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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 1026. Отображено 100.
03-05-2012 дата публикации

Heat sink for a pulsed high-power laser diode

Номер: US20120106582A1
Автор: Hans-Jochen Schwarz, Werner Herden, Wolfgang Pittroff
Принадлежит: ROBERT BOSCH GMBH

A semiconductor laser module having a substrate and having at least one semiconductor laser situated on the substrate, the substrate having a layer structure which includes at least one primary layer which establishes a thermal contact with the semiconductor laser. The semiconductor laser is designed in such a way that it emits heat pulses having a minimum specific heat of approximately 3 mJ per mm 2 , preferably approximately 5 mJ/mm 2 , and having a pulse duration of approximately 100 μs to approximately 2,000 μs, and the primary layer has a layer thickness which is between approximately 200 μm and approximately 2,000 μm, preferably between approximately 400 μm and approximately 2,000 μm.

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Номер записи: 1
24-01-2013 дата публикации

Frequency Control of Despeckling

Номер: US20130021586A1
Автор: Barret Lippey
Принадлежит: Laser Light Engines Inc

A method and apparatus that reduces laser speckle by using stimulated Raman scattering in an optical fiber. The pulse repetition frequency of the laser is adjusted to control aspects of the laser light such as color or despeckling. In DLP projection systems, an optical monitor may be used to send information to a bit sequence, and the bit sequence may control the pulse repetition frequency of the laser based on the optical monitor signal.

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Номер записи: 2
21-11-2013 дата публикации

System For Driving Pulsed Laser Diode Pump

Номер: US20130308668A1
Автор: Sergey Guskov
Принадлежит: IPG Photonics Corp

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.

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Номер записи: 3
02-01-2020 дата публикации

POWER POLISHING APPARATUSES AND METHODS FOR IN-SITU FINISHING AND COATING OF OPTICAL COMPONENT

Номер: US20200001423A1
Автор: Bagwell Joel, Carlie Nathan
Принадлежит: Edmund Optics, Inc.

A finishing and coating apparatus is configured for power polishing optical components. The apparatus includes a housing, a substrate holder, a vacuum pump system, a laser, and a coating source. The housing defines a chamber and the substrate holder is disposed within the chamber and configured to hold one or more optical components. The vacuum pump system is configured to create a vacuum within the chamber. The laser includes a laser engine and a laser beam delivery apparatus configured to direct a beam from the laser engine toward the one or more optical components. The laser is configured to finish the one or more optical components prior to coating the one or more optical components. 1. A finishing and coating apparatus comprising:a housing defining a chamber;a substrate holder disposed within the chamber configured to hold one or more optical components;a vacuum pump system configured to create a vacuum within the chamber; a laser engine; and', 'a laser beam delivery apparatus configured to direct a beam from the laser engine toward the one or more optical components; and, 'a laser comprisinga coating source;wherein the laser is configured to finish the one or more optical components prior to coating of the one or more optical components.2. The finishing and coating apparatus of claim 1 , wherein the coating source includes a coating body and the finishing and coating apparatus includes an electron gun claim 1 , the electron gun configured to bombard the coating body to transform a portion of the coating body to a vapor phase to coat the one or more optical components.3. The finishing and coating apparatus of claim 1 , wherein the coating source includes a sputtering target and the finishing and coating apparatus includes an ion gun claim 1 , the ion gun configured to direct ions at the sputtering target to eject material from the sputtering target to coat the one or more optical components.4. The finishing and coating apparatus of claim 1 , wherein the coating ...

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Номер записи: 4
05-01-2017 дата публикации

ADAPTIVE BOOST CONTROL FOR GATING PICOSECOND PULSED FIBER LASERS

Номер: US20170005451A1
Автор: Kutscha Timothy N., Lowder Tyson
Принадлежит: nLIGHT, Inc.

A method includes applying a boost pump signal to a pump laser of a laser system based on a preceding off duration associated with the laser system, and applying a forward pump signal to the pump laser. A laser system includes a seed laser situated to generate seed optical pulses, a pump laser situated to generate pump optical radiation, a fiber amplifier situated to receive the pump optical radiation and the seed optical pulses, and a controller situated to select a pump boost duration or pump boost magnitude based on an off duration associated with the laser system. 1. A method , comprising:applying a boost pump signal to a pump laser of a laser system based on a preceding off duration associated with the laser system; andapplying a forward pump signal to the pump laser.2. The method of claim 1 , further comprising detecting the off duration.3. The method of claim 1 , wherein the off duration is associated with a laser gate signal claim 1 , and the boost pump signal is applied in response to the laser gate signal.4. The method of claim 1 , wherein the off duration is associated with the pump laser.5. The method of claim 1 , further comprising determining a duration of the boost pump signal based on stored pump signal values associated with a plurality of off durations.6. The method of claim 5 , further comprising:applying the boost pump signal in response to a gate signal;wherein the forward pump signal is applied upon completion of the boost pump signal.7. The method of claim 6 , wherein the boost pump signal is selected based on a laser system output pulse rise time and overshoot.8. The method of claim 1 , further comprising determining a magnitude of the boost pump signal based on stored pump signal magnitudes associated with a plurality of off durations.9. The method of claim 8 , wherein a duration of the boost pump signal is common for at least two off durations.10. The method of claim 1 , further comprising determining a duration of the boost pump signal ...

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Номер записи: 5
20-01-2022 дата публикации

Efficient In-Band Pumping of Holmium-Doped Optical Fiber Amplifiers

Номер: US20220021173A1
Автор: Delavaux Jean-Marc, Tench Robert E.
Принадлежит: Cybel, LLC.

A fiber-based optical amplifier for operation at an eye-safe input signal wavelength λwithin the 2 μm region is formed to include a section of Holmium (Ho)-doped optical gain fiber. The pump source for the fiber amplifier is particularly configured to provide pump light at a wavelength where the absorption coefficient of the Ho-doped optical gain fiber exceeds its gain coefficient (referred to as an “absorption-dominant pump wavelength”), and is typically within the range of 1800-1900 nm. The selection of an absorption-dominant pump wavelength limits the spontaneous emission of the pump from affecting the amount of gain achieved at the higher wavelength end of the operating region. The amount of crosstalk between the signal wavelength and pump wavelength is also reduced (in comparison to using the conventional 1940 nm pump wavelength). 1. An optical amplifier for operation at an eye-safe input signal wavelength λwithin the 2 μm region , comprising:a section of Holmium (Ho)-doped optical gain fiber responsive to an input optical signal for generating gain within the input optical signal as it propagates therealong by the presence of Ho ions, providing as an output an amplified optical signal, the section of Ho-doped optical gain fiber exhibiting a gain coefficient G and an absorption coefficient α that both vary as a function of an applied pump wavelength; and{'sub': P', 'P', 'P, 'a pump source coupled to the section of Ho-doped optical gain fiber and configured to provide pump light at a wavelength λwithin an absorption-dominant wavelength region where α(λ)>G(λ).'}2. An optical amplifier as defined in wherein the absorption-dominant wavelength region extends from about 1800 nm to about 1900 nm.3. An optical amplifier as defined in wherein the absorption-dominant pump wavelength λcomprises a value in the range of about 1820 nm to about 1880 nm.4. An optical fiber amplifier as defined in wherein the section of Ho-doped optical gain fiber comprises a section of single- ...

