Rückkopplungssignal, das für eine Schwebungssignalfrequenz repräsentativ ist;eine stark nicht lineare optische Faser (805), die dem modengekoppelten Faseroszillator ...

Simultaneously mode-locked, Q-switched laser

Laser medium, laser medium unit, and laser beam amplification device

High voltage switch with adjustable current

The present disclosure relates to a high voltage switch which may comprise a chain of MOS field-effect transistors (MOSFETs). The current of the individual MOSFETS, and hence the chain, can be controlled by means of adding a current measuring resistance into the source path of the transistors and transmitting the voltage arising there via a capacitor to a gate connector of the transistors.

Пространственный фильтр для мощных многокаскадных лазерных усилителей

Полезная модель относится к оптическому приборостроению, к лазерным многокаскадным усилителям для создания сверхсильных полей, в частности к пространственным фильтрам.Пространственный фильтр для мощных многокаскадных лазерных усилителей содержит вакуумированный корпус, две фокусирующие линзы, подвижную диафрагму. Для контроля положения подвижной диафрагмы в режиме юстировки предусмотрено смотровое юстировочное окно. Внутри вакуумированного корпуса вблизи от смотрового юстировочного окна размещена заслонка, выполненная из вакуумного оптически непрозрачного материала, эффективная площадь которой превышает апертуру смотрового юстировочного окна. Заслонка закреплена на вакуумированном корпусе с помощью цилиндрического шарнирного механизма. С помощью второго цилиндрического шарнирного механизма соединена со свободным концом штока механизма линейного перемещения с сильфонным вводом. В одном крайнем положении заслонка расположена в горизонтальном положении, соответствующем режиму юстировки, а в другом крайнем положении заслонка расположена в вертикальном положении, плотно закрывая просвет смотрового юстировочного окна, что соответствует рабочему режиму пространственного фильтра.Это позволяет обеспечить защиту системы видеомониторинга от мощных вспышек и защиту смотрового юстировочного окна от загрязнения в результате абляции материала подвижной диафрагмы в рабочем режиме. 3 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 188 876 U1 (51) МПК G02B 27/46 (2006.01) H01S 3/10 (2006.01) G12B 17/08 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК G02B 27/46 (2019.02); H01S 3/10 (2019.02); G12B 17/08 (2019.02) (21) (22) Заявка: 2018146095, 25.12.2018 (24) Дата начала отсчета срока действия патента: 25.12.2018 25.04.2019 Приоритет(ы): (22) Дата подачи заявки: 25.12.2018 (45) Опубликовано: 25.04.2019 Бюл. № 12 Адрес для переписки: 603950, г. Нижний Новгород, Бокс-120, ул. Ульянова, 46, ИПФ РАН (56) Список документов, ...

Optical amplifier and transmission loss measurement method

An optical amplifier that amplifies signal light with Raman amplification in the Raman amplification medium. The optical amplifier includes a light source that supplies pump light into the Raman amplification medium, a first detector that detects input power of the pump light to be input to the Raman amplification medium, a second detector that detects output power of the pump light output from the Raman amplification medium, and a processor operable to calculate transmission loss of the pump light in the Raman amplification medium by comparing the input power with the output power, and calculate transmission loss of the signal light in the Raman amplification medium based on the transmission loss of pump light corrected based on a wavelength of the signal light and a wavelength of the pump light.

Laser device

Disclosed is a laser device. The laser device includes a pulse generator which irradiates a laser beam between a high reflector mirror and an output coupler mirror to amplify and resonate the laser beam, a pulse output section which receives a laser beam pulse amplified and resonated through the output coupler mirror to output the laser beam pulse, and a Q switch which moves backward or forward in a direction perpendicular to a path of the laser beam formed between the pulse generator and the high reflector mirror. The output coupler mirror includes first and second mirrors provided on a base plate. Positions of the first and second mirrors are selectively changed as the Q switch moves backward or forward.

Single longitudinal mode fiber laser apparatus

The present invention provides a single frequency fiber laser apparatus. The fiber laser apparatus includes a Faraday rotator mirror. A piece of erbium doped fiber is inside the laser cavity. A wavelength selective coupler is connected to the erbium doped fiber. A pump source is coupled via the wavelength selective coupler. At least one sub-ring cavity component and/or an absorb component are inserted into the cavity for facilitating suppressing laser side modes to create a single longitudinal mode fiber laser. A partial reflectance fiber Bragg grating (FBG) is used as the front cavity end for this fiber laser.

Passively mode-locked picosecond laser device

A passively mode-locked picosecond laser device comprising a pump source, a laser crystal, a laser cavity, a mode-locked output structure is provided. In the device, the pump source is placed at the side of the incident end surface of the laser crystal; the laser cavity includes a plane reflective mirror and a first plano-concave mirror, the reflective mirror is placed opposite to the concave surface of the plano-concave mirror and located on the position of the focal radius of the plano-concave mirror. The normal direction of the reflective mirror and the axis of the plano-concave mirror form a small angle therebetween; the laser generated from the laser crystal oscillates in the laser cavity, and output through the mode-locked output structure. The device uses a stable cavity design of the equivalent confocal cavity, which can increase the optical path, reduce the repetition frequency, and significantly reduce the cavity length and volume.

Optical amplification device, communication system, and amplification method

According to an aspect of the invention, an amplification device includes an amplifier configured to amplify a signal light by inputting the signal light and an excitation light to a rare-earth doped amplification medium, a wavelength arrangement monitor configured to acquire wavelength arrangement information indicating a wavelength of the signal light, and a light power controller configured to control power of the input excitation light based on the acquired wavelength arrangement information.

Intra-cavity second harmonic generation (shg) laser device

A laser device for intra-cavity frequency conversion, in particular, for the second harmonic generation, the device comprising a laser cavity, formed by the first and the second laser cavity end reflectors wherein the said laser cavity end reflectors are highly reflective for the radiation about the laser fundamental frequency and as such provide for a predetermined level of circulating inside the cavity fundamental frequency power; an active medium provided within the said laser cavity; at least one non-linear crystal, in particular, for the second harmonic generation provided within the same laser cavity; tuning means adapted for tuning at least one of laser cavity end reflectors; wherein at least one of the laser cavity end reflectors comprises an interferometric layout providing spectrally selective reflection for the radiation about the laser fundamental frequency with the value of reflectivity nearly to 100% within a spectral range close to the free spectrum range of the laser cavity and with a sufficiently lower reflectivity outside the above spectral range such that the laser cavity restricts the spectrum of the laser radiation to a single longitudinal mode.

Intra-cavity optical parametric oscillator

An optical parametric oscillator comprising: an optical cavity; a semiconductor gain-medium located within the optical cavity, such that together they form a semiconductor laser, and a nonlinear material located within the cavity such that the nonlinear material continuously generates down-converted idler- and signal-waves in response to a pump-wave continuously generated by the semiconductor gain-medium, wherein the pump wave is resonant within the optical cavity and one or other but not both of the down-converted waves is resonant within the pump wave cavity or a further optical cavity. Brewster plates ensure singly resonant optical parametric oscillators and a birefringent filer is used for frequency setting. Coupled cavities allow for setting the photon lifetime in the cavity that relaxation oscillations are prevented.

Laser vibration sensor, system and method

A laser vibration sensor, system and method of vibration sensing employ a nanostructured resonance interactor. The sensor includes a resonator cavity of a laser and the nanostructured resonance interactor. The resonator cavity has a resonance deterministic of a characteristic of an output signal of the laser. The nanostructured resonance interactor modulates the resonance of the resonator cavity in response to a vibration. A change in the output signal characteristic induced by a resonance modulation is representative of the vibration. The system further includes an output signal detector. The method includes modulating a resonance characteristic of the resonator cavity using a nanostructure that responds to the vibration being sensed.

Method and system for optical conversion

A cA crystal configured to change a frequency of a laser through an optical parametric oscillation (OPO) process and a difference frequency generation (DFG) process is provides. The crystal includes: an OPO/DFG segment that is quasi-periodically poled to yield (i) a conversion of a pump light applied thereto, to a first signal and an idler, and (ii) a conversion of a first signal applied thereto, to a second signal and to an idler signal, by phase-matching a difference frequency generation (DFG) process and an OPO process therein simultaneously, wherein the pump light has a frequency that equals a sum of a frequency of the first signal and a frequency of the idler and wherein the frequency of the first signal equals a sum of a frequency of the second signal and the frequency of idler.

Actively Mode Locked Laser Swept Source for OCT Medical Imaging

An optical coherence analysis system uses a laser swept source that is constrained to operate in a mode locked condition. This is accomplished by synchronously changing the laser cavity's gain and/or phase based on the round trip travel time of light in the cavity. This improves high speed tuning by taking advantage of frequency shifting mechanisms within the cavity and avoids chaotic laser behavior.

Repetition frequency control device

According to the repetition frequency control device, a master laser outputs a master laser light pulse the repetition frequency of which is controlled to a predetermined value. A slave laser outputs a slave laser light pulse. A reference comparator compares a voltage of a reference electric signal the repetition frequency of which is the predetermined value and a predetermined voltage with each other, thereby outputting a result thereof. A measurement comparator compares a voltage based on a light intensity of the slave laser light pulse and the predetermined voltage with each other, thereby outputting a result thereof. A phase difference detector detects a phase difference between the output from the reference comparator and the output from the measurement comparator. A loop filter removes a high-frequency component of an output from the phase difference detector.

Remotely Induced Atmospheric Lasing

A laser pulse from an ultrashort pulse laser (USPL) is fired into the atmosphere. The USPL pulse is configured to generate a plasma filament at a predefined target in the atmosphere, in which free, or “seed,” electrons are generated by multi-photon or tunneling ionization of the air molecules in the filament. A second pulse is fired into the atmosphere to form a heater beam that impinges on the plasma filament and thermalizes the seed electrons within the plasma filament, leading to the collisional excitation of the electrons in the filament. The excited electrons collisionally excite various electronic and vibrational states of the air molecules in the filament, causing population inversions and lasing, e.g., exciting the C 3 Π u →B 3 Π g (v=0→0) transition of the N 2 in the atmosphere to cause lasing at 337 nm.

Laparoscopic Laser Device and Method

Laser radiation delivered to a treatment area may be used with a smoke suppressing irrigant. A laparoscopic laser device may include an elongate body adapted for insertion into an insufflated bodily cavity. A laser energy delivery element, at the distal end of the elongate body, may be coupleable to a source of tissue-vaporization-capable laser energy and capable of delivering laser energy along a laser energy path extending away from the laser energy delivery element. A smoke-suppressing liquid may be directed generally along the laser energy path. A remote visualization device may be used to view along the laser energy path. The laser energy path can be shrouded with a circumferentially extending suction manifold so that liquid can be suctioned from the target site and away from the laser energy path. In some examples, the suction manifold is an axially extendable and contractible suction manifold.

Laser characterization system and process

A system and process for automatically characterizing a plurality of external cavity semiconductor laser chips on a semiconductor laser bar separated from a semiconductor wafer. The system includes a diffraction grating and a steering mirror mounted on a rotary stage for rotating the diffraction grating through a range of diffraction angles. A laser bar positioning stage for automatically aligning each laser chip in a laser bar with the diffraction grating. Reflecting a laser beam emitted from a laser chip in a laser bar with diffraction grating and steering mirror to the laser analyzer. Automatically rotating the diffraction grating through a range of diffraction angles relative to the laser beam and automatically characterizing the laser optical properties such as spectra, power, or spatial modes with the laser analyzer at each diffraction angle.

Optical Source with Remote Optical Head Outputting High Power Short Optical Pulses

An optical source can include a remote optical head for outputting high power short optical pulses. The optical source can include signal source operable to output short optical pulses; an optical pump light source; an optical head provided at a location remote from the location of the optical signal source; and an optical fibre amplifier having at least its optical output located within the optical head. The source can also include an optical signal delivery fibre arranged to deliver optical pulses from the optical signal source to the optical fibre amplifier and a pump light delivery fibre arranged to deliver optical pump light to the high power optical fibre amplifier. In use short optical pulses of a first optical power are delivered to the optical fibre amplifier and are amplified therein to a higher optical power for output from the optical head

Pulsed light generation method

The present invention relates to a method of enabling generation of pulsed lights each having a narrow pulse width and high effective pulse energys. A pulse light source has a MOPA structure, and comprises a single semiconductor laser, a bandpass filter and an optical fiber amplifier. The single semiconductor laser outputs two or more pulsed lights separated by a predetermined interval, for each period given according to a predetermined repetition frequency. The bandpass filter attenuates one of the shorter wavelength side and the longer wavelength side, in the wavelength band of input pulsed lights.

Compact optical frequency comb systems

Compact optical frequency sources are described. The comb source may include an intra-cavity optical element having a multi-material integrated structure with an electrically controllable active region. The active region may comprise a thin film. By way of example, the thin film and an insulating dielectric material disposed between two electrodes can provide for rapid loss modulation. In some embodiments the thin film may comprise graphene. In various embodiments of a frequency comb laser, rapid modulation of the CEO frequency can be implemented via electric modulation of the transmission or reflection loss of an additional optical element, which can be the saturable absorber itself. In another embodiment, the thin film can also be used as a saturable absorber in order to facilitate passive modelocking. In some implementations the optical element may be formed on a cleaved or polished end of an optical fiber.

Apparatus for adjusting polarization characteristics, and ultra-short ultra-high intensity pulse laser generator comprising same

The present invention relates to an apparatus for generating an ultra-short ultra-high intensity pulse laser, comprising: a pulse laser providing unit which generates an ultra-short ultra-high intensity pulse laser, stretches pulse width, then selects and provides only a pulse laser having a predetermined polarizing angle; a polarization characteristic adjusting unit which divides the pulse laser provided by the pulse laser providing unit into S-polarizing component light and P-polarizing component light, varies the phase difference and amplitude difference between the S-polarizing component light and the P-polarizing component light, and combines the two types of light to generate a pulse laser with varied polarization characteristics; and a pulse compression unit which compresses the pulse width of the pulse laser, the polarization characteristics of which are varied by the polarization characteristic adjusting unit, and outputs the pulse laser.

Fiber laser device

A laser diode driving device ( 1 ) of the present invention includes: a variable DC power supply ( 3 ) for outputting a voltage for driving laser diodes (LD1 to LDn); a current driving element ( 4 ) for causing a current If to flow; a current control section ( 5 ) for controlling (i) turning on and off of the current driving element ( 4 ) and (ii) the amount of the current If; and a power supply control section ( 7 ) for controlling an output voltage of the variable DC power supply ( 3 ). The power supply control section ( 7 ) controls, on the basis of If-Vf characteristic data (D 2 ), voltage drop characteristic data (D 3 ), and Vds setting data (D 4 ) all stored in a memory section ( 8 ), the output voltage of the variable DC power supply ( 3 ) so that the current driving element ( 4 ) has a constant inter-terminal voltage regardless of the amount of the current If.