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Номер записи: 6
08-01-2015 дата публикации

PULSED FIBER LASER WITH DOUBLE- PASS PUMPING

Номер: US20150010025A1
Автор: Cannone Fabio, Nolli Daniela, Tagliaferri Marco
Принадлежит:

A pulsed fiber laser oscillator comprising in succession: a pumping source () for providing pumping energy at a first wavelength to a multimode optical fiber; a first Bragg grating optical filter () reflecting a second wavelength and transparent to said first wavelength; an active optical fiber () having a predefined wavelength which emits radiation at said second wavelength; a switch () arranged to periodically interrupt said second wavelength to provide a pulsed laser beam; and a second Bragg grating optical filter () partially reflecting said second wavelength; characterized by comprising, following said active optical fiber (), a reflector () of said first wavelength, such that said pumping energy undergoes two passages within said active optical fiber (); said predefined wavelength being determined such that the absorption of said pumping energy at said first wavelength within said active optical fiber () is greater than 80% after undergoing said two passages. 1101120141520212020. A pulsed fiber laser oscillator comprising in succession: a pumping source () for providing pumping energy at a first wavelength to a muitimode optical fiber; a first Bragg grating optical filter () reflecting a second wavelength and transparent to said first wavelength; an active optical fiber () having a predefined wavelength which emits radiation at said second wavelength; a switch () arranged to periodically interrupt said second wavelength to provide a pulsed laser beam; and a second Bragg grating optical filter () partially reflecting said second wavelength; characterized by comprising , following said active optical fiber () , a reflector () of said first wavelength , such that said pumping energy undergoes two passages within said active optical fiber (); said predefined wavelength being determined such that the absorption of said pumping energy at said first wavelength within said active optical fiber () is greater than 80% after undergoing said two passages.2144041. A laser ...

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Номер записи: 7
12-01-2017 дата публикации

LASER LIGHT-SOURCE APPARATUS AND LASER PULSE LIGHT GENERATING METHOD

Номер: US20170012402A1
Автор: OKADA Joji, ORII Yosuke
Принадлежит: SPECTRONIX CORPORATION

A laser light-source apparatus includes: fiber amplifiers and a solid state amplifier configured to amplify pulse light output from a seed light source based on gain switching; nonlinear optical elements configured to perform wavelength conversion on the pulse light output from the solid state amplifier; an optical switching element configured to permit or stop propagation of pulse light from the fiber amplifier to the solid state amplifier; and a control unit configured to control the optical switching element in such a manner that the propagation of the light is stopped in an output period of the pulse light from the seed light source, and permitted in a period other than the output period of the pulse light from the seed light source. 19.-. (canceled)10. A laser light-source apparatus comprising:a seed light source configured to output pulse light based on gain switching;a fiber amplifier configured to amplify the pulse light output from the seed light source;a solid state amplifier configured to amplify the pulse light output from the fiber amplifier;a nonlinear optical element configured to perform wavelength conversion on the pulse light output from the solid state amplifier and output the resultant pulse light;an optical switching element that is disposed between the fiber amplifier and the solid state amplifier, and is configured to permit or stop propagation of light from the fiber amplifier to the solid state amplifier; anda control unit configured to control the optical switching element in such a manner that the propagation of the light is stopped in an output period of the pulse light from the seed light source, and permitted in a period other than the output period of the pulse light from the seed light source to achieve an output stopped state in which the output of the pulse light from the nonlinear optical element is stopped.11. The laser light-source apparatus according to claim 10 , wherein the control unit is configured to periodically or ...

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Номер записи: 8
14-01-2016 дата публикации

Method of determining decrease of optical output power in optical amplifier apparatus and optical amplifier system

Номер: US20160013612A1
Автор: Noriaki Shimada
Принадлежит: Fujikura Ltd

A current I i supplied to a pumping light source 20 is detected and time-averaged with a predetermined time constant to calculate a time-averaged current I av . An optical output power P i outputted from an amplifying optical fiber 12 is detected and time-averaged with the predetermined time constant to calculate a time-averaged optical output power P av . A reference optical output power P r and a reference current I r supplied to the pumping light source 20 when the reference optical output power P r is outputted from an optical fiber laser apparatus 1 are used to calculate an optical output power expectation value P ex =I av ×P r /I r . The time-averaged optical output power P av and the optical output power expectation value P ex are compared with each other to determine a decrease of an optical output power of the optical amplifier apparatus 1 based on the comparison result.

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Номер записи: 9
19-01-2017 дата публикации

OPTICAL PARAMETRIC OSCILLATION LASER BASED ON I-TYPE QUASI-PHASE MATCHING

Номер: US20170018904A1
Автор: FAN Dianyuan, LI Ying, WEN Shuangchun, ZHANG Lifu, ZHONG Haizhe
Принадлежит:

Provided is an optical parametric oscillation laser based on I-type quasi-phase matching. The optical parametric oscillation laser comprises a femtosecond laser pumping source (), an input coupling mirror (), an Mg:PPLN crystal (), an output coupling mirror () and a beam splitter prism (), wherein the femtosecond laser pumping source () of a synchronous pump, the input coupling mirror (), the Mg:PPLN crystal (), the output coupling mirror () and the beam splitter prism () are sequentially placed. Group velocity mismatching between near-infrared pump light and intermediate infrared signal light in the intermediate infrared optical parametric oscillation laser is eliminated by using the dispersion relationship between the crystal and the temperature and in a manner of adjusting the working temperature of the crystal, so that an optical parametric oscillation process can satisfy phase matching and group velocity matching at the same time, and therefore intermediate infrared ultrashort pulse laser with high power and wide spectrum is obtained. 1. An optical parametric oscillation laser based on I-type quasi-phase matching , wherein , it comprises:a femtosecond pulse laser serving as a pump source;an input coupling mirror;an MgO:PPLN crystal;an output coupling mirror; and,a beam splitter prism;wherein, the femtosecond pulse laser serving as a pump source, the input coupling mirror, the MgO:PPLN crystal, the output coupling mirror and the beam splitter prism are placed sequentially;a laser pulse emitted from the femtosecond pulse laser serving as a pump source, enters the MgO:PPLN crystal through the input coupling mirror, and forms optical parametric oscillation between the input coupling mirror and the output coupling mirror; a mixed light is then emitted from the output coupling mirror, which is further isolated by the beam splitter prism, and a mid-infrared ultrashort pulse laser is finally obtained.2. The optical parametric oscillation laser based on I-type quasi- ...

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Номер записи: 10
18-01-2018 дата публикации

TRANSIENT BRAGG GRATINGS IN OPTICAL WAVEGUIDES AND THEIR APPLICATIONS

Номер: US20180019564A1
Автор: Ishaaya Amiel, SIVAN Yonatan
Принадлежит:

A method for obtaining transient Bragg gratings in optical waveguides and several different applications of the transient Bragg gratings obtained using this method are presented. The basic mechanisms for obtaining the transient gratings in the waveguides are refractive index change due to Kerr nonlinearity, free carrier generation, and gratings formed by linear or non-linear absorption of thermal energy. The exemplary applications include an ultra-fast fiber laser source at any central wavelength, a fast spectral switch/modulator, transient pulse stretchers based on transient chirped gratings, Q-switching based on transient gratings, and time reversal of ultra-short pulses and low power sub-nanosecond pulse generations. 1. An optical setup for forming a transient Bragg grating in an optical waveguide , the optical setup comprising:a) an ultra-fast laser configured to emits high intensity ultra-fast pulses;b) a cylindrical lens configured to form radiation emitted by the laser into a line that is focused on the optical waveguide; andc) a phase mask located between the aperture and the optical waveguide;wherein, diffraction patterns created by the phase mask for each pulse interfere to create refractive index changes at high intensity points along the waveguide at a spatial period determined by the phase mask, the wavelength, and the specific material of the waveguide, such that said refractive index changes are reversed when the radiation ceases to be focused on the waveguide, thereby forming a transient Bragg grating.2. The optical setup of comprising an aperture located between the cylindrical lens and the phase mask.3. The optical setup of claim 1 , wherein the laser peak power is one of the following:lower than that required for permanent grating inscription; andhigher than the saturation level of the fiber if the fiber has been pretreated using high peak power illumination so that its permanent index change is saturated.4. The optical setup of wherein the ...