Pulse fiber laser device

A pulse fiber laser device 1 has a Fabry-Perot type optical resonator, and is provided with an excitation light source 11 , an optical coupling unit 12 , an amplifying optical fiber 13 , a saturable absorber 14 , a gradient index lens 15 , an optical output unit 16 , a dispersion adjusting unit 17 , a mirror 21 and a mirror 22 . The saturable absorber 14 and the mirror 21 , integrated into one body, constitute a saturable absorber mirror 23 . The gradient index lens 15 converges the light output from an end face of an optical fiber 32 and outputs the light to the saturable absorber mirror 23 , and inputs the light reflected from the saturable absorber mirror 23 into the end face of the optical fiber 32 . Thus, there is provided a pulse fiber laser device that enables easy adjustment of the intensity of light incident on a saturable absorber and facilitates miniaturization.

Gas laser apparatus equipped with power calculation unit

Disclosed is a gas laser apparatus having: a first estimation unit which calculates an estimate of input power to the laser power supply device by using the output current value and output voltage value of the DC power supply unit and also using the efficiency of conversion from input power to output power by the DC power supply unit; a second estimation unit which calculates an estimate of input power to the driving device by using the output current value of the driving device; and a power calculation unit which calculates the power consumption value of the gas laser apparatus, based on the estimate of the input power to the laser power supply device and the estimate of the input power to the driving device.

Frequency-chirped semiconductor diode laser phase-locked optical system

A chirped diode laser (ChDL) is employed for seeding optical amplifiers and/or dissimilar optical paths, which simultaneously suppresses stimulated Brillouin scattering (SBS) and enables coherent combination. The seed spectrum will appear broadband to suppress the SBS, but the well-defined chirp will have the coherence and duration to allow the active phasing of multiple amplifiers and/or dissimilar optical paths. The phasing is accomplished without optical path-length matching by interfering each amplifier output with a reference, processing the resulting signal with a phase lock loop, and using the error signal to drive an acousto-optic frequency shifter at the front end of each optical amplifier and/or optical path.

LASER DEVICE

A laser device that can prevent abnormal oscillations in the amplifier is provided. 1. A laser device comprising:a light source configured to output light to be amplified;a pumping unit;an amplifier configured to amplify the light to be amplified with an amplification medium pumped by the pumping unit;a monitor unit configured to monitor an intensity of light output from the amplifier, the monitor unit being provided between the light source and the amplifier; anda light source controller configured to control the light source,wherein, when the light input to the monitor unit has an intensity equal to or higher than a predetermined intensity while the light to be amplified is input to the amplifier, the light source controller forces to output the light to be amplified from the light source.2. The laser device according to claim 1 , whereinthe light source outputs pulsed light to be amplified in constant cycles, and,when the light input to the monitor unit has an intensity equal to or higher than the predetermined intensity, the light source controller shortens the cycles in which the light to be amplified is output, to forces to output the light to be amplified from the light source.3. The laser device according to claim 1 , further comprising a pumping controller configured to control the pumping unit claim 1 ,wherein, when the light input to the monitor unit has an intensity equal to or higher than the predetermined intensity, the pumping controller controls the pumping unit to lower a level of a pumped state of the amplification medium.4. The laser device according to claim 3 , wherein claim 3 ,when the light input to the monitor unit has an intensity equal to or higher than the predetermined intensity, the pumping controller stops the pumping unit.5. The laser device according to claim 1 , whereinthe pumping unit is a pumping light source configured to output pumping light, andthe amplifier is an amplification optical fiber through which the light to be ...

LASER DEVICE, LASER APPARATUS, AND EXTREME ULTRAVIOLET LIGHT GENERATION SYSTEM

A laser device having master oscillators that output seed beams is provided. The seed beams are guided from the master oscillators to a regenerative amplifier such that at least one of the seed beams enters the regenerative amplifier at an angle that differs from an angle at which another seed beam enters the regenerative amplifier. A laser apparatus and an extreme ultraviolet light generation system using the laser device are also provided. 1. A laser device , comprising:master oscillators, each of the master oscillators being configured to output a seed beam;a regenerative amplifier for amplifying seed beams from the respective master oscillators; andan optical system configured to guide the seed beams from the master oscillators to the regenerative amplifier, such that at least one of the seed beams enters the regenerative amplifier at an angle that differs from an angle at which another seed beam enters the regenerative amplifier.2. The laser device according to claim 1 , wherein the optical system is configured to guide at least one of the seed beams to the regenerative amplifier at an angle inclined with respect to a designed input axis of the regenerative amplifier.3. The laser device according to claim 1 , wherein the optical system is configured to guide at least one of the seed beams to the regenerative amplifier at a position offset from the center of an input position of the regenerative amplifier.4. The laser device according to claim 1 , wherein the optical system includes at least one reflective optical element positioned to reflect at least one of the seed beams toward the regenerative amplifier.5. The laser device according to claim 1 , wherein the optical system includes at least one refractive optical element positioned to refract at least one of the seed beams toward the regenerative amplifier.6. The laser device according to claim 1 , wherein the optical system includes a waveguide for guiding at least one of the seed beams toward the ...

METHOD TO CONTROL EMISSION WAVELENGTH OF TUNABLE LASER DIODE

A method to control the emission wavelength of a tunable laser diode (LD) is disclosed. The method measures the first derivative of the wavelength against the first stimulus, typically a current injected in the SG-DFB region, and the second derivative of the wavelength against the power supplied to the heater in the CSG-DBR region. The method adjusts the current so as to coincide the emission wavelength with the target wavelength, then, corrects the target power for the heater based on the derivative of the current multiplied by a ratio of two derivatives measured in advance to the control of the heater current. 1. A method to control an emission wavelength of a tunable LD that provides a first region attributed to tune the emission wavelength by a first stimulus and a second region attributed to tune the emission wavelength by a second stimulus , comprising steps of:calculating a first derivative of the emission wavelength against the first stimulus supplied to the first region and a second derivative of the emission wavelength against the second stimulus supplied to the second region;adjusting the first stimulus by a first deviation to coincide the emission wavelength with a target wavelength;adjusting a target stimulus for the second stimulus based on the first deviation of the first stimulus, the first derivative and the second derivative; andadjusting the second stimulus by a second deviation to coincide with the second stimulus with the target stimulus.2. The method of claim 1 ,wherein the adjustment of the first stimulus is done by a first path and the adjustment of the second stimulus is done by a second path, andwherein the first path has a time constant longer than a time constant of the second path.3. The method of claim 1 ,wherein the first path has a gain smaller than a gain of the second path.4. The method of claim 1 ,wherein the steps of adjusting the first stimulus, the target stimulus and the second stimulus are sequentially iterated.5. The method ...

LASER APPARATUS, METHOD FOR GENERATING LASER BEAM, AND EXTREME ULTRAVIOLET LIGHT GENERATION SYSTEM

A laser apparatus for generating extreme ultraviolet (EUV) light at a wavelength of approximately 13 nm is provided. The laser apparatus may be combined with a reduced projection reflective optical system. Systems and methods for generating EUV light are also provided. 1. A laser apparatus , comprising:a plurality of master oscillators each configured to output a pulse laser beam at a different wavelength;at least one amplifier for amplifying the pulse laser beams;an optical shutter provided in a beam path of at least one of the pulse laser beams, the optical shutter being configured to adjust a transmittance of a pulse laser beam passing therethrough in accordance with a voltage applied thereto;a power source for applying the voltage to the optical shutter;a beam path adjusting unit provided in a beam path between the optical shutter and the amplifier for making beam paths of the pulse laser beams coincide with one another; anda controller configured to control the voltage to be applied to the optical shutter by the power source on a pulse-to-pulse basis for the pulse laser beam.2. The laser apparatus according to claim 1 , wherein the controller is configured to control the voltage applied to the optical shutter such that energy of the pulse laser beam transmitted through the optical shutter is at a predetermined energy level.3. The laser apparatus according to claim 1 , wherein each of the master oscillators is at least one of a semiconductor laser and a solid-state laser.4. The laser apparatus according to claim 3 , wherein a plurality of optical shutters are provided in beam paths of the respective pulse laser beams from the master oscillators.5. The laser apparatus according to claim 4 , wherein the at least one amplifier includes a carbon dioxide gas as a gain medium.6. The laser apparatus according to claim 5 , wherein the at least one amplifier includes a regenerative amplifier.7. The laser apparatus according to claim 4 , whereinthe controller is ...

COHERENT OPTICAL AMPLIFIER

A laser system including a seed laser and an optical amplification subsystem, receiving an output of the seed laser and providing an amplified laser output, the optical amplification subsystem including a first plurality of amplifier assemblies, each of the first plurality of amplifier assemblies including a second plurality of optical amplifiers, and phase control circuitry including phase modulating functionality associated with each of the first plurality of amplifier assemblies. 1. A laser system comprising:a seed laser; andan optical amplification subsystem, receiving an output of said seed laser and providing an amplified laser output, said optical amplification subsystem comprising:a first plurality of amplifier assemblies, each of said first plurality of amplifier assemblies including a second plurality of optical amplifiers; andfirst phase control circuitry including phase modulating functionality associated with each of said first plurality of amplifier assemblies.2. A laser system according to and wherein each of said first plurality of amplifier assemblies also comprises second phase control circuitry including phase modulating functionality associated with each of said second plurality of optical amplifiers claim 1 , said second phase control circuitry including a total output intensity sensor which measures the total output intensity of said second plurality of optical amplifiers and phase control logic circuitry which receives an output from said total output intensity sensor and varies the phase relationships of individual ones of said second plurality of optical amplifiers in order to maximize the total output intensity of said second plurality of optical amplifiers as sensed by said total output intensity sensor.3. A laser system according to and wherein said first phase control circuitry operates independently of said second phase control circuitry.4. A laser system according to and wherein said second phase control circuitry of each one of said ...

ENCLOSURE FOR A LASER PACKAGE

An enclosure for a laser package the enclosure being configured to receive a laser component within the enclosure, and further configured to receive for a driver integrated circuit (IC) () on the exterior of the enclosure, wherein the enclosure comprises first external electrical contacts () electrically connected to respective first IC electrical contacts (), and second IC electrical contacts () electrically connected to respective first internal electrical contacts (), wherein the first and second IC electrical contacts () are configured for electrical connection to the driver IC (). Heat dissipation of the driver IC is improved for the IC being mounted outside of the enclosure. 1. An enclosure for a laser package , the enclosure being configured to receive a laser component within the enclosure , and further configured to receive for a driver integrated circuit (IC) on the exterior of the enclosure , wherein the enclosure comprises first external electrical contacts electrically connected to respective first IC electrical contacts , and second IC electrical contacts electrically connected to respective first internal electrical contacts , wherein the first and second IC electrical contacts are configured for electrical connection to the driver IC.2. An enclosure according to claim 1 , wherein the number of second IC electrical contacts is greater than the number of first IC electrical contacts claim 1 , and the number of first internal contacts is greater than the number of first external contacts.3. An enclosure according to claim 1 , wherein the enclosure comprises second external electrical contacts electrically connected to respective second internal electrical contacts.4. An enclosure according to claim 1 , wherein the first and second IC electrical contacts are provided in an external IC contact region of the enclosure that is adjacent to a face of the enclosure and set-back from the face.5. An enclosure according to claim 4 , wherein the IC contact region ...

Ultrashort Optical Pulse Compression

An apparatus includes a spatial light modulator configured to receive an optical pulse train; and output a modulated optical pulse train; a non-linear optical system that receives the modulated optical pulse train and generates a non-linear optical signal; and a power detector that detects a power of the generated non-linear optical signal. A control system outputs a signal to the spatial light modulator to cause it to modulate the optical pulse train by modulating the spectral phase of the optical pulse at wavelengths within a current wavelength range subset and maintain the spectral phase of the optical pulse constant at wavelengths outside the current wavelength range subset; and based on the detected power, extracts values of the spectral phase for the optical pulse at wavelengths within the current wavelength range subset, the values extracted being those that compress the optical pulses. 1. A method for compressing ultrashort optical pulses of a train , the optical pulses having a range of wavelengths , the method comprising:partitioning the wavelength range into a plurality of subsets of wavelength ranges;selecting one of the wavelength range subsets as the current wavelength range subset; maintaining the spectral phase of the optical pulse constant at wavelengths outside the current wavelength range subset; and', 'modulating the spectral phase of the optical pulse at wavelengths within the current wavelength range subset;, 'modulating the optical pulse train based on the current wavelength range subset bygenerating a non-linear optical signal from the modulated optical pulse train by directing the modulated optical pulse train through a non-linear optical system;measuring the power of the generated non-linear optical signal; andbased on the measured power, extracting values of the spectral phase for the optical pulse at wavelengths within the current wavelength range subset, the values extracted being those that compress the optical pulses.2. The method of ...

VALVE FOR THE SUBSTANTIALLY GAS-TIGHT INTERRUPTION OF A FLOW PATH

The invention relates to a mirror arrangement for guiding a laser beam in a laser system having at least one first end mirror and one second end mirror, wherein said end mirrors define a resonator having an optical resonator axis, wherein the laser beam is guided into the resonator as an input laser beam and is guided out of the resonator again after multiple reflection at the first and second end mirrors as an output laser beam. The sequence of reflections at the first and second end mirror thereby determines a direction of rotation between the first and second end mirror, defined as an axis of rotation relative to the resonator axis, whereby a first beam path is defined and the laser beam circulates in a direction of rotation between the first and second end mirrors in the resonator defined as an axis of rotation relative to the resonator axis. The resonator is designed such that the direction of rotation is reversed at a reversing point and the laser beam in the resonator passes through at least partially in a direction of rotation opposite to the first beam path, whereby a second beam path is defined. 1. A mirror arrangement for guiding a laser beam in a laser system , in particular a laser system for generating femtosecond pulses or picosecond pulses , having at leastone first end mirror, andone second end mirror with a concave surface, the first and the second end mirrors form a resonator having an optical resonator axis connecting the end mirrors,', 'the laser beam is guided as input laser beam into the resonator, and is guided out of the resonator again after multiple reflection at, respectively, the first and the second end mirrors as output laser beam, and', 'the sequence of the reflections at the first and the second end mirrors fixes a direction of rotation, defined as axis of rotation relative to the resonator axis, between the first and second end mirrors in the resonator, a first beam path being defined thereby,, 'in which'}whereinthe resonator is ...

INFRARED LASER

Laser devices are presented in which a graphene saturable absorber and an optical amplifier are disposed in a resonant optical cavity with an optical or electrical pump providing energy to the optical amplifier. 1. A linear cavity laser device , comprising:a first mirror with a first surface;a second mirror with a second surface at least partially facing the first surface of the first mirror, the first and second mirrors defining a resonant optical cavity in which electromagnetic energy is amplified by stimulated emission of coherent radiation that is partially transmitted through the second mirror;a solid-state optically pumped optical gain medium disposed at least partially between the first and second surfaces;an optical pump providing light to the solid-state optically pumped optical gain medium; anda graphene saturable absorber disposed at least partially between the solid-state optically pumped optical gain medium and the first surface.2. The linear cavity laser device of claim 1 , wherein the solid-state optically pumped optical gain medium is a rare earth doped fiber amplifier operable at wavelengths of about 1.4 μm or more and about 3.0 μm or less.3. The linear cavity laser device of claim 1 , wherein the solid-state optically pumped optical gain medium is a solid state optically pumped infrared optical gain medium.4. The linear cavity laser device of claim 1 , wherein the solid-state optically pumped optical gain medium includes at least one II-VI family doped crystal.5. The linear cavity laser device of claim 1 , wherein the solid-state optically pumped optical gain medium includes at least one transition metal doped zinc chalcogenide.6. The linear cavity laser device of claim 1 , wherein the solid-state optically pumped optical gain medium includes at least one rare earth doped or transition metal doped laser ceramic.7. The linear cavity laser device of claim 1 , wherein the solid-state optically pumped optical gain medium includes at least one lead salt ...

Optical Amplifier System and Method

The invention provides a system for use in an optical communication network to reduce noise comprising means for tapping a low noise signal from said network and a phase sensitive amplifier (PSA) for conditioning said tapped signal by means for removing modulation of the tapped signal to allow for phase locking of the tapped signal. A laser source provides phase locked reference signals to generate at least one pump signal, wherein the at least one pump signal provides correct phase alignment for optimum PSA operation. The invention makes use of injection locked and/or phase locked laser sources in conjunction with low power input tap couplers, or post/mid amplification taps to provide the required phase locked reference signals without degrading the input loss or noise. The use of injection/phase locked local lasers suppresses the detrimental impact of the low tapped power or added noise in the generation of the required pump signals. 1. A phase shift amplifier system for use in an optical communication network having one or more signals , said system comprising:means for tapping a signal from said network;a phase sensitive amplifier (PSA) adapted for conditioning said tapped signal, characterised by:a signal conditioning sub-system adapted to condition the tapped signal by means for removing modulation of the tapped signal to allow for phase locking of the tapped signal; anda laser source for providing phase locked reference signals from said tapped signal, said laser adapted to generate at least one pump signal, wherein the at least one pump signal provides correct phase alignment for amplifier operation with the input signal or signals.2. The system as claimed in wherein the means for removing modulation of the tapped signal comprises a four wave mixer adapted to provide the at least one pump signal and a Continuous Wave (CW) signal.3. The system as claimed in wherein the laser source comprises an injection locked laser.4. The system as claimed in wherein the ...

BROADBAND LASER SOURCE FOR LASER THERMAL PROCESSING AND PHOTONICALLY ACTIVATED PROCESSES

A laser that emits light at all available frequencies distributed throughout the spectral bandwidth or emission bandwidth of the laser in a single pulse or pulse train is disclosed. The laser is pumped or seeded with photons having frequencies distributed throughout the superunitary gain bandwidth of the gain medium. The source of photons is a frequency modulated photon source, and the frequency modulation is controlled to occur in one or more cycles timed to occur within a time scale for pulsing the laser. 1. A laser that emits amplified light at all possible frequencies distributed throughout the spectral bandwidth of the laser in a single pulse or pulse train.2. The laser of claim 1 , wherein the laser emits all available resonant frequencies of the spectral bandwidth in a single pulse.3. The laser of claim 1 , comprising a source of photons having frequencies evenly distributed throughout the superunitary gain bandwidth of the laser.4. The laser of claim 3 , wherein the source of photons is frequency modulated.5. The laser of claim 3 , wherein the source of photons is pulsed claim 3 , and each pulse is frequency modulated.6. The laser of claim 3 , wherein the source of photons is a light-emitting diode.7. The laser of claim 4 , wherein the source of photons is a frequency tunable laser.8. The laser of claim 7 , wherein the frequency tunable laser is a fiber laser.9. The laser of claim 8 , wherein the fiber laser is chirped.10. The laser of claim 7 , wherein the frequency tunable laser is a diode laser.11. An optical emitter claim 7 , comprising:a source of frequency modulated photons operable to produce pulses of electromagnetic radiation having a range of frequencies; andan amplifier optically coupled to the source of frequency modulated photons, the amplifier comprising a gain medium having a range of gain frequencies that matches the range of frequencies of the frequency modulated photons.12. The optical emitter of claim 11 , wherein the source of frequency ...

Laser oscillation apparatus

Provided is a laser oscillation apparatus capable of stabilizing resonance even when finesse of an optical resonator is increased and generating stronger laser light than that of a traditional apparatus by accumulating laser light in the optical resonator. The laser oscillation apparatus includes a laser light source which generates laser light for excitation, a fiber amplifier which generates laser light with a desired wavelength when the laser light generated at the laser light source for excitation is supplied, an optical resonator, an optical isolator which is interposed between the optical resonator and the fiber amplifier and which guides the laser light from the fiber amplifier to one side of the optical resonator while blocking laser light in the opposite direction, a circulation optical path which accelerates resonance as introducing laser light emitted from the other side of the optical resonator and returning the laser light to the optical resonator via the fiber amplifier and the optical isolator, and a modulator which performs amplitude modulation on the laser light in the circulation optical path.

Coherent Micro-mixer

A coherent micro-mixer provides a 6-port device having two input ports four output ports. A signal light wave is input into one input port and a reference light wave is input into another input port. The four outputs from the output ports combine to produce interference between the two input light beams, with various relative phase shifts. 1. A coherent micro-mixer , comprising:a first input port for receiving a first beam of light (S beam) into said micro-mixer;a second input port for receiving a second beam of light (L beam) into said micro-mixer;a first interface, a second interface, a third interface, a fourth interface and a fifth interface,wherein said S beam can partially transmit through said first interface and said second interface and then exit said micro-mixer at a first output port,wherein said S beam can partially reflect at said second interface and then be reflected at said first interface to then exit said micro-mixer at a second output port,wherein said S beam can partially reflect from said first interface and then be reflected by said fifth interface and then partially transmit through said second interface and then exit said micro-mixer at a third output port,wherein said S beam can be partially reflected from said first interface, and then be partially reflected by said second interface and then exit said micro-mixer at said fourth output port,wherein said L beam can partially reflect from said third interface and then partially reflect from said second interface and the exit said micro-mixer at said first output port, wherein said S beam and said L beam are combined to produce a combined beam I1,wherein said L beam can be reflected at said first interface and then exit said micro-mixer at said second output port, wherein said S beam and said L beam are combined to produce a combined beam I2,wherein said L beam can be reflected at said fourth interface and then be partially reflected at said second interface and then exit said micro-mixer at ...

TUNABLE MODE LOCKED LASER

A laser for emitting simultaneously a first and second laser lights having respectively first and second wavelength differing from each other. The laser comprises: an optical resonator defining a first optical path and a second optical path, the first laser light travelling along the first optical path and the second laser light travelling along the second optical path; a modulated gain element inserted in the optical resonator for amplifying the first and second laser lights as the first and second laser lights propagate in the optical resonator respectively along the first and second optical paths, the modulated gain element having a variable gain modulated with a modulation period, round trip times of the first and second laser lights along respectively the first and second optical paths being respective integer multiples of the modulation period; and an output port for releasing the first and sec and laser lights from the optical resonator. 1. A laser cavity for emitting simultaneously a first laser light having a first wavelength and a second laser light having a second wavelength using pump light emitted by a pump light source , said first and second wavelengths differing from each other , said laser cavity comprising:an optical resonator, said optical resonator defining a first optical path and a second optical path, said first laser light travelling along said first optical path and said second laser light travelling along said second optical path;a gain medium inserted in said optical resonator, said gain medium being responsive to said pump light for converting said pump light to said first and second laser lights;a pump light input port optically coupled to said gain medium for receiving said pump light and conveying said pump light to said gain medium;an optical intensity modulator inserted in said optical resonator for absorbing simultaneously a portion of both said first and second laser lights as said first and second laser lights propagate in said ...

FIBER AMPLIFIER SYSTEM INCLUDING TAPERED FIBER BUNDLE AND POLARIZATION CONTROL

A fiber laser amplifier system including a beam splitter that splits a feedback beam into a plurality of fiber beams where a separate fiber beam is sent to a fiber amplifier for amplifying the fiber beam. A tapered fiber bundle couples all of the output ends of all of the fiber amplifiers into a combined fiber providing a combined output beam. A beam sampler samples a portion of the output beam from the tapered fiber bundle and provides a sample beam. A single mode fiber receives the sample beam from the beam sampler and provides the feedback beam. 1. A fiber amplifier system comprising:a splitter splitting a feedback beam into a plurality of fiber beams;a plurality of polarization controllers each receiving one of the fiber beams, said polarization controllers providing polarization orientation control;a plurality of fiber amplifiers each receiving and amplifying a fiber beam, said fiber amplifiers each including an output end;a tapered fiber bundle including an input end and an output end, said input end being coupled to the output end of all of the fiber amplifiers, said output end of the tapered fiber bundle being a combined fiber including a portion of all of the fiber amplifiers in a single fiber mass, said tapered fiber bundle outputting a combined output beam;a beam sampler for sampling a portion of the output beam from the tapered fiber bundle and providing a sample beam;a polarization detector detecting the polarization in the fiber beams in the sample beam and providing polarization measurement error signals;a synchronous polarization processor receiving the polarization measurement error signals and controlling the polarization controllers to control the orientation of the polarization of the fiber beams in the fiber amplifiers in response to the polarization measurement error signals; anda single mode fiber receiving the sample beam from the beam sampler, said single mode fiber providing the feedback beam.2. The system according to wherein the fiber ...

DIFFERENTIATION OF POWER AND CHANNEL COUNT CHANGES IN OPTICALLY AMPLIFIED LINKS

Exemplary embodiments of the invention are drawn to a method and apparatus for the differentiation of power and channel count changes in optically amplified links. Additionally, configuration of a corresponding optical amplifier can be based on the determination of the power and channel count changes. 1. A method comprising:measuring a first parameter from a first signal received at a node;measuring a second parameter from a second signal received at the node;comparing the first parameter to a third parameter and the second parameter to a fourth parameter; andidentifying a type of system perturbation based on the comparisons.2. The method of claim 1 , wherein the first parameter is a power measurement for the first signal claim 1 , wherein the fourth parameter is a baseline power measurement (Pb) of the first signal claim 1 , wherein the second parameter is a power measurement for the second signal claim 1 , and wherein the fourth parameter is a baseline power measurement (Pb) of the second signal.3. The method of claim 2 , wherein the first signal is an optical signal comprising a plurality of wavelengths and wherein the second signal is an optical service channel.4. The method of claim 2 , wherein a wavelength count change is identified if the comparison of the first signal power level to Pbindicates a change in the first signal power level and the comparison of the second signal power level to Pbindicates substantially no change in the second signal power level.5. The method of claim 2 , wherein a wavelength count change is identified if the comparison of the first signal power level to Pbindicates a change in the first signal power level and the comparison of the second signal power level to Pbindicates an opposite change in the second signal power level.6. The method of claim 1 , further comprising:establishing a new output power for an optical amplifier in the node, based on the first parameter, in response to a channel count change being identified as the ...

Fiber amplifier system including tapered fiber bundle and combined lens and sampling grating

A fiber laser amplifier system including a beam splitter that splits a feedback beam into a plurality of fiber beams where a separate fiber beam is sent to a fiber amplifier for amplifying the fiber beam. A tapered fiber bundle couples the output ends of all of the fiber amplifiers into a combined fiber providing a combined output beam. A beam sampler samples a portion of the output beam from the tapered fiber bundle and provides a sample beam. A single mode fiber receives the sample beam from the beam sampler and provides the feedback beam.

EXTREME ULTRAVIOLET LIGHT SOURCE DEVICE, LASER LIGHT SOURCE DEVICE FOR EXTREME ULTRAVIOLET LIGHT SOURCE DEVICE, AND METHOD OF ADJUSTING LASER LIGHT SOURCE DEVICE FOR EXTREME ULTRAVIOLET LIGHT SOURCE DEVICE

An EUV light source device properly compensates the wave front of laser beam which is changed by heat. A wave front compensator and a sensor are provided in an amplification system which amplifies laser beam. The sensor detects and outputs changes in the angle (direction) of laser beam and the curvature of the wave front thereof. A wave front compensation controller outputs a signal to the wave front compensator based on the measurement results from the sensor. The wave front compensator corrects the wave front of the laser beam to a predetermined wave front according to an instruction from the wave front compensation controller. 113.-. (canceled)14. A laser light source device for use in an extreme ultraviolet light source device , comprising:a laser oscillator that outputs laser beam;an amplification system that amplifies the laser beam output from the laser oscillator by at least one amplifier; anda focusing system that inputs the laser beam, amplified by the amplification system, into a chamber of the extreme ultraviolet light source device, at least one first compensation unit that compensates a direction of laser beam and a shape of a wave front thereof in the amplification system to a predetermined direction and a predetermined wave front shape, and', 'at least one compensation control unit that controls a compensation operation by the first compensation unit., 'at least the amplification system being provided with'}1521.-. (canceled)22. A laser light source device comprising:a laser oscillator that outputs laser beam;an amplification system that amplifies the laser beam output from the laser oscillator by at least one amplifier; anda focusing system that inputs the laser beam, amplified by the amplification system, into a chamber of the extreme ultraviolet light source device, at least one first compensation unit that compensates a direction of laser beam and a shape of a wave front thereof in the amplification system to a predetermined direction and a ...

PULSED LIGHT SOURCE

Pulsed light source comprising pulse generation means (), such as an optical oscillator, whose output is divided into three arms: two arms () to generate a CEP-stable, ultrabroadband idler output; and a third arm () to generate a narrowband pump output. The pump output and idler output seed an OPCPA (), generating stable ultrashort pulses. 111-. (canceled)131. The pulsed light source according to claim 12 , wherein the pulse generation means () is a Master Oscillator Power Amplifier System.14. The pulsed light source according to claim 12 , wherein the first idler arm and the second idler arm further comprise a second harmonic generation stage.155101. The pulsed light source according to claim 12 , wherein the pump arm () further comprises second wavelength shifting means () configured to shift the wavelength of the pulsed signal from the pulse generation means () to a third wavelength.16512. The pulsed light source according to claim 12 , wherein the pump arm () further comprises an amplifier () adapted to amplify the pump output.1778. The pulsed light source according to claim 12 , further comprising coupling means () adapted to couple the first auxiliary signal and the second auxiliary signal before the signal mixing means ().1814. The pulsed light source according to claim 12 , wherein the pulse compressor () further comprises programmable dispersion compensation means.1914. The pulsed light source according to claim 12 , wherein the pulse compressor () further comprises a fixed phase-plate adapted to compensate dispersion.2014. The pulsed light source according to claim 12 , wherein the pulse compressor () further comprises chirped dielectric mirrors adapted to compensate dispersion.218. The pulsed light source according to claim 12 , wherein the signal mixing means () is a Difference-Frequency Generation Crystal.22. The pulsed light source according to claim 21 , wherein the first auxiliary signal and the second auxiliary signal comprise broadband ultrashort ...

OPTICAL DISC APPARATUS AND OPTICAL POWER CONTROL METHOD

An optical disc apparatus includes: a light source; a power detection portion that detects optical power of light emitted from the light source; a temperature detection portion that detects an ambient temperature of the power detection portion; a storage portion in which information relating to a temperature drift characteristic of the power detection portion is stored; and a control portion that controls the optical power while performing a temperature correction relating to the power detection portion by using the information stored in the storage portion. In the optical disc apparatus, the information stored in the storage portion is updated. 1. An optical power control method in which a power detection portion that detects optical power of light emitted from a light source is used to control the optical power , the method comprising:a first step of acquiring a temperature drift characteristic of the power detection portion by acquiring an output value of the power detection portion at each of two or more timings at which an ambient temperature of the power detection portion has different values from each other;a second step of, based on the temperature drift characteristic, determining whether or not a gain of the power detection portion should be changed;a third step of, if the gain is determined not to be changed, determining to perform a temperature correction relating to the power detection portion based on the temperature drift characteristic previously acquired and, if the gain is determined to be changed, determining to newly acquire a temperature drift characteristic and perform the temperature correction relating to the power detection portion based on the newly acquired temperature drift characteristic; anda fourth step of performing the control of the optical power while performing the temperature correction based on the temperature drift characteristic determined to be used for the temperature correction and on a measured ambient temperature of the ...