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Номер записи: 11
17-01-2019 дата публикации

LASER-DRIVEN LIGHT SOURCE DEVICE

Номер: US20190021158A1
Автор: NOZAKI Shinichiro
Принадлежит: USHIO DENKI KABUSHIKI KAISHA

A laser-driven light source device includes a laser oscillation unit configured to emit laser light, and a plasma vessel configured to contain and seal a discharge medium therein. The laser-driven light source device also includes an optical system configured to condense the laser light emitted from the laser oscillation unit, and direct the laser light to an inside of the plasma vessel to generate a plasma. The laser oscillation unit includes a control unit configured to perform an on/off control on the generation of the laser light to modulate an output of the laser light such that the laser light is generated during an on-time of several μsec to several msec and the laser light is not generated during an off-time. The off-time is decided such that the plasma in the plasma vessel does not disappear. 1. A laser-driven light source device comprising:a laser oscillation unit configured to emit laser light;a plasma vessel configured to contain and seal a discharge medium therein; and,an optical system configured to condense the laser light emitted from the laser oscillation unit, and direct the laser light to an inside of the plasma vessel to generate a plasma,the laser oscillation unit including a control unit configured to perform an on/off control on generation of the laser light to modulate an output of the laser light such that the laser light is generated during an on-time of several μsec to several msec and the laser light is not generated during an off-time, the off-time being decided to avoid disappearing of the plasma in the plasma vessel.2. The laser-driven light source device according to claim 1 , wherein the laser oscillation unit includes:a laser resonator that contains a laser medium therein;a pumping device configured to excite the laser medium; andan electricity feeding device configured to feed a power to the pumping device, andthe control unit is configured to perform the on/off control on the electricity feeding device such that the on-time ...

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Номер записи: 12
23-01-2020 дата публикации

SYSTEM AND METHOD FOR PLASMONIC CONTROL OF SHORT PULSES IN OPTICAL FIBERS

Номер: US20200028315A1
Автор: ALLEN Graham S., Dawson Jay W., FEIGENBAUM Eyal, NOGINOV Mikhail A.
Принадлежит:

The present disclosure relates to an optical waveguide system. The system may include a first waveguide having a core-guide and a material portion surrounding and encasing the core-guide. The core-guide enables a core-guide mode for an optical signal travelling through the core-guide. A second waveguide forms a lossy waveguide on an outer surface of the first waveguide. The construction of the second waveguide is such as to achieve a desired coupling between the core-guide mode and the lossy waveguide to control an energy level of the optical signal travelling through the core-guide. 1. An optical waveguide system including:a first waveguide having a core-guide and a material portion surrounding and encasing the core-guide, the core-guide enabling a core-guide mode for an optical signal travelling through the core-guide;a second waveguide forming a lossy waveguide on an outer surface of the first waveguide;the construction of the second waveguide being such as to achieve a desired coupling between the core-guide mode and the lossy waveguide to control an energy level of the optical signal travelling through the core-guide; andan optical pump source configured to inject optical energy into the first waveguide from an angle non-parallel to the core-guide, using the coupling between the core-guide mode and the lossy waveguide.2. The system of claim 1 , wherein the second waveguide comprises metal which forms a plasmonic device claim 1 , and which implements a plasmonic mode waveguide.3. The system of claim 2 , wherein the cladding material portion surrounding the core-guide includes a flat surface portion claim 2 , and the plasmonic device is disposed on the flat surface portion.4. The system of claim 3 , wherein the first wave-guide has a D-shaped construction when viewed in cross section.5. The system of claim 2 , wherein a plurality of plasmonic devices are disposed along a length of the optical fiber.6. The system of claim 2 , wherein the plasmonic device comprises ...

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Номер записи: 13
17-02-2022 дата публикации

WAVELENGTH BEAM COMBINING LASER SYSTEMS WITH HIGH BEAM QUALITY FACTOR

Номер: US20220050302A1
Автор: Chann Bien, Cruz Michael, Huang Robin, Tayebati Parviz, ZHOU Wang-Long
Принадлежит:

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. 18.-. (canceled)9. A method for forming an output laser beam , the method comprising:propagating an input beam toward a dispersive element;intercepting and redirecting one or more first portions of the input beam upstream of the dispersive element while allowing a second portion of the input beam to propagate to the dispersive element without being intercepted and redirected;causing the one or more first portions of the input beam to at least partially overlap with the second portion of the input beam at the dispersive element, whereby a dispersed beam is formed; andtransmitting a first portion of the dispersed beam as an output beam.10. The method of claim 9 , further comprising forming an external lasing cavity with a second portion of the dispersed beam.11. The method of claim 10 , wherein forming the external lasing cavity comprises reflecting the second portion of the dispersed beam back to the dispersive element and thence to a beam source.12. The method of claim 9 , further comprising forming the input beam by:emitting a plurality of beams from a beam source; andfocusing the beams to form the input beam.13. The method of claim 12 , wherein the beam source comprises one or more beam emitters.14. The method of claim 9 , wherein intercepting and redirecting one or more first portions of the input beam comprises intercepting and redirecting a plurality of first portions of the input beam.15. The method of claim 14 , wherein each first portion of the input beam comprises approximately one-third of the input beam.16. The method of claim 9 , wherein the second portion of the input beam comprises approximately one-third of the input beam.17. The method of claim 9 , wherein each first portion of the input beam is ...

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Номер записи: 14
06-02-2020 дата публикации

Laser System For Skin Treatment

Номер: US20200038677A1
Автор: Bhawalkar Jayant, Hsia James, Jones Christopher J., Qiu Jinze, Shang Xiaoming
Принадлежит:

A method of treating pigmented lesions and vascular lesions by a wavelength between 500 nm and 600 nm applied to the segment of skin as a train of pulses. In some examples, a wavelength of 1048 nm is applied sequentially or simultaneously with the wavelength between 500 nm and 600 nm. Disclosed is also an apparatus supporting such skin treatment. 1. An apparatus to generate a train of sub-pulses comprising:a flash-lamp pumped free-running alexandrite laser configured to generate a sequence of laser light macro pulses with each macro pulse having a duration of 0.1 to 100 msec;an Neodymium doped laser medium (Nd:YLF) pumped by the free running alexandrite laser;a passive Q-switch configured to generate a train of laser light sub-pulses within an envelope of 0.1 ms to 100 ms;a beam shaping optical system;a second harmonic generator and a lens to focus laser light generated by the neodymium doped laser medium into a fiber for delivery to a segment of skin; andwherein the alexandrite laser is configured to generate the sequence of laser macro pulses with each laser macro pulse having a duration of 0.1 to 100 ms.2. The apparatus according to claim 1 , wherein the neodymium-doped laser medium is a Nd:YLF rod.3. The apparatus according to claim 1 , wherein the passive Q-switch is a Cr. 4+:YAG crystal.4. The apparatus according to claim 1 , wherein the second harmonic generator is a Lithium Triborate (LiBOor LBO) nonlinear optical crystal.5. The apparatus according to claim 1 , wherein the second harmonic generator is a non-critically phase matched Lithium Triborate (LiBOor LBO) nonlinear optical crystal and wherein a non-critically phase matched second harmonic generator supports low sensitivity to angular misalignment.6. The apparatus according claim 1 , wherein the second harmonic generator is a potassium titanyl phosphate (KTP) nonlinear optical crystal.7. The apparatus according to claim 1 , wherein the second harmonic generator produces a laser light with wavelength of ...

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Номер записи: 15
08-02-2018 дата публикации

GaN PUMPED RUBY LASER

Номер: US20180041002A1
Автор: William F. Krupke
Принадлежит: Wfk Lasers LLC

A diode pumped solid state laser is provided which includes a ruby crystal optical gain medium and a high bandgap semiconductor laser diode (LD) or light emitting diode (LED) pump source to directly optically pump the gain medium. The high-bandgap semiconductor LD or LED is a semiconductor device whose chemical composition is chosen to provide output radiation at an approximate wavelength of ˜405 nm. The ruby crystal produces laser output at the relatively short wavelength of ˜694 nm.

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Номер записи: 16
14-02-2019 дата публикации

SUPERCONTINUUM LIGHT SOURCE COMPRISING TAPERED MICROSTRUCTURED OPTICAL FIBER

Номер: US20190049662A1
Автор: ALKESKJOLD Thomas T., Thomsen Carsten l., Thomsen Erik B.
Принадлежит: NKT Photonics A/S

The invention relates to a supercontinuum light source comprising a microstructured optical fiber and a pump light source. The microstructured optical fiber comprises a core and a cladding region surrounding the core, as well as a first fiber length section, a second fiber length section and an intermediate fiber length section between said first and second fiber length sections. The first fiber length section comprises a core with a first characteristic core diameter. The second fiber length section comprises a core with a second characteristic core diameter, smaller than said first characteristic core diameter, where said second characteristic core diameter is substantially constant along said second fiber length section. The intermediate length section of the optical fiber comprises a core which is tapered from said first characteristic core diameter to said second characteristic core diameter over a tapered length. 128-. (canceled)29. A microstructured optical fiber for generating supercontinuum light upon feeding of light having a first wavelength λ , the optical fiber having a length and a longitudinal axis along its length and comprising a core region for guiding light along the length of said optical fiber , and a first cladding region surrounding said core region , wherein:said optical fiber, along its length, comprises a first fiber length section, a second fiber length section, and an intermediate fiber length section between said first and second fiber length sections;{'sub': '1', 'said first fiber length section has a core region with a first characteristic core diameter Win a cross-section through the microstructured optical fiber perpendicularly to the longitudinal axis;'}{'sub': 2', '2', '1, 'said second fiber length section has a core region with a second characteristic core diameter Win a cross-section through the microstructured optical fiber perpendicularly to the longitudinal axis, where said second characteristic core diameter Wis smaller than ...

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Номер записи: 17
25-02-2021 дата публикации

SYSTEM AND METHOD FOR PLASMONIC CONTROL OF SHORT PULSES IN OPTICAL FIBERS

Номер: US20210057870A1
Автор: ALLEN Graham S., Dawson Jay W., FEIGENBAUM Eyal, NOGINOV Mikhail A.
Принадлежит:

The present disclosure relates to an optical waveguide system. The system has a first waveguide having a core-guide and a cladding material portion surrounding and encasing the core-guide to form a substantially D-shaped cross sectional profile with an exposed flat section running along a length thereof. The core-guide enables a core-guide mode for an optical pulse signal having a first characteristic, travelling through the core-guide. A material layer of non-linear material is used which forms a second waveguide. The material layer is disposed on the exposed flat section of the cladding material portion. The material layer forms a plasmonic device to achieve a desired coupling with the core-guide to couple optical energy travelling through the core-guide into the material layer to modify the optical energy travelling through the core-guide such that the optical energy travelling through the core-guide has a second characteristic different from the first characteristic. 1. An optical waveguide system including:a first waveguide having a core-guide and a cladding material portion surrounding and encasing the core-guide to form a substantially D-shaped cross sectional profile with an exposed flat section running along a length thereof, the core-guide enabling a core-guide mode for an optical pulse signal having a first characteristic, travelling through the core-guide; anda material layer of non-linear material forming a second waveguide, the material layer being disposed on the exposed flat section of the cladding material portion, the material layer forming a plasmonic device to achieve a desired coupling with the core-guide to couple optical energy travelling through the core-guide into the material layer, which modifies the optical energy travelling through the core-guide to cause the optical energy travelling through the core-guide to have a second characteristic different from the first characteristic.2. The system of claim 1 , wherein the first predetermined ...

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Номер записи: 18
23-02-2017 дата публикации

LASER LIGHT-SOURCE APPARATUS AND LASER PULSE LIGHT GENERATING METHOD

Номер: US20170054268A1
Автор: OKADA Joji, ORII Yosuke
Принадлежит: SPECTRONIX CORPORATION

A laser light-source apparatus includes; a seed light source; a fiber amplifier configured to amplify pulse light output from the seed light source based on gain switching; a solid state amplifier configured to further amplify the resultant pulse light; a nonlinear optical element configured to perform wavelength conversion on the pulse light output from the solid state amplifier; an optical switching element that is disposed between the fiber amplifier and the solid state amplifier and is configured to remove ASE noise; and a control unit. The control unit is configured to control the optical switching element in such a manner that propagation of light is permitted in an output period of the pulse light from the seed light source, and is stopped in a period other than the output period. 1. A laser light-source apparatus comprising:a seed light source configured to output pulse light based on gain switching;a fiber amplifier configured to amplify the pulse light output from the seed light source;a solid state amplifier configured to amplify the pulse light output from the fiber amplifier;a nonlinear optical element configured to perform wavelength conversion on the pulse light output from the solid state amplifier and output the resultant pulse light:an optical switching element that is disposed between the fiber amplifier and the solid state amplifier, and is configured to permit or stop propagation of light from the fiber amplifier to the solid state amplifier; anda control unit configured to execute:gain switching control processing in which the seed light source is driven at a predetermined cycle;excitation control processing in which an excitation light source of the fiber amplifier and/or the solid state amplifier is periodically or intermittently controlled in such a manner that the fiber amplifier and/or the solid state amplifier enters a population inversion state before receiving the pulse light output from the seed light source; andoptical switch control ...