EXTERNAL CAVITY TUNABLE LASER MODULE

Disclosed is an external cavity tunable laser module including a substrate; a mirror surface that is formed on the substrate to reflect a laser incoming from the outside; a transmissive liquid crystal filter that is formed at a rear side of the mirror surface to select and tune a wavelength of the laser reflected through the mirror surface; and a light source chip that is formed at a rear side of the transmissive liquid crystal filter to reflect the laser that passes through the transmissive liquid crystal filter at a specific wavelength interval to form a plurality of channels and tune wavelengths of the channels. 1. An external cavity tunable laser module , comprising:a substrate;a mirror surface that is formed on the substrate to reflect a laser incoming from the outside;a transmissive liquid crystal filter that is formed at a rear side of the mirror surface to select and tune a wavelength of the laser reflected through the mirror surface; anda light source chip that is formed at a rear side of the transmissive liquid crystal filter to reflect the laser that passes through the transmissive liquid crystal filter at a specific wavelength interval to form a plurality of channels and tune wavelengths of the channels.2. The external cavity tunable laser module of claim 1 , wherein the transmissive liquid crystal filter includes:two glass plates;a liquid crystal material filled between the two glass plates; andan electrode that applies a voltage to the two glass plates.3. The external cavity tunable laser module of claim 1 , wherein the transmissive liquid crystal filter is mounted so as to be inclined at about 1 to 10 degrees with respect to an optical axis.4. The external cavity tunable laser module of claim 1 , further comprising:a temperature control unit that is formed below the light source chip to stabilize the output of the laser.5. The external cavity tunable laser module of claim 1 , wherein an input terminal and an output terminal of the light source chip ...

LASER DEVICE

A laser device including a plurality of oscillating means for oscillating a plurality of laser lights being continuous lights and having frequencies different from each other, respectively, multiplexing means for multiplexing, after amplifying or without amplifying, the respective laser lights oscillated from the respective oscillating means at a predetermined position to generate a multiplexed light, and phase control means for controlling the phase of each of the laser lights so that a peak in output of the multiplexed light repeatedly appears at predetermined time intervals at the predetermined position (so that the same pulse temporal waveform repeatedly appears at predetermined time intervals). 1. A laser device comprising:a plurality of oscillating means for oscillating a plurality of laser lights being continuous lights and having frequencies different from each other, respectively;multiplexing means for multiplexing the respective laser lights oscillated from the respective oscillating means at a predetermined position to generate a multiplexed light; andphase control means for controlling the phase of each of the laser lights so that a peak in output of the multiplexed light repeatedly appears at predetermined time intervals at the predetermined position.2. The laser device according to claim 1 , wherein the respective oscillating means oscillate the laser lights having frequencies different from each other with substantially constant frequency differences claim 1 , respectively.3. The laser device according to claim 1 , wherein the oscillating means is a semiconductor laser.4. The laser device according to claim 1 , wherein each of the oscillating means is connected with an optical fiber through which each of the laser lights propagates claim 1 , andthe phase control means controls the phase of each of the laser lights by controlling the temperature of each of the optical fibers.5. A laser device comprising:oscillating means for oscillating a laser pulse ...

LASER LIGHT SOURCE

A laser light source according to the present invention includes a laser element that outputs a fundamental wave; a wavelength conversion element into which the fundamental wave is input and that converts at least a part of the fundamental wave input therein to a converted wave having a wavelength shorter than the wavelength of the fundamental wave; a waveguide that attenuates a component of the fundamental wave included in an output wave from the wavelength conversion element; and a diffraction grating that is formed on the waveguide and feeds back the fundamental wave output from the wavelength conversion element to lock the wavelength or the frequency of the fundamental wave output from the laser element. The diffraction grating is formed at a position determined taking into account an amount by which the fundamental wave is attenuated in the waveguide. 1. A laser light source comprising:a laser element that outputs a fundamental wave;a wavelength conversion element into which the fundamental wave is input and that converts at least a part of the fundamental wave input therein to a converted wave having a wavelength shorter than the wavelength of the fundamental wave;a waveguide that attenuates a component of the fundamental wave included in an output wave from the wavelength conversion element; anda diffraction grating that is formed on the waveguide and feeds back the fundamental wave output from the wavelength conversion element to lock the wavelength or the frequency of the fundamental wave output from the laser element, whereinthe diffraction grating is formed at a position determined taking into account an amount by which the fundamental wave is attenuated in the waveguide.2. The laser light source according to claim 1 , wherein the waveguide is an optical fiber.3. The laser light source according to claim 2 , wherein a portion of the optical fiber where the diffraction grating is formed is fixed so as to not move.4. The laser light source according to ...

LASER PROCESSING APPARATUS AND LASER PROCESSING METHOD

A laser processing apparatus () irradiates a processed object () with YAG-based laser light focused by a first irradiation unit () and radiates COlaser light having a longer wavelength than the YAG-based laser light and focused by the second irradiation unit () onto a region of the processed object () being irradiated with the YAG-based laser light. In other words, the YAG-based laser light melts the metal forming the processed object (), and the COlaser light, having a higher plasma absorptance than the YAG-based laser light, increases the temperature of the molten metal. As a result, the molten metal reaches a high temperature, and the viscosity of the molten metal can be sufficiently reduced for the molten metal to be blown away by assist gas. 1. A laser processing apparatus comprising:a first irradiating unit for focusing a first laser beam and irradiating a processed object; anda second irradiating unit for focusing a second laser beam having a longer wavelength than the first laser beam and irradiating the processed object,wherein a region of the processed object being irradiated with the first laser beam focused by the first irradiating unit is irradiated with the second laser beam focused by the second irradiating unit.2. A laser processing apparatus comprising:a first emitting unit for emitting a first laser beam for processing a processed object;a second emitting unit for emitting a second laser beam for processing the processed object and having a longer wavelength than the first laser beam; anda focusing unit for focusing the first laser beam and the second laser beam so that the second laser beam emitted from the second emitting unit irradiates a region of the processed object being processed by the first laser beam emitted from the first emitting unit.3. The laser processing apparatus according to claim 2 , whereinthe focusing unit is a focusing lens that focuses the first laser beam and the second laser beam onto the processed object, andthe first ...

Small packaged tunable laser assembly

A tunable laser configured in a small package coupled to a printed circuit board. The tunable laser includes a housing with a volume formed by exterior walls. An electrical input interface is positioned at the first end of the housing. An optical output interface is positioned at the second end of the housing and configured to transmit a continuous wave optical beam. A beam splitter and photodiode is disposed in the path of the laser beam for determining the emitted intensity of the laser beam, and an optical isolator is positioned downstream of the beam splitter to prevent the incoming light from the beam splitter from reflecting back though the beam splitter and into the cavity of the laser.

OPTICAL PARAMETRIC AMPLIFICATION, OPTICAL PARAMETRIC GENERATION, AND OPTICAL PUMPING IN OPTICAL FIBERS SYSTEMS

Embodiments described herein include a system for producing ultrashort tunable pulses based on ultra broadband OPA or OPG in nonlinear materials. The system parameters such as the nonlinear material, pump wavelengths, quasi-phase matching periods, and temperatures can be selected to utilize the intrinsic dispersion relations for such material to produce bandwidth limited or nearly bandwidth limited pulse compression. Compact high average power sources of short optical pulses tunable in the wavelength range of 1800 to 2100 nm and after frequency doubling in the wavelength range of 900 to 1050 nm can be used as a pump for the ultra broadband OPA or OPG. In certain embodiments, these short pump pulses are obtained from an Er fiber oscillator at about 1550 nm, amplified in Er fiber, Raman-shifted to 1800 to 2100 nm, stretched in a fiber stretcher, and amplified in Tm-doped fiber. 1. An optical pulse source comprising:a fiber based laser system comprising a seed laser configured to emit optical seed pulses;a pulse stretcher configured to stretch said seed pulses;a Tm fiber amplifier configured to amplify said stretched optical pulses, said Tm fiber amplifier comprising at least one doped fiber containing Tm;a pulse compressor disposed downstream from said at least one Tm fiber amplifier and arranged to compress pulses produced by said Tm fiber amplifier; andan output port configured to output optical pulses compressed with said pulse compressor.2. The optical pulse source according to claim 1 , wherein said seed laser comprises an Er laser.3. The optical pulse source according to claim 1 , wherein said seed laser comprises a mode-locked Er fiber oscillator.4. The optical pulse source according to claim 3 , wherein said fiber based laser system comprises a Raman shifter configured to generate Raman scattering within said fiber based laser system to shift a wavelength of a pulse generated with said mode-locked Er fiber oscillator to a longer wavelength in a range extending ...

PRODUCES VARIOUS TYPES OF PULSES BY CONTROLLING THE DISTANCE BETWEEN THE SATURABLE ABSORBER CONNECTORS

Provided is a device of generating various types of pulses by controlling a distance between saturable absorber connectors, and more particularly, a device of generating various types of pulses by controlling a distance between saturable absorber connectors, capable of actively controlling a distance between saturable absorbers to completely overcome a disadvantage that an opened space is present in a cavity or a disadvantage that a fiber component should be changed and implementing a simple design of the entire fiber laser cavity since only a saturable absorber part, which is a portion of a fiber laser cavity, should be designed, as a carbon nanotube saturable absorber part in a passively mode-locked fiber laser generating apparatus using the saturable absorber. 1. A device of generating various types of pulses by controlling a distance between saturable absorber connectors , the device comprising:{'b': 500', '100', '110', '120', '200', '100', '300', '200', '200, 'a saturable absorber moving unit including a saturable absorber mounting part having one portion to which a saturable absorber is coupled and the other portion to which a fiber is coupled, a fiber fixing part having one portion to which the saturable absorber mounting part is coupled, and a micro driving part coupled to the other portion of the fiber fixing part to horizontally move the fiber fixing part ;'}{'b': 600', '100', '110', '120', '200', '100', '500, 'a saturable absorber fixing unit including a saturable absorber mounting part having one portion to which a saturable absorber is coupled and the other portion to which a fiber is coupled and a fiber fixing part having one portion to which the saturable absorber mounting part is coupled, and fixed to be spaced apart from the saturable absorber moving unit by a predetermined distance; and'}{'b': 700', '500', '600, 'a fiber connecting unit provided between the saturable absorber moving unit and the saturable absorber fixing unit to be fixed.'} ...

OPTICAL ASSEMBLY AND METHOD FOR GENERATING LIGHT PULSES OF VARIABLE DELAY

The invention relates to an optical assembly () comprising a pulsed light source () for generating primary light pulses (), a pulse splitter () for splitting said primary light pulses () into first and second secondary light pulses (), and a delay element () for delaying said second secondary light pulses () relative to said first secondary light pulses (), where the pulse repetition rate of said pulsed light source () is variable in order to change a temporal delay between different secondary light pulses () The invention is characterized in that said optical assembly () comprises a thermal insulation (), a temperature stabilizer () or a temperature compensator () for said delay element () and/or a control circuit () for determining and controlling a drift of said pulse repetition rate. 1124546787621. Optical assembly () comprising a pulsed light source () for generating primary light pulses () , a pulse splitter () for splitting said primary light pulses () into first and second secondary light pulses ( , ) , and a delay element () for delaying said second secondary light pulses () relative to said first secondary light pulses () , where the pulse repetition rate of said pulsed light source () is variable , characterized in that said optical assembly () comprises{'b': 12', '8, 'a temperature insulation () for thermally insulating said delay element (), and/or'}{'b': 16', '8, 'a temperature stabilizer () for thermally stabilizing said delay element (), and/or'}{'b': 13', '8, 'a temperature compensator () for compensating a temperature-dependent change of an optical path length of said delay element () and/or'}{'b': 27', '2, 'a control circuit () for controlling said pulse repetition rate of said pulsed light source, preferably for detecting and controlling a drift of a mean pulse repetition rate of said pulsed light source ().'}212852. Optical assembly according to characterized in that said temperature insulation () in addition to said delay element () also ...

PHASE-CONTINUOUS TUNABLE LASER

A tunable laser comprises a first tuner configured to select an emission wavelength of the laser a second tuner configured to adjust a cavity mode of the laser by modifying the cavity optical path length. The second tuner is constrained by a finite tuning range. The tunable laser also comprises a controller configured to control the first and second tuners to select the emission wavelength and adjust the cavity mode in synchronization to perform phase-continuous tuning across a range larger than supported by the finite tuning range of the second tuner. 1. A tunable laser , comprising:a first tuner configured to select an emission wavelength of the laser;a second tuner configured to adjust a cavity mode of the laser by modifying the cavity optical path length, wherein the second tuner is constrained by a finite tuning range; anda controller configured to control the first and second tuners to select the emission wavelength and adjust the cavity mode in synchronization to perform phase-continuous tuning across a range larger than supported by the finite tuning range of the second tuner.2. The tunable laser of claim 1 , wherein the first tuner comprises a mechanically tuned filter comprising at least one of a diffraction grating claim 1 , a mirror claim 1 , and a prism.3. The tunable laser of claim 2 , further comprising a direct drive motor configured to rotate the diffraction gating claim 2 , mirror claim 2 , or prism about its own center.4. The tunable laser of claim 1 , wherein the second tuner comprises a polarization controller that linearly advances a phase of an input wavelength from 0 to 2π in successive drive periods of sinusoidal drive voltages.5. The tunable laser of claim 4 , wherein the polarization controller comprises waveplates and at least one of the waveplates is rotated about an axis to linearly advance the phase of the input wavelength from 0 to 2π in successive drive periods of the sinusoidal drive voltages.6. The tunable laser of claim 5 , ...

WAVELENGTH CONVERTER, WAVELENGTH CONVERTING DEVICE, SOLID STATE LASER DEVICE, AND LASER SYSTEM

A wavelength converter may include a non-linear optical crystal, and an optical member bonded to a region of a contact surface of the non-linear optical crystal, located a predetermined distance or more on an inner side from an outer periphery of the contact surface. The wavelength converter may receive laser light and stably output light having a wavelength different from that of the laser light. 1. A wavelength converter comprising:a first non-linear optical crystal having a first contact surface; anda first optical member bonded to a region of the first contact surface, located a predetermined distance or more on an inner side from an outer periphery of the first contact surface,wherein the wavelength converter receives laser light and outputs light having a wavelength different from that of the laser light.2. The wavelength converter as claimed in claim 1 , wherein the first non-linear optical crystal is a KBBF crystal.3. The wavelength converter as claimed in claim 1 , wherein the first non-linear optical crystal and the first optical member are bonded by optical contact.4. The wavelength converter as claimed in claim 1 , wherein the first optical member includes a prism.5. The wavelength converter as claimed in claim 1 , wherein the first non-linear optical crystal has a second contact surface located on an opposite side from the first contact surface claim 1 , and further comprising:a second optical member bonded to a region of the second contact surface, located a predetermined distance or more on an inner side from an outer periphery of the second contact surface.6. The wavelength converter as claimed in claim 5 , wherein the first non-linear optical crystal and the second optical member are bonded by optical contact.7. The wavelength converter as claimed in claim 5 , wherein each of the first and second optical members includes a prism.81. The wavelength converter as claimed in claim claim 5 , wherein the first non-linear optical crystal has a second ...

Method For Illuminating A Sample With Supercontinuum Pulses

A method of providing supercontinuum illumination in applications involving the excitation of fluorescence, comprising generating, at an optical pump laser, optical pump pulses at a pump pulse repetition rate; selectively controlling with an optical modulator the launch of pump pulses into a nonlinear optical element comprising an optical fiber at a variable, lower repetition rate to thereby selectively control the repetition rate of supercontinuum pulses generated within the optical fiber; and illuminating a sample with supercontinuum pulses to excite fluorescence. The supercontinuum pulses can be wavelength filtered such that the fluorescence is excited with wave length filtered supercontinuum pulses. 1. A method of providing supercontinuum illumination in applications involving the excitation of fluorescence , comprising:generating, at an optical pump laser, optical pump pulses at a pump pulse repetition rate;selectively controlling with an optical modulator the launch of pump pulses into a nonlinear optical element comprising an optical fiber at a variable, lower repetition rate to thereby selectively control the repetition rate of supercontinuum pulses generated within the optical fiber; andilluminating a sample with supercontinuum pulses to excite fluorescence.2. The method of claim of providing supercontinuum illumination of further comprising measuring a decay lifetime of the excited fluorescence.3. The method of providing supercontinuum illumination of comprising claim 1 ,receiving supercontinuum pulses with a wavelength tunable optical bandpass filter and wavelength filtering the pulse at a selected wavelength to provide wavelength filtered supercontinuum pulses; andwherein illuminating the sample with supercontinuum pulses comprises illuminating the sample with the wavelength filtered supercontinuum pulses.4. The method of providing supercontinuum illumination of comprising claim 2 ,receiving supercontinuum pulses with a wavelength tunable optical ...

Variable Repetition Rate And Wavelength Optical Pulse Source

Variable repetition rate and wavelength optical pulse source, comprising a fixed or variable repetition rate source of supercontinuum pulses; a wavelength tunable optical bandpass filter to filter the supercontinuum pulses at two or more wavelengths, wherein said source of supercontinuum pulses and said wavelength tunable optical bandpass filter are configured such that the optical pulse source can provide variable repetition rate and variable wavelength optical pulses including a series of repetition rates with selected wavelength-varying pulse trains. 1. Variable repetition rate and wavelength optical pulse source , comprising:a fixed or variable repetition rate source of supercontinuum pulses;a wavelength tunable optical bandpass filter to filter the supercontinuum pulses at two or more wavelengths,wherein said source of supercontinuum pulses and said wavelength tunable optical bandpass filter are configured such that the optical pulse source can provide variable repetition rate and variable wavelength optical pulses including a series of repetition rates with selected wavelength-varying pulse trains.2. The variable repetition rate and wavelength optical pulse source of wherein the wavelength tunable optical bandpass filter is configured to receive a plurality of supercontinuum pulses in a pulse set and to wavelength filter each pulse at a respective one of a corresponding plurality of predetermined wavelengths claim 1 , to thereby form a wavelength interleaved optical pulse set.3. The variable repetition rate and wavelength pulse source of wherein the wavelength tunable optical bandpass filter is configured to operate in burst mode to provide a pulse train comprising a burst of optical pulses.4. The variable repetition rate and wavelength optical pulse source of wherein the wavelength tunable optical bandpass filter comprises an acousto-optic tunable filter (AOTF).5. The variable repetition rate and wavelength optical pulse source of wherein said fixed or ...

Supercontinuum Pulse Source

An optical pulse source for generating optical supercontinuum pulses comprises an optical pump laser operable to generate optical pump pulses at a pump pulse repetition rate Rf; a nonlinear optical element comprising an optical fiber for generating optical supercontinuum pulses; an optical modulator operable to selectively control the launch of pump pulses into the optical fiber at a reduced, lower repetition rate Rr=Rf/N in order to generate optical supercontinuum pulses at a selectable and lower repetition rate; an optical fiber amplifier located between the optical modulator and the optical pump laser; wherein the optical supercontinuum pulses generated by the optical fiber have a supercontinuum spanning from below 450 nm to greater than 2000 nm; wherein the optical pulse source is provided with a microprocessor configured to determine when supercontinuum pulses are delivered; and wherein the optical pulse source is configured to provide an output trigger signal. 1. Optical pulse source for generating optical supercontinuum pulses , comprising:an optical pump laser operable to generate optical pump pulses at a pump pulse repetition rate Rf;a nonlinear optical element comprising an optical fiber arranged to receive the optical pump pulses and configured to generate therefrom optical supercontinuum pulses;an optical modulator provided between the pump laser and the optical fiber and operable to selectively control the launch of pump pulses into the optical fiber at a reduced, lower repetition rate Rr=Rf/N, wherein N is a positive integer, in order to generate optical supercontinuum pulses at a selectable repetition rate lower than the pump pulse repetition rate;an optical fiber amplifier located between the optical modulator and the optical pump laser;{'b': '450', 'wherein the optical pulse source is configured such that the optical supercontinuum pulses generated by the optical fiber have a supercontinuum spanning from below nm to greater than 2000 nm;'}wherein ...

AMPLIFICATION DEVICE WITH FREQUENCY DRIFT FOR A PULSED LASER

An amplification device with frequency drift for a pulsed laser includes a stretcher temporally stretching an incident laser pulse, at least one amplifying medium for amplifying the stretched laser pulse, and a compressor for temporally compressing the stretched and amplified laser pulse. The compressor includes an amplifying medium for amplifying a partially temporally compressed laser pulse, increasing energy yield of the amplifier. 1. An amplification device with frequency drift for a pulsed laser , successively comprising:a stretcher for temporally stretching an incident laser pulse;at least one amplifying medium for amplifying a laser pulse that has been stretched; anda compressor for temporally compressing the laser pulse that has been stretched and amplified, wherein the compressor comprises an amplifying medium for amplifying a partially temporally compressed laser pulse, to increase energy yield of the amplifier.2. The amplification device according to claim 1 , wherein the amplifying medium located in the compressor positioned where duration of the laser pulse is substantially half of the duration of a pulse penetrating the compressor.3. The amplification device according to claim 1 , whereinthe compressor comprises first, second, third, and fourth successive dispersive systems, andthe amplifying medium is placed between the second and third dispersive systems.4. The amplification device according to claim 3 , wherein the first claim 3 , second claim 3 , third claim 3 , and fourth dispersive systems are dispersion gratings.5. The amplification device according to claim 3 , wherein the first and second dispersive systems are located in open air claim 3 , and the third and fourth dispersive systems are located in a vacuum chamber.6. The amplification device according to claim 1 , wherein the stretcher includes at least one dispersion grating.7. The amplification device according to claim 1 , wherein the amplifying medium located in the compressor includes a ...

Laser architectures

Disclosed herein are architectures for VCSEL systems. By using high power IR VCSEL element(s), a bulk doubling material can be used to double the IR light and generate visible light (red, green, blue, or UV light) in a cavity, in either continuous wave (CW) or pulsed mode. The reflectivity of the output distributed Bragg reflector (DBR) of these VCSELs can be designed to increase the power in the cavity, rather than the power in the VCSEL laser. By enabling the use of a bulk doubling material in the cavity and directly doubling the VCSEL the device can be inexpensive, simpler, high efficiency, better reliability, and vastly improved manufacturing and alignment tolerances. There are a number of cavity architectures that can be used to double the IR light from the VCSEL(s). The VCSEL(s) can be single elements, or arrays with high intensity elements.

OPTICAL DEVICE, LASER APPARATUS, AND EXTREME ULTRAVIOLET LIGHT GENERATION SYSTEM

An optical device may include: an optical module disposed in a beam delivery path of a laser beam; a beam adjusting unit disposed in the beam delivery path for adjusting the beam delivery path of the laser beam; a measuring unit disposed in the beam delivery path for detecting the beam delivery path; and a control unit for controlling the beam adjusting unit based on a detection result of the beam delivery path of the laser beam detected by the measuring unit. 1. An optical device , comprising:an optical module disposed in a beam delivery path of a laser beam, a beam adjusting unit disposed in the beam delivery path for adjusting the beam delivery path of the laser beam;a measuring unit disposed in the beam delivery path for detecting the beam delivery path; anda control unit for controlling the beam adjusting unit based on a detection result of the beam delivery path of the laser beam detected by the measuring unit.2. The optical device according to claim 1 , wherein the optical module is one of an amplifier for amplifying the laser beam claim 1 , a relay optical system claim 1 , a saturable absorber cell claim 1 , an optical system for adjusting the length of the beam delivery path claim 1 , a spatial filter claim 1 , and an optical system including a polarization control element.3. The optical device according to claim 1 , wherein the beam adjusting unit is disposed at an input side of the optical module.4. The optical device according to claim 1 , wherein the beam adjusting unit is disposed at an output side of the optical module.5. The optical device according to claim 1 , further comprising: a guide laser apparatus for outputting a guide laser beam at a wavelength that differs from a wavelength of the laser beam; and a beam delivery path combining unit for substantially combining the beam delivery path of the guide laser beam with the beam delivery path of the laser beam.6. The optical device according to claim 5 , wherein the measuring unit detects the beam ...

Device for Amplifying a Laser Beam with Suppression of Transverse Lasing

A device for amplifying a laser beam along an axis comprises: an amplifying bar structure of index n, delimited by a surface connecting the input and output faces of the structure, having a dimension e along the axis and Φ along a perpendicular direction, with e<Φ, and intended to be pumped to become a gain medium with a maximum along a face, and a liquid of index nwhich surrounds the structure in relation to its surface and which is absorbent or scattering at the fluorescence wavelength of the amplifying bar structure. The surface comprises a first tooth in the form of a chamfer at its junction with the maximum gain face, to avoid causing parasitic transverse lasing and the liquid of index nhas a heat capacity of greater than 3000 Joules per kilogram per K° to dissipate the thermal power induced by the pumping. 2111. The device for amplifying a laser beam as claimed in claim 1 , wherein the surface Σ comprises a second tooth with two faces claim 1 , the face oriented toward the first tooth being inclined at an angle β with respect to the axis Ox claim 1 , α and β being such that the photons propagating parallel to the maximum gain face and reflected by the first tooth arrive perpendicularly at this face of the second tooth.32222222. The device for amplifying a laser beam as claimed in claim 2 , wherein the gain medium exhibits another maximum along the other face of the amplifying bar structure and in that the surface Σ exhibits a third tooth () in the form of another chamfer over all or part of its junction with this other maximum gain face and over a length e′ labeled along the axis Ox claim 2 , e′ being greater than the predetermined threshold length claim 2 , this other chamfer being oriented at an angle α with respect to Ox claim 2 , the second face of the second tooth being inclined at an angle β with respect to the axis Ox claim 2 , α and β being such that the photons propagating parallel to this other maximum gain face and reflected by the third tooth ...

Laser apparatus

A laser apparatus includes a master oscillator capable of outputting a laser beam having a spectrum that includes at least three wavelength peaks, a multi-wavelength oscillation control mechanism capable of controlling energy of each of the wavelength peaks, a spectrum detecting unit that detects the spectrum of the above-mentioned laser beam, and a controller that controls the multi-wavelength oscillation control mechanism based on a detection result detected by the spectrum detecting unit.

FREQUENCY-DRIFT AMPLIFICATION DEVICE FOR A PULSED LASER

A frequency-drift amplification device for a pulsed laser, including: a stretcher for time-stretching an incident laser pulse; at least one amplifying medium for amplifying the laser pulse; a main compressor for time-compressing the laser pulse to a desired duration for an output pulse of the amplification device; and at least one adjustment compressor between the stretcher and the main compressor, and in which the laser pulse undergoes four diffractions on diffraction gratings to time-compress the stretched laser pulse to a duration that is greater than the desired duration for the output pulse of the amplification device. 1. A chirped pulse amplification device for a pulsed laser , comprising:a stretcher for time-stretching an incident laser pulse;at least one amplifying medium for amplifying the laser pulse;a main compressor for time-compressing the laser pulse to a desired duration for an output pulse of the amplification device; andat least one adjustment compressor for adjusting the duration of the output pulse and correcting time aberrations, whereinthe adjustment compressor is placed between the stretcher and the main compressor, andthe laser pulse undergoes four diffractions on diffraction gratings to time-compress the stretched laser pulse to a duration longer than the desired duration for the output pulse of the amplification device.2. The amplification device according to claim 1 , wherein compression rate of the adjustment compressor is less than 20% of compression rate of the main compressor.3. The amplification device according to wherein the adjustment compressor is placed in a position where energy from the laser pulse is less than 300 millijoules.4. The amplification device according to claim 1 , wherein the adjustment compressor is placed after a first amplification medium in an amplification chain including at least two amplification mediums.5. The amplification device according to claim 1 , wherein the adjustment compressor comprises four ...

Master oscillator system and laser apparatus

A master oscillator system may include a grating configured to function as one resonator mirror in an optical resonator, a spectral bandwidth tuning unit configured to tune the spectral bandwidth of a laser beam transmitted within the optical resonator, a storage unit configured to store a control value of the spectral bandwidth tuning unit corresponding to a desired spectral bandwidth and a controller configured to control the spectral bandwidth tuning unit based on the control value stored in the storage unit.

LIGHT SOURCE DEVICE, ANALYSIS DEVICE, AND LIGHT GENERATION METHOD

In aspects of the invention, wavelength conversion element has a harmonic generation portion and a parametric oscillation portion. The harmonic generation portion generates a harmonic of laser light output from a laser light source. The parametric oscillation portion generates signal light and idler light from the harmonic generated by the harmonic generation portion. In some aspects of the invention, electrodes and a first voltage control portion control the intensity of the harmonic generated by the harmonic generation portion. A first FBG (Fiber Bragg Grating) and a second FBG cause resonance of signal light output from the parametric oscillation portion. A piezo tube and a second voltage control portion change the resonance frequency of the first FBG and the second FBG. 1. A light source device , comprising:a laser light source;a wavelength conversion element, having a harmonic generation portion which generates a harmonic of laser light output from the laser light source, and a parametric oscillation portion which generates signal light and idler light from the harmonic generated by the harmonic generation portion;an intensity control portion, which is provided separately from the laser light source, and controls an intensity of the harmonic generated by the harmonic generation portion;a resonator, which causes resonance of the signal light output from the parametric oscillation portion; anda resonance control portion, which changes a resonance frequency of the resonator,wherein the resonator includes a FBG (Fiber Bragg Grating) which connects an input side and an output side of the wavelength conversion element, andthe resonance control portion changes the resonance frequency of the resonator by applying stress to the FBG in a direction of extension of this FBG.2. The light source device according to claim 1 , wherein the intensity control portion controls the intensity of the harmonic by disturbing a phase matching condition of the laser light in the harmonic ...