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Номер записи: 19
13-02-2020 дата публикации

LASER LIGHT-SOURCE APPARATUS AND LASER PULSE LIGHT GENERATING METHOD

Номер: US20200052458A1
Автор: OKADA Joji, ORII Yosuke
Принадлежит: SPECTRONIX CORPORATION

A laser light-source apparatus includes a seed light source , fiber amplifiers and and a solid state amplifier configured to amplify pulse light output from the seed light source, nonlinear optical elements and configured to perform wavelength conversion on the pulse light output from the solid state amplifier and output the resultant pulse light, a semiconductor optical amplifier disposed between the seed light source and the solid state amplifier and configured to amplify the pulse light output from the seed light source , and a control unit configured to execute gain switching control processing in which the seed light source is driven at a desired pulse rate, and semiconductor optical amplifier control processing in which an injection current to the semiconductor optical amplifier is controlled depending on the pulse rate of the seed light source , and thus, generation of a giant pulse can be reliably prevented, regardless of the pulse rate of the seed light source. 115-. (canceled)16. A laser light-source apparatus comprising:a seed light source configured to output pulse light based on gain switching;a fiber amplifier configured to amplify the pulse light output from the seed light source;a solid state amplifier configured to amplify the pulse light output from the fiber amplifier;a nonlinear optical element configured to perform wavelength conversion on the pulse light output from the solid state amplifier and output the resultant pulse light;a semiconductor optical amplifier disposed between the seed light source and the solid state amplifier and configured to amplify the pulse light output from the seed light source; anda control unit configured to execute gain switching control processing in which the seed light source is driven at a desired pulse rate, and semiconductor optical amplifier control processing in which an injection current to the semiconductor optical amplifier is controlled depending on the pulse rate of the seed light source.17. The laser ...

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Номер записи: 20
20-02-2020 дата публикации

Multiple Beam Pulsed Laser Deposition of Composite Films

Номер: US20200055140A1
Автор: Darwish Abdalla, Sarkisov Sergey
Принадлежит:

The present disclosure generally relates to a system and method for multiple beam laser deposition of thin films wherein separate laser beams are used to ablate material from separate targets for concurrent deposition on a common substrate. The targets may include, but not limited to polymers, organics, inorganics, nanocrystals, solutions, or mixtures of materials. A target may be disposed on a tiltable mount to adjust the direction of the ablation plumes. Multiple ablation modes may be concurrently employed at the various targets, including, but not limited to pulsed laser, MAPLE, IR-MAPLE and other modes. The system may include a camera and processor for plume axis determination and feedback control of the plume axis by controlling a tilt of a target holder. Maple target loading sequences and liquid states are described. Fluorescent image monitoring is described. 1. A method for adjusting a target direction during pulsed laser vacuum deposition of a thin film , said method comprising:providing a vacuum chamber for housing a substrate for receiving said deposition of said thin film;providing a first target holder within said vacuum chamber for holding a target, said first target holder having a tilt control;filling said first target holder with target material in a liquid state, said liquid target material comprising a solvent and a polymer; said vacuum chamber containing ambient air;closing said vacuum chamber and purging said ambient air after said filling said first target with said target material in said liquid state;cooling said target material after said purging said ambient air, said cooling sufficient to freeze said target material to a solid state to produce a solid target;directing at least one laser at said solid target;directing a camera system to view a plume produced from said solid target by said laser;directing an illumination source to illuminate said plume produced from said solid target;a processor receiving image data from said camera system; ...

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Номер записи: 21
21-02-2019 дата публикации

SPECTROSCOPY SYSTEM WITH LASER AND PULSED OUTPUT BEAM

Номер: US20190056266A1
Автор: Islam Mohammed N.
Принадлежит:

A spectroscopy system includes a light source having an input light source, including semiconductor diodes generating an input beam with a wavelength shorter than 2.5 microns. Cladding-pumped fiber amplifiers receive the input beam and form an amplified optical beam having a spectral width. A nonlinear element broadens the spectral width of the amplified optical beam to 100 nm or more through a nonlinear effect forming an output beam that is pulsed. A filter is coupled to at least one of a lens and a mirror that receives the output beam and delivers the filtered output beam to a sample. A detection system includes detectors configured to receive the output beam reflected or transmitted from the sample. The detection system is configured to use a lock-in technique with the pulsed output beam and the spectroscopy system is adapted to detect chemicals in the sample. 1. A spectroscopy system , comprising: an input light source, including one or more semiconductor diodes, configured to generate an input beam that comprises a wavelength shorter than 2.5 microns;', 'one or more optical amplifiers configured to receive at least a portion of the input beam and to form an amplified optical beam having a spectral width, wherein at least a portion of the one or more optical amplifiers comprises a cladding-pumped fiber amplifier; and', 'a nonlinear element configured to receive at least a portion of the amplified optical beam and to broaden the spectral width of the received amplified optical beam to 100 nm or more through a nonlinear effect forming an output beam, wherein the output beam is pulsed;, 'a light source comprisinga filter coupled to at least one of a lens and a mirror configured to receive at least a portion of the output beam, and to deliver at least a portion of the received output beam to a sample; anda detection system comprising one or more detectors configured to receive at least a part of the output beam reflected or transmitted from the sample, wherein the ...

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Номер записи: 22
17-03-2022 дата публикации

780 nm ULTRASHORT-PULSED FIBER LASER

Номер: US20220085566A1
Автор: CAIRNS Lee, LEONHARDT Volker, Reilly Sean
Принадлежит: Coherent Scotland Limited

An erbium fiber laser produces a beam of ultrashort laser pulses having a center wavelength greater than 780 nanometers, an average power greater than 0.5 watt, and a spectral bandwidth compressible to a pulse duration of less than 200 femtoseconds. The laser includes a fiber preamplifier that is energized by a counter-propagating pump beam, has relatively low population inversion in a relatively long optical gain fiber, and provides a spectrally-shaped beam for further amplification. Wavelength dependent gain and absorption within the optical gain fiber enhances longer wavelengths relative to shorter wavelengths in the spectrally-shaped beam. The spectral shaping is sufficient to overcome gain narrowing and gain shifting in a subsequent high-gain fiber amplifier. 1. A fiber laser , comprising:a seed laser generating a pulsed fundamental beam having a center wavelength;an optical gain fiber arranged to receive the fundamental beam, the fundamental beam propagating through the optical gain fiber from a first end to a second end thereof, the optical gain fiber having a core doped with erbium ions that are energized by a pump beam, the fundamental beam and the pump beam counter-propagating within the optical gain fiber, the pump beam having a power selected to produce population inversion at the second end of the optical gain fiber in a range between 30% and 60%, the optical gain fiber having a length selected to absorb all the power of the pump beam, the center wavelength of the fundamental beam increasing between the first end and the second end of the optical gain fiber;a power amplifier arranged to receive the fundamental beam from the optical gain fiber and to generate an amplified fundamental beam, the amplified fundamental beam having a spectral bandwidth that is compressible to a pulse duration less than or equal to 240 femtoseconds; anda harmonic generator arranged to receive the amplified fundamental beam and to generate a second-harmonic beam having a center ...

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Номер записи: 23
28-02-2019 дата публикации

Discriminative Remote Sensing And Surface Profiling Based On Superradiant Photonic Backscattering

Номер: US20190067896A1
Автор: Yuping Huang
Принадлежит: Stevens Institute of Technology

Disclosed is a system and method for remote sensing, surface profiling, object identification, and aiming based on two-photon population inversion and subsequent photon backscattering enhanced by superradiance using two co-propagating pump waves. The present disclosure enables efficient and highly-directional photon backscattering by generating the pump waves in properly pulsed time-frequency modes, proper spatial modes, with proper group-velocity difference in air. The pump waves are relatively delayed in a tunable pulse delay device and launched to free space along a desirable direction using a laser-pointing device. When the pump waves overlap in air, signal photons will be created through two-photon driven superrdiant backscattering if target gas molecules are present. The backscattered signal photons propagate back, picked using optical filters, and detected. By scanning the relative delay and the launching direction while the signal photons are detected, three-dimensional information of target objects is acquired remotely.