TUNABLE HYBRID LASER WITH CARRIER-INDUCED PHASE CONTROL

A tunable laser includes a substrate comprising a silicon material, a gain medium coupled to the substrate, wherein the gain medium includes a compound semiconductor material, and a waveguide disposed in the substrate and optically coupled to the gain medium. The tunable laser also includes a first wavelength selective element characterized by a first reflectance spectrum and disposed in the substrate and a carrier-based phase modulator optically coupled to the first wavelength selective element. The tunable laser further includes a second wavelength selective element characterized by a second reflectance spectrum and disposed in the substrate, an optical coupler disposed in the substrate and optically coupled to the first wavelength selective element, the second wavelength selective element, and the waveguide, and an output mirror. 1. A tunable laser comprising:a substrate comprising a silicon material;a gain medium coupled to the substrate, wherein the gain medium includes a compound semiconductor material;a waveguide disposed in the substrate and optically coupled to the gain medium;a first wavelength selective element characterized by a first reflectance spectrum and disposed in the substrate;a carrier-based phase modulator optically coupled to the first wavelength selective element;a second wavelength selective element characterized by a second reflectance spectrum and disposed in the substrate;an optical coupler disposed in the substrate and optically coupled to the first wavelength selective element, the second wavelength selective element, and the waveguide; andan output mirror.2. The tunable laser of wherein the first carrier-based phase modulator comprises a p-i-n diode optically coupled to a waveguide disposed between the optical coupler and the first wavelength selective element.3. The tunable laser of further comprising a second carrier-based phase modulator optically coupled to the second waveguide selective element.4. The tunable laser of wherein the ...

Suppression Of Parasitic Optical Feedback In Pulse Laser Systems

A pulsed laser system includes a variable attenuator located in a secondary optical path bounded by a target surface and one or more reflective surfaces outside of the primary laser oscillator of the laser system. The variable attenuator isolates an output optical amplifier of the laser system from light reflected from the target during time periods between laser pulses. In some embodiments, the variable attenuator is synchronously controlled with the primary laser oscillator. In some other embodiments, the variable attenuator is controlled separately from the primary laser oscillator to shape the generated laser pulses. 1. A laser system comprising:a primary laser oscillator having a first optical cavity, a first variable attenuator, and an output coupler, the primary laser oscillator operable to generate an amount of pulsed laser light emitted from the output coupler;an output optical amplifier operable to receive the amount of pulsed laser light generated by the primary laser oscillator and generate an amount of amplified pulsed laser light emitted from an exit window of the laser system;a second variable attenuator disposed in an optical path of the laser system between the output coupler and the exit window, wherein the second variable attenuator is operable to isolate the laser system from an amount of light reflected from a target during a time between laser pulses of the amplified pulsed laser light.2. The laser system of claim 1 , further comprising:a driver coupled to the first variable attenuator and the second variable attenuator, wherein the driver generates a synchronous control signal communicated to both the first and second variable attenuators such that the first and second variable attenuators change state to allow a pulse of amplified laser light to exit the exit window.3. The laser system of claim 2 , further comprising:a controller configured to generate a command signal communicated to the driver, wherein the driver generates the synchronous ...

TUNABLE LASER MODULE

The present disclosure relates to a tunable laser module including a light gain area unit for outputting an optical signal; an optical distributor for separating the optical signal output from the light gain area unit; two comb reflection units for reflecting a part of optical signals separated by the optical distributor and allow a part of the optical signals to penetrate; two phase units for changing phases of the optical signals penetrating the two comb reflection units; an optical coupler for combining the optical signals of which the phases are changed by the two phase units; and an optical amplifier for amplifying the optical signal combined by the optical coupler, wherein the light gain area unit oscillates a laser by totally reflecting the optical signals reflected by the two comb reflection units. 1. A tunable laser module , comprising:a light gain area unit configured to output an optical signal;an optical distributor configured to separate the optical signal output from the light gain area unit;two comb reflection units configured to reflect a part of optical signals separated by the optical distributor and allow a part of the optical signals to penetrate;two phase units configured to change phases of the optical signals penetrating the two comb reflection units;an optical coupler configured to combine the optical signals of which the phases are changed by the two phase units; andan optical amplifier configured to amplify the optical signal combined by the optical coupler,wherein the light gain area unit oscillates a laser by totally reflecting the optical signals reflected by the two comb reflection units.2. The tunable laser module of claim 1 , wherein each of the two comb reflection units comprises a grating distributed Bragg reflector or a ring resonator.3. The tunable laser module of claim 1 , wherein the two comb reflection units have an identical reflectivity and different free spectral ranges.4. The tunable laser module of claim 1 , wherein output ...

Pulsed Laser Source with High Repetition Rate

Methods and systems for generating pulses of laser radiation at higher repetition rates than those of available excimer lasers are disclosed that use multiple electronic triggers for multiple laser units and arrange the timings of the different triggers with successive delays, each delay being a fraction of the interval between two successive pulses of a single laser unit. Methods and systems for exposing nanoscale patterns using such high-repetition-rate lasers are disclosed. 18-. (canceled)9. The method of generating pulses of laser radiation at high repetition rates , comprising the steps of:(a) providing at least two laser units, each capable of producing pulses of laser radiation at a repetition rate of F (pulses per second), and capable of being triggered by external low-voltage pulse triggers;(b) providing an electronic pulse generator unit, capable of producing low-voltage trigger pulses that have a repetition rate of 2×F or greater, and capable of triggering said laser units of step (a);(b.1) providing at least one electronic delay unit, capable of accepting the pulses from said pulse generator of step (b) as inputs and providing output pulses that are delayed from said inputs by specified time instants;(c) triggering one of said laser units of step (a) by one sub-set of trigger pulses produced by said pulse generator of step (b); delaying another sub-set of trigger pulses from said pulse generator using one of said electronic delay units of step (b.1); triggering another of said laser units of step (a) by said delayed pulses produced by said electronic delay unit; and triggering other laser units of step (a) by other delayed trigger pulses produced by other electronic delay units to which inputs are other sub-sets of trigger pulses from said pulse generator of step (b);(d) providing a timing data file having the timing instants at which all the laser pulses from all the said laser units of step (a) are to be emitted; and(e) using the timing data file of ...

Array Comprising a Plurality of Adjustable Optical Devices

An adjustable array includes a plurality of optical devices. Each adjustable array device has an optical light output therefrom and is configured whereby the corresponding optical lights of the plurality of optical devices have a predefined nonequivalent relationship relative to one another with respect to an output parameter. In response to a drive signal, the plurality of optical devices are further configured to adjust the corresponding optical lights with respect to the output parameter while substantially maintaining the predefined nonequivalent relationship. 1. An adjustable array device , including:a plurality of optical devices each having an optical light output therefrom and configured whereby the corresponding optical lights of the plurality of optical devices have a predefined nonequivalent relationship relative to one another with respect to an output parameter, andwherein, in response to a drive signal, the plurality of optical devices are further configured to adjust the corresponding optical lights with respect to the output parameter while substantially maintaining the predefined nonequivalent relationship.2. The adjustable array device of claim 1 , wherein the output parameter is at least one of wavelength claim 1 , frequency claim 1 , power claim 1 , or phase.3. The adjustable array device of claim 1 , wherein each of the plurality of optical devices comprises at least one adjustment section that claim 1 , in response to the drive signal claim 1 , adjusts the corresponding optical lights with respect to the output parameter while substantially maintaining the predefined nonequivalent relationship claim 1 , the adjustable array device further including a controller coupled to and configured to output the drive signal to the corresponding at least one adjustment section of the plurality of optical devices.4. (canceled)5. (canceled)6. The adjustable array device of claim 3 , wherein the drive signal comprises multiple signals originating from a main ...

GENERATING ULTRASHORT LASER PULSES BASED ON TWO-STAGE PULSE PROCESSING

Techniques and devices for producing short laser pulses, including generating ultrashort laser pulses by separating a nonlinear processing of laser pulses via nonlinear self-phase modulation (SPM) in a nonlinear optical medium from a subsequent linear processing of the laser pulses to achieve ultrashort laser pulses. 1. A method for generating ultrashort laser pulses by separating a nonlinear processing of laser pulses via nonlinear self-phase modulation (SPM) in a nonlinear optical medium from a subsequent linear processing of the laser pulses to achieve ultrashort laser pulses , comprising:directing input laser pulses into a nonlinear optical processing module to have an optical intensity that reaches at or above an intensity threshold for SPM in the nonlinear optical processing module to cause spectral broadening of, and an amount of frequency chirp in, each of the laser pulses due to the nonlinear SPM;controlling an intensity of spectrally broadened laser pulses output from the nonlinear optical processing module to be below a nonlinear intensity threshold level for nonlinear SPM in a linear optical processing module with anomalous dispersion that is optically coupled to receive the spectrally broadened laser pulses output from the nonlinear optical processing module without causing optical nonlinearity or the nonlinear SPM; andconfiguring a length of optical propagation of the linear optical processing module to cause an amount of anomalous optical dispersion in the spectrally broadened laser pulses that compensates for the frequency chirp produced by the nonlinear optical processing module and causes compression of a pulse width in time to produce output laser pulses that are spectrally broadened and are compressed in the pulse duration in time with respect to a spectral width and a pulse duration of the input laser pulses.2. The method as in claim 1 , further compressing:controlling properties of the nonlinear optical processing module and the linear optical ...

Laser system and method of operation

An exemplary laser system is disclosed which includes a pump laser diode array and laser gain material, in which the array generates optical radiation having a predetermined total linewidth approximately 20 nm wide constructed from a plurality of individual wavelengths with a linewidth of up to 8 nm, the centre wavelength of radiation being for example within the absorption band of laser gain material used at the centre point of the operating temperature of the array. The system can include a highly reflecting plane mirror with periodic transmitting patches placed between the laser diode array and the laser gain material, the size of the transmitting patches being such that minimal pump radiation is lost.

FIBER LASER APPARATUS AND METHOD OF DETECTING FAILURE OF FIBER LASER APPARATUS

A fiber laser apparatus in which pump light is introduced into an optical fiber to generate laser light includes a detecting section that detects signal light leaking out from a core of the optical fiber as leakage signal light, a determining section that determines that, in a case where there is a decrease in an intensity of the leakage signal light detected in the detecting section, a failure of the fiber has occurred, and a stopping section that stops, in a case where the determining section has determined that a failure of the fiber has occurred, the introduction of the pump light into the optical fiber. The detecting section detects the leakage signal light leaking out of a High Reflectivity FBG that is provided on a side opposite to an output side of the laser light. 1. A fiber laser apparatus in which pump light is introduced into an optical fiber to generate laser light , the fiber laser apparatus comprising:a detecting section that detects signal light leaking out from a core of the optical fiber as leakage signal light;a determining section that determines that, in a case where there is a decrease in an intensity of the leakage signal light detected in the detecting section, a failure of the fiber has occurred; anda stopping section that stops, in a case where the determining section has determined that a failure of the fiber has occurred, the introduction of the pump light into the optical fiber,the detecting section detecting the leakage signal light leaking out of a High Reflectivity FBG that is provided on a side opposite to an output side of the laser light.2. The fiber laser apparatus according to claim 1 , further comprising a forward pumping light-multiplexer that multiplexes the laser light for pumping claim 1 ,wherein the detecting section detects the leakage signal light that leaks out nearer a terminal end of the forward pumping light-multiplexer.3. The fiber laser apparatus according to claim 2 , wherein claim 2 , in a case where an intensity ...

BROADBAND OPTICAL ACCUMULATOR AND TUNABLE LASER USING A SUPERCONTINUUM CAVITY

A broadband optical accumulator and tunable narrowband optical source use a microstructured optical fiber into which optical energy is coupled at a first wavelength. The input optical energy is spectrally broadened as it propagates through the fiber, and the output signal is directed to a wavelength separator such as a Bragg grating. A narrowband portion of the output signal is redirected by the grating, while the remainder is reinjected into the fiber. Adjustment of the output wavelength band may be accomplished by changing the incidence angle of the output signal by pivoting the grating. The grating may be located in a housing and surrounded by index matching fluid, and the narrowband portion of the output signal isolated by the grating may be redirected to an output location by a reflector that moves with pivoting of the grating. 1. A broadband optical accumulator comprising:an optical fiber apparatus having a microstructured optical fiber configured such that an optical signal present in the fiber propagates repeatedly therewithin;a narrowband optical source that generates optical energy in a first narrow wavelength band; andan injection apparatus that couples the first narrow wavelength band optical energy into a first end of the fiber, said narrowband optical energy undergoing spectral broadening as it propagates within the fiber cavity.2. A broadband optical accumulator according to wherein optical energy coupled into the first end of the fiber exits a second end of the fiber claim 1 , and wherein the optical fiber apparatus is configured such that optical energy exiting the second end of the fiber is coupled back into the first end of the fiber.3. A broadband optical generator according to wherein the injection apparatus comprises a wavelength dependent element located in an optical path of the optical energy exiting the second end of the fiber claim 1 , the wavelength dependent element redirecting the optical energy from the optical source toward the first ...

Laser light source module

The present invention provides a laser light source module thereby providing better prevention against actions taken to use the laser light for purposes other than the intended purpose, and a laser light source module according to the present invention provides a laser light source module including a laser element that emits laser light, the laser light source module being formed by a combination of a plurality of members, the laser light source module including: a laser element drive circuit including a memory that stores a password, said laser element drive circuit making said laser element emit laser light if an input password that has been input matches the password stored in said memory; and a laser element destruction mechanism that, if the plurality of members are separated, destroys said laser element.

Raman Amplifiers

A pump unit () for a Raman amplifier () including an optical fibre () carrying an optical signal () is disclosed. The pump unit includes at least two light sources () for emitting light at different wavelengths into the fibre to induce Raman gain of the optical signal passing along the fibre, and a controller () for providing pulses to each of the light sources to control when they do and do not emit light. The controller is configured to control the width of the pulses to control the total power of the light emitted into the fibre. 1. A pump unit for a Raman amplifier having an optical fibre carrying an optical signal , the pump unit comprising:at least two light sources for emitting light at different wavelengths into the fibre to induce Raman gain of the optical signal passing along the fibre; anda controller for providing pulses to each of the light sources to control when they do and do not emit light, control the width of the pulses to control the total power of the light emitted into the fibre, and', 'optimise overlap times during which the light sources are activated simultaneously so that the overlap time between the light sources is minimised when light from one light source falls near the peak of a Raman gain spectrum produced from light of another light source., 'wherein the controller is configured to2. The pump unit according to claim 1 , wherein the controller comprises a pulse width modulation claim 1 , PWM claim 1 , unit for varying the width of the pulses.3. The pump unit according to claim 1 , wherein the controller is configured to vary the duty cycles of the pulses to each of the light sources in response to changes in gain conditions claim 1 , bandwidth and/or channel allocation in the amplifier.4. The pump unit according to claim 1 , configured to allow a long overlap time between two light sources when light from the two sources does not interact strongly.5. The pump unit according to claim 1 , wherein each of the light sources is configured ...

Holographic display systems, methods and devices

Systems, devices and methods are described including providing infrared (IR) laser radiation to a Digital Micromirror Device (DMD) array and using the DMD array to spatially modulate the IR laser radiation. The spatially modulated IR laser radiation may then be projected to form a voxel array where each voxel of the array represents to a volume of air wherein the IR laser radiation has been focused sufficiently to cause air to ionize. The voxel array may then be spatially rotated.