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Номер записи: 24
16-03-2017 дата публикации

RECOVERING A RARE-EARTH-DOPED OPTICAL FIBER UNDER IRRADIATION

Номер: US20170077668A1
Автор: CHANG SHENG HSIUNG, CHEN Chii-Chang, Liu Ren-Young, TAI Chao-Yi
Принадлежит:

An optical fiber apparatus and a method of recovering radiation-induced-attenuation (RIA) onto a rare-earth-doped optical fiber under irradiation are provided in this disclosure. A light source is coupled to a rare-earth doped optical fiber. The light source emits a combination of mode locked pulsed light and non-mode locked quasi-continuous-wave light. The mode locked pulsed light are used to recover RIA onto the rare-earth doped optical fiber in real time, and the non-mode locked light are used to pump the rare-earth doped optical fiber as a gain medium. Each pulsed duration of the mode locked pulsed light is much shorter than operation duration of the non-mode locked light, such that an instantaneous power of the mode locked pulsed light exceeds a saturated pumping power required for the rare-earth doped optical fiber, so as to effectively elevate the core temperature of rare-earth doped fiber to achieve a confined photo-annealed recovery of RIA onto rare-earth doped fibers. 1. An optical fiber apparatus , comprising:an optical fiber assembly comprising at least a rare-earth doped optical fiber; anda light source, coupled to the optical fiber assembly, for emitting a combination of mode locked pulsed light and non-mode locked quasi-continuous-wave light, wherein the mode locked pulsed light are used to recover radiation-induced-attenuation (RIA) onto the rare-earth doped optical fiber in real time, the non-mode locked light are used to pump the rare-earth doped optical fiber, and pulsed durations of the mode locked pulsed light are shorter than operation durations of the non-mode locked quasi-continuous-wave light.2. The optical fiber apparatus of claim 1 , wherein the light source is a laser or a broadband light source.3. The optical fiber apparatus of claim 1 , wherein a wavelength of the mode locked pulsed light and the non-mode locked quasi-continuous-wave light is 550-1200 nm.4. The optical fiber apparatus of claim 1 , wherein the light source is an optical ...

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Номер записи: 25
16-03-2017 дата публикации

INEXPENSIVE VARIABLE REP-RATE SOURCE FOR HIGH-ENERGY, ULTRAFAST LASERS

Номер: US20170077669A1
Автор: HARTER Donald J.
Принадлежит: IMRA AMERICA, INC.

System for converting relatively long pulses from rep-rate variable ultrafast optical sources to shorter, high-energy pulses suitable for sources in high-energy ultrafast lasers. Fibers with positive group velocity dispersion (GVD) and self phase modulation are advantageously employed with the optical sources. These systems take advantage of the need for higher pulse energies at lower repetition rates so that such sources can be cost effective. 1. A system comprising:a pulse source outputting pulses which are less than or equal to approximately 10 ns at a variable repetition rate in a range from about 1 kHz to less than about 10 MHz, said pulse source comprising:a light source; anda fiber amplifier with positive group-velocity dispersion (GVD) at an emission wavelength of said light source, said fiber amplifier receiving an output of said light source, and causing spectral generation by self-phase modulation in said fiber amplifier,wherein said fiber amplifier is one of a multimode fiber or a holey fiber,wherein said positive GVD has a negative value of dispersion when expressed in units of ps/nm/km, andwherein said light source comprises a q-switched microchip laser outputting pulses having a pulse energy equal to or greater than 500 nJ.2. The system as claimed in claim 1 , wherein said microchip laser outputs pulses greater than 1 ps.3. The system as claimed in claim 1 , wherein said microchip laser outputs pulses in a range from about 50 ps to about 10 ns.4. The system as claimed in claim 1 , wherein said fiber is a multimode fiber operably arranged for single mode operation and to generate self-phase modulation claim 1 , wherein said fiber comprises a coreless end cap claim 1 , wherein a mode is expanded before a surface of said fiber.5. The system as claimed in claim 1 , wherein pulse energies are greater than 1 μJ and said pulses are stretched at an output of the fiber amplifier.6. The system as claimed in claim 1 , further comprising: a pulse compressor ...

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Номер записи: 26
31-03-2022 дата публикации

ACOUSTIC MODULATED LASERS

Номер: US20220099573A1
Автор: Chen Qiushu, Chen Yu-Cheng, Fan Xudong, LI Xuzhou, Qin Yu, TAN XIAOTIAN, WANG Xueding
Принадлежит: THE REGENTS OF THE UNIVERSITY OF MICHIGAN

A laser whose emission is modulated by ultrasound is presented. The laser is usually micron-sized. In response to ultra-sound modulation, the laser emission increases and decreases. Such a change in emission can be detected by external optical detectors. This type of laser can be used as a new type of imaging modality, in which laser emission in combination with sound waves or ultra-sound waves, is used for imaging Laser emission has a much narrower spectral linewidth and stronger intensity than fluorescence and therefore is able to achieve higher sensitivity, whereas sound waves are used to provide a better spatial resolution of the laser emission from the laser. In ultrasound modulated laser based imaging, multiple lasers can be placed inside cells or tissues. 1. An imaging system , comprising:a laser that outputs a laser beam, wherein largest dimension of the laser is less than a millimeter;a modulating source that generates acoustic radiation and is configured to modulate the laser beam with the acoustic radiation;an optical detector configured to detect the modulated laser beam from the laser; anda controller interfaced with the modulating source and the optical detector.2. The imaging system of wherein the laser is one of a microsphere laser claim 1 , a ring resonator laser claim 1 , a distributed feedback laser claim 1 , a nanowire laser claim 1 , a plasmonic laser or a photonic crystal laser.3. The imaging system of wherein the laser is embedded into at least one of a cell claim 1 , tissue or blood vessel of a subject.4. The imaging system of wherein the modulating source is configured to modulate amplitude of the laser beam.5. The imaging system of wherein the modulating source is configured to focus the acoustic radiation and to report position of the focused acoustic radiation to the controller.6. The imaging system of wherein the acoustic radiation is further defined as ultrasound radiation.7. The imaging system of wherein the optical detector is further ...

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Номер записи: 27
24-03-2016 дата публикации

Operating a laser diode in an optical network

Номер: US20160087393A1
Автор: Guido Gentner, Lutz Rapp
Принадлежит: Xieon Networks SARL

A method and a device is provided driving an optical laser diode ( 710, 711 ) during operation in an optical communication network, by determining a laser transfer function ( 741, 742 ) during operation of the laser diode ( 710, 711 ) and providing a control signal ( 750, 749 ) for driving the laser diode ( 710, 711 ) according to the laser transfer function ( 741, 742 ). Further, a method for driving a first and a second optical laser diode during operation in an optical communication network is provided. Furthermore, an optical amplifier and a communication system is suggested.

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Номер записи: 28
23-03-2017 дата публикации

Supercontinuum Light Source Comprising Tapered Microstructured Optical Fiber

Номер: US20170085051A1
Автор: ALKESKJOLD Thomas T., Thomsen Carsten l., Thomsen Erik B.
Принадлежит: NKT Photonics A/S

The invention relates to a supercontinuum light source comprising a microstructured optical fiber and a pump light source. The microstructured optical fiber comprises a core and a cladding region surrounding the core, as well as a first fiber length section, a second fiber length section and an intermediate fiber length section between said first and second fiber length sections. The first fiber length section comprises a core with a first characteristic core diameter. The second fiber length section comprises a core with a second characteristic core diameter, smaller than said first characteristic core diameter, where said second characteristic core diameter is substantially constant along said second fiber length section. The intermediate length section of the optical fiber comprises a core which is tapered from said first characteristic core diameter to said second characteristic core diameter over a tapered length. 1. A supercontinuum light source comprising:i. a microstructured optical fiber for generating supercontinuum light responsive to being pumped, and{'sub': '1', 'ii. a pump light source arranged to pump said microstructured optical fiber with pump light having a first wavelength, λ;'}wherein:said microstructured optical fiber has a length and a longitudinal axis along its length and comprises a core region that is capable of guiding light along the longitudinal axis of said microstructured optical fiber and a first cladding region surrounding said core region;said microstructured optical fiber comprises a first fiber length section, a second fiber length section as well as an intermediate fiber length section between the first and second fiber length sections;{'sub': 1', '2', '2', '1', '2, 'the core region of said first fiber length section has a first characteristic core diameter W, the core region of said second fiber length section has a second characteristic core diameter W, where said second characteristic core diameter Wis smaller than said first ...

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Номер записи: 29
19-06-2014 дата публикации

Optical amplifier controller

Номер: US20140169787A1
Автор: Brian Shia, Yan Han
Принадлежит: Infinera Corp

A controller is configured to determine a first amount of current associated with a first power level. The controller is configured further to generate a digital pulse signal based on the first amount of current, where the digital pulse signal may have a second power level and an associated duty cycle. The controller is configured further to convert the digital pulse signal into a second amount of current and output the second amount of current as a pulse signal based on the duty cycle.

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Номер записи: 30
25-03-2021 дата публикации

GENERATING SYNCHRONIZED LASER PULSES AT VARIABLE WAVELENGTHS

Номер: US20210091527A1
Автор: Gottschall Thomas, Limpert Jens, Meyer Tobias, Popp Jürgen, Tunnermann Andreas
Принадлежит:

The invention relates to an apparatus for generating laser pulses. It is an object of the invention to provide a method for generating synchronized laser pulse trains at variable wavelengths (e.g., for coherent Raman spectroscopy/microscopy), wherein the switching time for switching between different wavelengths should be in the sub-μs range. For this purpose the apparatus according to the invention comprises 1. An apparatus for generating laser pulses , comprising{'b': '1', 'pump laser (), which emits pulsed laser radiation at a specified wavelength,'}{'b': '3', 'an FDML laser (), which emits continuous wave laser radiation at a cyclically variable wavelength, and'}{'b': 4', '1', '3, 'a nonlinear conversion medium (), in which the pulsed laser radiation of the pump laser () and the continuous wave laser radiation of the FDML laser () are superposed.'}22141. The apparatus as claimed in claim 1 , characterized by an optical amplifier () arranged in the beam path between the pump laser () and the nonlinear conversion medium () claim 1 , which optical amplifier amplifies the laser radiation of the pump laser ().34. The apparatus as claimed in claim 1 , characterized in that the nonlinear conversion medium () is a microstructured optical fiber claim 1 , a fundamental-mode fiber claim 1 , a multimode fiber claim 1 , a periodically polarized birefringent crystal claim 1 , a birefringent crystal claim 1 , a hollow-core fiber filled with nobel gas claim 1 , a kagome fiber filled with nobel gas or a “negative curvature” fiber filled with nobel gas.41. The apparatus as claimed in claim 1 , characterized in that the pump laser () emits laser pulses with a repetition rate in the range of 1 kHz to 1 GHz and a pulse duration in the range of 1 μs to 10 fs.5. A method for generating laser pulses claim 1 , comprising at least the following steps:{'b': '1', 'generating pulsed laser radiation at a specified wavelength with a pump laser (),'}{'b': '3', 'generating continuous wave laser ...

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Номер записи: 31
26-06-2014 дата публикации

PULSE SHAPING DEVICE AND PULSE SHAPING METHOD

Номер: US20140177661A1
Автор: Oka Michio, Tanaka Kenji
Принадлежит: SONY CORPORATION

There is provided a pulse shaping device including a pulse generator configured to generate pulsed light by using a semiconductor laser for emitting light of a predetermined wavelength, and an optical member provided in a subsequent stage of the pulse generator and configured to compress a pulse time width of the pulsed light. The pulsed light has a first frequency dispersion state. The optical member imparts a second frequency dispersion state to the pulsed light, the second frequency dispersion state being a frequency dispersion state opposite to the first frequency dispersion state. 1. A pulse shaping device comprising:a pulse generator configured to generate pulsed light by using a semiconductor laser for emitting light of a predetermined wavelength; andan optical member provided in a subsequent stage of the pulse generator and configured to compress a pulse time width of the pulsed light,wherein the pulsed light has a first frequency dispersion state, andwherein the optical member imparts a second frequency dispersion state to the pulsed light, the second frequency dispersion state being a frequency dispersion state opposite to the first frequency dispersion state.2. The pulse shaping device according to claim 1 ,wherein the pulsed light has a wavelength ranging from 350 nm to 500 nm,wherein the first frequency dispersion state is negative dispersion, andwherein the optical member compresses the pulsed light by imparting positive dispersion as the second frequency dispersion state.3. The pulse shaping device according to claim 2 , wherein the optical member is an optical member made of quartz glass.4. The pulse shaping device according to claim 3 , wherein the optical member is an optical element made of quartz glass.5. The pulse shaping device according to claim 3 , wherein the optical member is a single-mode optical fiber.6. The pulse shaping device according to claim 1 , wherein a degree to which the pulse time width of the pulsed light is compressed is ...

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Номер записи: 32
19-03-2020 дата публикации

FREQUENCY COMB GENERATING DEVICE AND METHOD FOR GENERATING A FREQUENCY COMB

Номер: US20200092006A1
Автор: Hammer Jakob, Roesel Gerhard, Ruengeler Matthias
Принадлежит: Rohde & Schwarz GmbH & Co. KG

A frequency comb generating device is described. The frequency comb generating device comprises a pulsed optical light source, a sequence generator, a light receiving unit and a switching unit. The sequence generator is configured to generate a repeating sequence signal and to forward the repeating sequence signal at least to the switching unit. The pulsed optical light source is configured to generate electromagnetic wave packets and is synchronized with the sequence generator. The light receiving unit is configured to receive the electromagnetic wave packets and to convert the electromagnetic wave packets into an electrical signal. The switching unit is configured to at least one of control the pulsed optical light source, control the light receiving unit, attenuate the electromagnetic wave packets, phase shift the electromagnetic wave packets, attenuate the electrical signal, and phase shift the electrical signal based on the repeating sequence signal. Moreover, methods for generating an optical frequency comb and for generating an electrical frequency comb are described. 1. A frequency comb generating device comprisinga pulsed optical light source, a sequence generator, a light receiving unit and a switching unit;the sequence generator being configured to generate a repeating sequence signal and to forward the repeating sequence signal at least to the switching unit;the pulsed optical light source being configured to generate electromagnetic wave packets, and the pulsed optical light source being synchronized with the sequence generator;the light receiving unit being configured to receive the electromagnetic wave packets, and the light receiving unit being configured to convert the electromagnetic wave packets into an electrical signal; andthe switching unit being configured to at least one of control the pulsed optical light source, control the light receiving unit, attenuate the electromagnetic wave packets, phase shift the electromagnetic wave packets, ...