MODULATOR INTEGRATED LASER DEVICE

An integrated optical modulator and laser device includes a laser section, a modulator section for modulating the intensity of a laser beam produced by the laser section, and a separation section located between the laser section and the modulator section. The laser section includes a first anode electrode and a first cathode electrode. The modulator section includes a second anode electrode and a second cathode electrode. A lower cladding layer is integral to the laser section, the modulator section, and the separation section and the width of the lower cladding layer is narrowest in the separation section. 1. A modulator integrated laser device comprising:a substratea laser section on said substrate,a separation section on said substrate, and said laser section has a first lower cladding layer on said substrate, an active layer on said first lower cladding layer, a first anode electrode above said active layer, and a first cathode electrode having a portion in contact with said first lower cladding layer,', 'said separation section has a second lower cladding layer on said substrate and in contact with said laser section, and a first absorption layer on said second lower cladding layer and connected to said active layer,', 'said modulator section has a third lower cladding layer on said substrate and in contact with said separation section, a second absorption layer on said third lower cladding layer and connected to said first absorption layer, a second anode electrode above said second absorption layer, and a second cathode electrode having a portion in contact with said third lower cladding layer,', 'said substrate is a semi-insulating material,', 'said first lower cladding layer, said second lower cladding layer, said third lower cladding layer are integrated with each other, and', 'said second lower cladding layer has a width in the transverse direction of said modulator integrated laser device that is smaller than width of said first lower cladding layer and ...

Device for Amplifying a Laser Beam

A device for amplifying a laser beam is provided. The device includes at least one amplifier chamber in which a laser-active material is provided, at least one transmitting optical member delimiting the amplifier chamber and being arranged at a tilt angle, α, with respect to a plane oriented perpendicularly with respect to an optical axis of the laser beam, and at least one detection unit. The laser beam is reflected by the transmitting optical member into a back reflected laser beam, and the detection unit is arranged such that it detects the back reflected laser beam. 1. A device for amplifying a laser beam , comprising:at least one amplifier chamber with a laser-active material therein;at least one transmitting optical member delimiting the at least one amplifier chamber and being arranged at a tilt angle, α, with respect to a plane oriented perpendicularly with respect to an optical axis of the laser beam; anda detection unit arranged such that it detects a laser beam back reflected at the transmitting optical member.2. The device according to claim 1 , wherein the laser-active material is a laser-active gas.3. The device according to claim 2 , wherein the laser-active gas is CO2.4. The device according to claim 1 , wherein the tilt angle claim 1 , α claim 1 , is within a range from 1° to 20°.5. The device according to claim 1 , wherein the detection unit is arranged outside the at least one amplifier chamber.6. The device according to claim 1 , comprising at least one additional amplifier chamber claim 1 , or at least one additional chamber claim 1 , comprising a gas composition and/or a pressure different from the gas composition and/or the pressure in the amplifier chamber.7. The device according to claim 1 , wherein the at least one transmitting optical member delimits the at least one amplifier chamber from a directly adjacent amplifier chamber or from an additional chamber.8. The device according to claim 1 , further comprising at least one deflection ...

LASER APPARATUS

A laser apparatus may include a first laser light source configured to emit light with a first wavelength, a second laser light source including a titanium-sapphire laser device and a plurality of wavelength conversion elements and being configured to emit light with a second wavelength being one-fourth of a wavelength of light emitted from the titanium-sapphire laser device, and a wavelength conversion element configured in such a manner that the light with the first wavelength and the light with the second wavelength are incident thereon to emit light with a wavelength of about 193 nm corresponding to a sub frequency of the light with the first wavelength and the light with the second wavelength. 1. A laser apparatus , comprising:a first laser light source configured to emit light with a first wavelength;a second laser light source configured to emit light with a second wavelength; anda wavelength conversion unit configured in such a manner that the light with the first wavelength and the light with the second wavelength are incident thereon to emit light with a wavelength of about 193 nm.2. The laser apparatus as claimed in claim 1 , wherein the second laser light source includes a titanium-sapphire laser device and a plurality of wavelength conversion elements claim 1 , the second wavelength is one-fourth of a wavelength of light emitted from the titanium-sapphire laser device claim 1 , and the wavelength of about 193 nm corresponds to a sum frequency of the light with the first wavelength and the light with the second wavelength.3. The laser apparatus as claimed in claim 1 , wherein the first laser light source includes a fiber laser amplifier claim 1 , the second laser light source includes a fiber laser amplifier claim 1 , the wavelength conversion unit includes a plurality of wavelength conversion elements claim 1 , and the wavelength of about 193 nm corresponds to a sum frequency of light with a wavelength being one-fourth of the first wavelength and light ...

OPTICALLY LOCKED HIGH ENERGY OPO-OPA

Systems and methods for producing high-energy, pico-second laser pulses are disclosed. Systems and methods include using a modelocked laser source to drive an OPO (optical parametric oscillator) and an OPA (optical parametric amplifier) such that the OPA and OPO self-synchronize without the use of separate synchronization components and produce high-energy output without requiring pulse stretchers or pulse compressors, making the laser system viable for portability and vehicle mounting from both cost and durability standpoints. 1. An optically locked high-energy self-synchronizing laser amplification system , the system comprising:a modelocked laser source;an optical parametric oscillator (OPO), where said oscillator is driven by a pulse sequence from said modelocked laser source; andan optical parametric amplifier (OPA);wherein a timing of said pulse sequence is based on a size of the OPA optical cavity; andwherein the OPA is driven by at least a portion of the pulse sequence, thereby causing the OPO and OPA to self-synchronize.2. The system of claim 1 , wherein said OPA includes a first OPA serially disposed and optically connected with a second OPA.3. The system of claim 1 , wherein the modelocked laser source is a pico-second laser.4. The system of claim 1 , wherein the OPA is a double-pass OPA.5. The system of claim 1 , the system further comprising a first feedback loop that includes:a first optical isolator disposed in an optical path between the modelocked laser source and the OPO;at least one mirror disposed in an optical path between the OPO and said OPA;a second optical isolator disposed in an optical path between said mirror and said first optical isolator; anda first laser amplifier disposed in an optical path between said first optical isolator and said second optical isolator.6. The system of claim 5 , the system further comprising a second feedback look that includes:at least a second mirror disposed in an optical path between the first OPA and the ...

COMPACT HIGH ENERGY MID WAVE OPCPA LASER

Systems and methods of optical parametric chirped pulse amplification for laser pulses are provided. Techniques and components include replacing pulse stretcher and/or pulse compressors with chirped volume Bragg gratings (CVBGs) to reduce size, weight, cost, and environmental sensitivity of the laser system. 1. A chirped pulse amplification (CPA) laser system , the system comprising:a seed laser;a pump laser;an amplifier having an input side and an output side, where the seed laser and the pump laser are disposed on the input side of the amplifier;a chirped volume Bragg grating (CVBG) pulse stretcher disposed between the seed laser and the input side the amplifier; anda grating compressor disposed on the output side of the amplifier.2. The CPA laser system of claim 1 , where the seed laser is a near-infrared laser having a wavelength of less than 2.9 μm.3. The CPA laser system of claim 1 , the system further comprising a ruggedized enclosure that protects system components from damage claim 1 , mis-alignment claim 1 , and/or malfunction due to environmental factors.4. The CPA laser system of claim 1 , where the grating compressor is also a CVBG.5. The CPA laser system of claim 1 , where the amplifier includes an optical parametric amplifier (OPA).6. The CPA laser system of claim 1 , where the amplifier is configured to generate a signal output pulse and an idler output pulse.7. The CPA laser system of claim 6 , the system further comprising:an idler extraction module disposed on the output side of the amplifier between the amplifier and the grating compressor; andan idler grating compressor disposed on the output side of the amplifier such that it receives an idler pulse extracted by the idler extraction module.8. The CPA laser system of claim 7 , where the idler grating compressor is also a CVBG.9. (canceled)10. The CPA laser system of claim 8 , where the CVBG idler grating compressor has the same chirp and same sign as the CVBG pulse stretcher.11. The CPA laser ...

Method and Apparatus for the Line Narrowing of Diode Lasers

A system for narrowing the spectral output of diode lasers through the use of dielectric stacks in the laser cavity comprising an alternating sequence of layers of dielectric material and air, which dielectric stacks are fabricated through the controlled laser ablation of the dielectric material.

HIGHLY EFFICIENT 3rd HARMONIC GENERATION IN Nd: YAG LASER

The specification and drawings present an apparatus and a method for intra-cavity harmonic generation in lasers such as solid-state lasers using a multi-resonance cavity with meniscus lenses for focusing corresponding wavelength radiation components on non-linear optical elements such as non-linear optical crystals using type I or type II phase-matching for significantly increasing efficiency of the harmonic conversion and output powers of generated harmonics. Using only type I or only type II phase-matching for all non-linear crystals may eliminate the requirement of linear-polarization on the fundamental laser wavelength generation. For example, a highly efficient UV Nd:YAG laser at 355 nm (a third harmonic of the fundamental wavelength of 1064 nm for the Nd:YAG laser) using intra-cavity triple resonance cavity and meniscus lenses has been developed using embodiments described herein.

LASER-BASED SOURCE FOR TERAHERTZ AND MILLIMETER WAVES

A multi-wavelength VECSEL includes an active region comprising a plurality of semiconductor quantum wells having an intrinsically broadened gain with a wavelength selective filter disposed within the cavity to provide a laser output that oscillates at two or more separated wavelengths simultaneously. A non-linear crystal may be provided in the cavity to emit radiation at a frequency in the THz range that is the difference of the frequencies associated with two of the separated wavelengths. 1. A multi-wavelength vertical external cavity surface emitting laser system , comprising:at least one laser chip having an intrinsically broadened active region;an external cavity in optical communication with the laser chip to receive optical radiation emitted by the laser chip and configured to support lasing;a wavelength selective filter in optical communication with the laser chip, the wavelength selective filter configured to provide a laser that oscillates at two or more separated wavelengths simultaneously; anda nonlinear medium disposed within the cavity for receiving optical radiation of the two or more separated wavelengths, the nonlinear medium configured to emit radiation at a frequency that is the difference of the frequencies associated with two of the separated wavelengths.2. (canceled)3. A multi-wavelength laser system according to claim 1 , wherein the nonlinear medium is configured to emit terahertz radiation.4. A multi-wavelength laser system according to claim 1 , wherein the nonlinear medium comprises lithium niobate.5. A multi-wavelength laser system according to claim 4 , wherein the nonlinear medium comprises a periodically poled material.6. A multi-wavelength laser system according to claim 5 , wherein the nonlinear medium is configured to emit terahertz radiation in the range of about 100 GHz to about 10 THz.7. A multi-wavelength laser system according to claim 1 , wherein the wavelength selective filter is disposed within the cavity.8. A multi- ...

DIFFRACTIVE OPTICAL ELEMENTS FOR TRANSFORMATION OF MODES IN LASERS

Spatial mode conversion modules are described, with the capability of efficiently transforming a given optical beam profile, at one plane in space into another well-defined optical beam profile at a different plane in space, whose detailed spatial features and symmetry properties can, in general, differ significantly. The modules are comprised of passive, high-efficiency, low-loss diffractive optical elements, combined with Fourier transform optics. Design rules are described that employ phase retrieval techniques and associated algorithms to determine the necessary profiles of the diffractive optical components. System augmentations are described that utilize real-time adaptive optical techniques for enhanced performance as well as power scaling. 1. An apparatus , comprising:a first diffractive optical element (DOE) configured to transform the phase of an input beam into a plurality of output beams having a predetermined intensity distribution; anda second DOE configured to impart a predetermined phase onto said plurality of output beams to produce a higher order mode (HOM) output beam that comprises said predetermined intensity distributions and said predetermined phase.2. The apparatus of claim 1 , wherein said input beam comprises a fundamental mode and wherein said predetermined intensity distribution is spatially configured to match a desired multi-lobed higher order mode (HOM).3. The apparatus of claim 2 , wherein said first DOE comprises a first phase plate and wherein said second DOE comprises a second phase plate.4. The apparatus of claim 3 , wherein said second phase plate is configured to impart the requisite amount of phase shift across said predetermined intensity distribution to achieve multiple lobes whose phase alternates between 0 and π to produce said HOM output beam.5. The apparatus of claim 4 , further comprising a rectangular core ribbon fiber configured to receive and propagate said HOM mode output beam.6. The apparatus of claim 5 , wherein ...

HIGH SPECTRAL-PURITY CARRIER WAVE GENERATION BY NONLINEAR OPTICAL MIXING

Signal generating systems and methods are described. One signal generation system includes first and second lasers configured to generate first and second laser beams having respective frequencies wherein a difference in the respective frequencies corresponds to an output frequency, a photodetector configured to produce a signal at the output frequency, and first and second electro-optic modulators configured to respectively electro-optically modulate the first and second laser beams using the signal to produce respective first and second modulated optical signals, each of the first and second modulated optical signals having a respective sideband corresponding to the frequency of the other one of the first and second laser beams. The first laser is seeded with the respective sideband of the second modulated optical signal and the second laser is seeded with the respective sideband of the first modulated optical signal to phase-lock the first and second laser beams to each other. 1. A signal generating system comprising:first and second lasers configured to generate first and second laser beams having respective frequencies wherein a difference in the respective frequencies corresponds to an output frequency;a photodetector configured to mix the first and second laser beams to produce a signal at the output frequency; and 'wherein the first laser is seeded with the respective sideband of the second modulated optical signal and the second laser is seeded with the respective sideband of the first modulated optical signal to phase-lock the first and second laser beams to each other.', 'first and second electro-optic modulators (EOMs) configured to respectively electro-optically modulate the first and second laser beams using the signal to produce respective first and second modulated optical signals, each of the first and second modulated optical signals having a respective sideband corresponding to the frequency of the other one of the first and second laser beams,'}2 ...

Optical Amplifying Apparatus and Optical Transmission System

An optical amplifying apparatus that amplifies a wavelength-division multiplexed (WDM) optical signal includes an input section, a laser light source, a double-clad optical fiber, a gain equalizer, and a residual pump light attenuating section that attenuates a residual pump light outputted from the double-clad optical fiber. The residual pump light attenuating section is disposed such that the residual pump light of the laser light is incident on the residual pump light attenuating section before being incident on an isolator. 1. An optical amplifying apparatus that amplifies a wavelength-division multiplexed optical signal , comprising:an input section whereto the wavelength-division multiplexed optical signal is inputted;a laser light source that generates multimode laser light;a double-clad optical fiber having a cladding portion whereto the multimode laser light is inputted and a core portion doped with a rare-earth element whereto the wavelength-division multiplexed optical signal is inputted, the double-clad optical fiber amplifying optical signals of a plurality of wavelengths in the wavelength-division multiplexed optical signal by a stimulated emission by the multimode laser light;a gain equalizer that flattens a gain characteristic of the wavelength-division multiplexed optical signal that has been amplified by the double-clad optical fiber;an output section that outputs the amplified wavelength-division multiplexed optical signal; anda residual pump light attenuating section that attenuates a residual pump light outputted from the double-clad optical fiber,the residual pump light attenuating section being disposed in such a manner that the residual pump light of the multimode laser light which has propagated through the double-clad optical fiber is incident on the residual pump light attenuating section before being incident on an isolator.2. An optical amplifying apparatus that amplifies a wavelength-division multiplexed optical signal , comprising:an ...

Method and Apparatus for Reducing the Amplitude Modulation of Optical Signals in External Cavity Lasers

A laser apparatus includes an external cavity laser (ECL) where the optical signal is modulated by an electrical modulation signal for modulating in frequency the laser output signal. The modulation in frequency produces a modulation of intensity (power) of the laser output signal, also denoted amplitude modulation (AM). A method of controlling the AM amplitude of a signal emitted by an ECL includes a gain medium, a phase element with variable transmissivity induced by the modulation, and a spectrally selective optical filter that selects and keeps the AM amplitude below a certain desired value or minimizes such value. A control method and a laser apparatus are also described in which the reduction of the AM component of the output power is achieved by acting on the gain of the gain medium of the ECL. 1. A method of operating a laser that emits an output optical signal at a central laser frequency and that comprises an external cavity including a semiconductor gain medium and a phase element whose phase is controllable through a control parameter , the method comprising:applying a first electrical modulation signal to the control parameter so as to create a modulation of a length of a cavity optical path at a modulation frequency and with a first modulation depth that causes an optical frequency excursion and an amplitude modulation of the output optical signal;simultaneously applying a second electrical modulation signal to the gain medium at the modulation frequency and at a second modulation depth;detecting a modulation amplitude of the output optical signal; andadjusting the second modulation depth based on an analysis of the modulation amplitude of the laser output signal.2. The method of claim 1 , wherein the first phase element has an optical transmissivity that substantially decreases with an increase in the control parameter at least within its variation induced by the first modulation signal and wherein the first modulation signal is substantially in phase ...

System For Driving Pulsed Laser Diode Pump

A power supply for laser systems is configured with a DC power source having an output source voltage, an energy accumulator operatively connected to the output of the DC power source, and a pump. Coupled between the accumulator and source is a first DC to DC stage with at least one switched-mode power converter which is operative to charge the accumulator with voltage. The charged voltage may be same or different from the source voltage. The power supply further includes a second DC to DC stage with at least one switched-mode power converter coupled between the accumulator and pump and operative to discharge accumulator to the same or different output voltage. The DC to DC converters are configured so that current pulses at the input of the pump each have a peak value greater than the power source current.

LASER APPARATUS

A laser apparatus may include an optical resonator, a laser chamber, an optical loss adjustment mechanism, and a spectral line width adjustment mechanism. The optical resonator includes a mirror configured to reflect a part of light and a grating. The laser chamber is provided in the optical resonator and contains a laser gain medium, configured to emit a laser beam. The optical loss adjustment mechanism is provided in the optical resonator and configured to adjust an optical loss of the laser beam. The spectral line width adjustment mechanism is provided in the optical resonator and configured to adjust a spectral line width of the laser beam. 1. A laser apparatus comprising:an optical resonator including a mirror configured to reflect a part of light and a grating;a laser chamber configured to emit a laser beam by a power source and a laser gain medium provided in the optical resonator;an optical loss adjustment mechanism provided in the optical resonator and configured to adjust an optical loss of the laser beam; anda spectral line width adjustment mechanism provided in the optical resonator and configured to adjust a spectral line width of the laser beam.2. The laser apparatus as claimed in claim 1 ,wherein the optical loss adjustment mechanism includes a first mirror, a second mirror, a third mirror, a fourth mirror, and a linear stage,the first mirror, the second mirror, the third mirror, and the fourth mirror are arranged so that the laser beam incident on the first mirror reflects on in order of the first mirror, the third mirror, the fourth mirror, and the second mirror,the third mirror and the fourth mirror are placed on the linear stage, andthe linear stage is configured to adjust a first distance between the first mirror and the third mirror and a second distance between the fourth mirror and the second mirror so as to adjust the optical loss of the laser beam.3. The laser apparatus as claimed in claim 1 ,wherein the optical loss adjustment mechanism ...

Translucent polycrystalline material and manufacturing method thereof

Provided is a method for manufacturing a translucent polycrystalline material with optical properties continuously varying in the material. A slurry including single crystal grains that are acted upon by a force when placed in a magnetic field is immobilized in a gradient magnetic field with a spatially varying magnetic flux density and then sintered. For example, where a slurry including single crystal grains of YAG doped with Er and single crystal grains of YAG undoped with a rare earth material is immobilized in the gradient magnetic field, the region with a strong magnetic field becomes a laser oscillation region that is rich in Er-doped YAG, whereas the region with a weak magnetic field becomes a translucent region rich in YAG undoped with a rare earth material. A polycrystalline material having a core with laser oscillations and a guide surrounding the core are obtained at once.

DRIVE LASER FOR EUV LIGHT SOURCE

A device comprising a laser source producing a continuous output on a beam path and an amplifier is disclosed. The device further includes a partially transmissive, partially reflective optic disposed on said beam path between said laser source and said amplifier. The device further includes a droplet generator positioned to deliver a droplet moving on a path intersecting said beam path, the droplet reflecting light to establish an optical cavity with said optic. 1. A device comprising:{'sub': 'o', 'an oscillator having an oscillator cavity length, L, and defining an oscillator path;'}{'sub': combined', 'combined', 'o, 'a multi-pass optical amplifier coupled with said oscillator to establish a combined optical cavity including the oscillator path, the combined cavity having a length, L, where L=(N+x)*L, where “N” is an integer and “x” is a number between 0.4 and 0.6.'}2. A device as recited in wherein said oscillator cavity comprises an optic defining an end of the oscillator cavity and the device comprises an electro-actuable element coupled to the optic and controllable to adjust the oscillator cavity length.3. A device as recited in wherein the amplifier comprises a polarization discriminating optic inputting light traveling along a first beam path from the oscillator and having substantially a first linear polarization into the amplifier and outputting light having substantially a linear polarization orthogonal to said first polarization out of said amplifier along a second beam path.4. A device as recited in wherein the oscillator comprises an oscillator output optic claim 1 , the amplifier comprises an amplifier input optic and the device further comprises at least one moveable optic to adjust a beam path length between said oscillator output optic and said amplifier input optic.5. A device as recited in wherein the oscillator comprises a cavity dumped oscillator.6. A device comprising:a target material;at least one optic establishing a beam path with the ...

APPARATUS AND METHOD FOR MEASURING CONTRAST IN A HIGH POWER LASER SYSTEM

A preferred apparatus can include a high-power laser; a beam splitter; a non-linear optical assembly configured to cube an incident beam; a detector optically configured to receive an input beam from the beam splitter and a reference beam from the non-linear optical assembly; and a controller configured to calculate a fourth order cross correlation of the input beam and the reference beam to characterize the high-power laser. 1. A method comprising:splitting a first laser pulse into an input beam and a reference beam;directing the reference beam to a non-linear optical assembly;detecting the input beam and the reference beam at a detector; andcross-correlating the input beam and the reference beam to characterize the first laser pulse.2. The method of claim 1 , wherein cross-correlating the input beam and the reference beam comprises a fourth order cross correlation.3. The method of claim 1 , wherein splitting the first laser pulse into an input beam and a reference beam comprises splitting the first laser pulse with a 10/90 beam splitter.4. The method of claim 1 , wherein an intensity of the first laser pulse measures approximately 10W/cmintensity per pulse.5. The method of claim 1 , wherein the non-linear optical assembly comprises one or more non-linear optical elements comprising one of: a beam splitter claim 1 , a type I BBO crystal claim 1 , a type II BBO crystal claim 1 , a partially reflective mirror claim 1 , a totally reflective mirror claim 1 , a frequency-selecting optical element claim 1 , a lens claim 1 , or a gradient.6. An apparatus comprising:a high-power laser;a beam splitter;a non-linear optical assembly configured to cube an intensity profile of an incident beam;a detector optically configured to receive an input beam from the beam splitter and a reference beam from the non-linear optical assembly; anda controller configured to calculate a fourth order cross correlation of the input beam and the reference beam to characterize the high-power laser ...

Femtosecond laser apparatus and femtosecond laser system including the same

There is disclosed a femtosecond laser apparatus including a first laser material comprising Ng, Np and Nm axes spatially perpendicular to each other; a second laser material comprising Np axis, Nm axis and Ng axis; and a first laser diode and second laser diodes, wherein the traveling direction of laser beams generated from the first and second laser materials is substantially parallel to Ng axis of the first laser material and the polarizing direction of laser beams generated from the first and second laser materials is substantially parallel to Np axis of the first laser material, and the traveling direction of laser beams generated from the first and second laser materials is substantially parallel to Np axis of the second material and the polarizing direction of laser beams generated from the first and second laser materials is substantially parallel to Nm axis of the second laser material.

Wavelength Conversion Laser System

The present invention relates to a wavelength conversion laser system and provides a wavelength conversion laser system including a semiconductor optical amplifier, an optical condenser that condenses light emitted from the optical amplifier, a diffraction grating plate that induces wavelength components of the light having passed through the optical condenser in different directions, and an optical very large scale integration (VLSI) processor. 1. A wavelength conversion laser system , comprising:an optical amplifier which emit a light with wavelength range and amplify the light;an optical condenser that condenses the light emitted from the optical amplifier;a diffraction grating plate that induces wavelength components of the light having passed through the optical condenser in different directions; andan optical very large scale integration (VLSI) processor that causes a specific wavelength of the light of the induced wavelength components to be returned to the diffraction grating plate, wherein the specific wavelength of the light from the diffraction grating plate pass through the optical condenser and is amplified by the optical amplifier.2. The wavelength conversion laser system of claim 1 , the optical amplifier is optical semiconductor amplifier or optical fiber amplifier.3. The wavelength conversion laser system of claim 1 , wherein the optical very large scale integration (VLSI) processor is replaced by MEMS mirror array.4. A wavelength conversion laser system claim 1 , comprising:a light source;an optical condenser that condenses light emitted from the light source;a diffraction grating plate that induces wavelength components of the light having passed through the optical condenser in different directions;an optical very large scale integration (VLSI) processor that causes a specific wavelength of the light of the induced wavelength components to be returned to the light source; andan optical coupler that is installed between the light source and the ...

Method and laser oscillator for the generation of a laser beam

Method and laser oscillator for the generation of a laser beam—According to the invention with a view to adjusting, inside said laser oscillator ( 1 ), the phase of each of the N elementary laser beams (FLE. 1, FLE. 2, FLE.N) generated on the basis of said laser oscillator ( 1 ) in such a way that said elementary laser beams are in phase, the deviation between the phase of an individual elementary laser beam (FLE. 1 ) and the phases of the N−1 other elementary laser beams (FLE. 2, FLE.N) is converted into a level of luminous intensity by means of at least one optical filtering element to which at least a part of each elementary laser beam is directed.

ULTRAVIOLET LASER DEVICE

An ultraviolet laser device comprises a laser beam output unit that outputs infra-red laser beams, and a wavelength conversion unit that wavelength converts the infra-red laser beams. The laser beam output unit comprises a first laser beam output unit that outputs a first infra-red laser beam whose wavelength is 1900-2000 nm, and a second laser beam output unit that outputs a second infra-red laser beam whose wavelength is 1000-1100 nm. The wavelength conversion unit comprises a first element series that the first infra-red light beam is incident upon and propagated through, and a second element series that the laser light propagated through the first element series and the second infra-red laser beam are incident upon, combined in, and propagated through, and constructed so that ultraviolet laser light is outputted, due to the first and second infra-red laser beams being wavelength converted by optical wavelength conversion elements. 1. An ultraviolet laser device comprising a laser beam output unit that outputs infra-red laser beams , and a wavelength conversion unit comprising optical wavelength conversion elements that wavelength convert the infra-red laser beams outputted from the laser beam output unit into a laser light beam of ultraviolet wavelength that is outputted; wherein:the laser beam output unit comprises a first laser beam output unit that outputs a first infra-red laser beam whose wavelength is 1900 to 2000 nm, and a second laser beam output unit that outputs a second infra-red laser beam whose wavelength is 1000 to 1100 nm;the wavelength conversion unit comprises a first element series that the first infra-red light beam from the first laser beam output unit is incident upon and propagated through, and a second element series that the laser light propagated through the first element series and the second infra-red laser beam outputted from the second laser beam output unit are incident upon, combined in, and propagated through;and constructed so ...

External Cavity Wideband Tunable Laser with Dual Laser Gain Media Coupled by a Thin Film Filter Including

The invention relates to an external cavity wideband tunable laser with dual laser gain media coupled by a thin film filter. The laser comprises: a first laser gain medium, a first laser cavity end mirror arranged on the first laser gain medium, a first intracavity collimating lens, an active optical phase modulator, a tunable acousto-optic filter, an intracavity reflection mirror, an etalon and a total reflection mirror, which are all arranged sequentially inside the laser cavity. The laser further comprises a second laser gain medium, a second laser cavity end mirror arranged on the second laser gain medium, a second intracavity collimating lens, a thin film optical filter for coupling the output light beams emitted from the first laser gain medium and the second laser gain medium, a radio frequency signal source, pumping sources for the two laser gain media, an active optical phase modulator drive source and a laser drive control circuit. The invention expands the output spectrum range of a single tunable laser and is capable of covering C and L spectrum bands. The laser has reliable performance with stable output and compact size, low cost for volume production and easy installation. 1. An external cavity wideband tunable laser with dual laser gain media coupled by a thin film filter including: a first laser gain medium , a first laser cavity end mirror arranged on the first laser gain medium , a first intracavity collimating lens , an active optical phase modulator , a tunable acousto-optic filter , an intracavity reflection mirror , which are all arranged sequentially , an etalon and a total reflection mirror , which are arranged on the opposite side of the tunable acousto-optic filter from the intracavity reflection mirror , the laser further comprises:a second laser gain medium, a second laser cavity end mirror arranged on the second laser gain medium, a second intracavity collimating lens, the optical axes of second laser gain medium and the second ...

Frequency Tunable Wire Lasers

The present invention provides frequency tunable solid-state radiation-generating devices, such as lasers and amplifiers, whose active medium has a size in at least one transverse dimension (e.g., its width) that is much smaller than the wavelength of radiation generated and/or amplified within the active medium. In such devices, a fraction of radiation travels as an evanescent propagating mode outside the active medium. It has been discovered that in such devices the radiation frequency can be tuned by the interaction of a tuning mechanism with the propagating evanescent mode. 140.-. (canceled)41. A Terahertz amplifier , comprising an amplification region for amplifying an incoming radiation signal having a frequency in a range of about 1 THz to about 10 THz to generate an amplified signal , characterized by a transverse distribution of the amplified signal such that a fraction of said signal extends outside the amplification region as the radiation signal propagates along the amplification region , an input port for coupling said incoming radiation into said amplification region , an exit port for extracting said amplified signal from said amplification region , and a tuning element external to said amplification region , said element being movable relative to said amplification region for interacting with the amplified signal extending outside the amplification region so as to change a frequency of said amplified signal.42. A tunable radiation source , comprising: an incoherent radiation source having an active medium for generating radiation , at least a portion of said radiation propagating along the active medium as a propagating evanescent wave; and a frequency tuning element external to said incoherent radiation source , said frequency tuning element being movable relative to said incoherent radiation source for interacting with the propagating evanescent wave in order to adjust a transverse mode profile of the radiation in the active medium , thereby ...