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Номер записи: 33
12-05-2022 дата публикации

DISTRIBUTED PULSED LIGHT AMPLIFIER BASED ON OPTICAL FIBER PARAMETER AMPLIFICATION, AND AMPLIFICATION AND PERFORMANCE CHARACTERIZATION METHOD

Номер: US20220149584A1
Автор: FU Xuelei, LI Zhengying, XIONG Ben, Zheng Zhou
Принадлежит: Wuhan University of Technology

The present invention discloses a distributed pulsed light amplifier based on optical fiber parameter amplification, comprising a pump pulsed light source, a sensing pulsed light source, a synchronization device, a two-in-one optical coupler, an optical circulator, a parameter amplification optical fiber, a first optical filter, a photoelectric detector and a signal acquisition device. According to the distributed pulsed light amplifier, high-power pulsed light is used as pump light to generate an optical fiber parameter amplification effect near a zero-dispersion wavelength of an optical fiber, thereby amplifying a power of another sensing pulsed light. Meanwhile, due to the fact that effective optical fiber parameter amplification cannot be achieved through low-power light leakage outside a duration interval of the pump pulsed light, leaked light from the sensing pulsed light cannot be amplified, and the effect of amplifying a pulse extinction ratio can be achieved at the same time. 1123456789124556312936557896126. A distributed pulsed light amplifier based on optical fiber parameter amplification , comprising a pump pulsed light source () , a sensing pulsed light source () , a synchronization device () , a two-in-one optical coupler () , an optical circulator () , a parameter amplification optical fiber () , a first optical filter () , a photoelectric detector () and a signal acquisition device () , wherein outputs of the pump pulsed light source () and the sensing pulsed light source () are combined through the two-in-one optical coupler () and then enter a first communication terminal of the optical circulator () , and are output by a second communication terminal of the optical circulator () and then enter the parameter amplification optical fiber (); the synchronization device () is used to ensure that pump pulsed light output by the pump pulsed light source () and sensing pulsed light output by the sensing pulsed light source () are synchronized in pulse ...

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Номер записи: 34
13-04-2017 дата публикации

DEPTH ENHANCED AND FLUORESCENCE LIFETIME STIMULATED FLUORESCENT EMISSION FOR IN-VIVO IMAGING

Номер: US20170102532A1
Автор: Frankel Robert David
Принадлежит:

The specification relates to a microscopy system. The microscopy system includes a first laser emitting a first laser pulse, the first laser pulse being a pump beam; a second laser emitting a second laser pulse, the second laser pulse being a probe beam; time delay components for delaying the probe beam, wherein the time delay components delay the probe beam by 0.3 ps to 5 ns relative to the pump beam; an optical device for combining the pump beam and the delayed probe beam into a combined laser pulse, the combined laser pulse having a reduced focal spot size; a galvanometer scanning system for delivering the combined laser pulse to a focal spot in a focal plane, wherein the reduced focal spot size of the combined laser pulse initiates a stimulated emission of a targeted molecule, the stimulated emission having dipole-like backscatter, and a detector for detecting the dipole-like backscatter. 1. A microscopy system comprising:a first laser emitting a first laser pulse, the first laser pulse being a pump beam;a second laser emitting a second laser pulse, the second laser pulse being a probe beam;a time delay component for delaying the probe beam, wherein the time delay components delay the probe beam by 0.3 ps to 5 ns relative to the pump beam;an optical device for combining the pump beam and the delayed probe beam into a combined laser pulse, the combined laser pulse having a reduced focal spot size;a galvanometer scanning system for delivering the combined laser pulse to a focal spot in a focal plane, wherein the reduced focal spot size of the combined laser pulse initiates a stimulated emission of a targeted molecule, the stimulated emission having dipole-like backscatter, anda detector for detecting the dipole-like backscatter.2. The microscopy system of wherein at least two photons are used for excitation and at least two photons are used for stimulation emission of a targeted molecule.3. The microscopy system of wherein an electronic transition from an excited ...

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Номер записи: 35
08-04-2021 дата публикации

OPTICALLY MONOLITHIC BEAM SHAPER ARRAY WITH COMPACT TILES

Номер: US20210103152A1
Автор: Goodno Gregory D., Long William H., Rothenberg Joshua E.
Принадлежит:

A beam shaper array assembly including a beam source that provides a plurality of beams having a low fill factor profile. The assembly also includes an input beam shaper array having cells positioned adjacent to each other, where each cell includes an input beam shaper that receives one of the plurality beams and is shaped to cause the beam to expand as it propagates away from the input array to be converted from the low fill factor profile to a high fill factor profile. The assembly further includes an output beam shaper array having cells positioned adjacent to each other, where each cell includes an output beam shaper that receives one of the converted beams and is shaped to cause the beam to stop expanding so that the output array provides a plurality of adjacent beams with minimal overlap and a minimal gap between the beams. 1. A beam shaper array assembly comprising:a beam source providing a plurality of beams, said beams having a low fill factor profile;an input beam shaper array including a plurality of input array cells positioned adjacent and in contact with each other in a tiled manner, each input array cell including an input beam shaper that receives one of the plurality of beams and is shaped to cause the beam to expand as it propagates away from the input beam shaper array to be converted from the low fill factor profile to a high fill factor profile and cause the high fill factor profile to taper to a lower value at a perimeter of each beam than is possible for an equivalent fill factor Gaussian beam; andan output beam shaper array including a plurality of output array cells positioned adjacent and in contact with each other in a tiled manner so that each output array cell is matched to an input array cell, each output array cell including an output beam shaper that receives one of the converted beams and is shaped to flatten the wavefront of the converted beam so that the output beam shaper array provides a plurality of adjacent beams with minimal ...

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Номер записи: 36
03-07-2014 дата публикации

Pulsed bias current for gain switched semiconductor lasers for amplified spontaneous emission reduction

Номер: US20140185643A1
Автор: Dennis McCal, Timothy S. McComb
Принадлежит: NLight Photonics Corp

Gain switched laser diode pulses are used as seed pulses for optical pulse generation. ASE is reduced by applying a prebias to the laser diodes at an amplitude less than that associated with a laser diode threshold. An electrical seed pulse having an amplitude larger than that associated with laser threshold is applied within about 10-100 ns of the prebias pulse. The resulting laser diode pulse can be amplified in a pumped, rare earth doped optical fiber, with reduced ASE.

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Номер записи: 37
04-04-2019 дата публикации

LASER SYSTEM

Номер: US20190103724A1
Автор: Onose Takashi, Wakabayashi Osamu
Принадлежит: Gigaphoton Inc.

A laser system includes a laser device configured to output pulse laser light, and a first optical pulse stretcher including a delay optical path for stretching a pulse width of the pulse laser light. The first optical pulse stretcher is configured to change a beam waist position of circulation light that circulates through the delay optical path and is output therefrom, in an optical path axis direction according to a circulation count. When the circulation light is condensed by an ideal lens, a light condensing position of the circulation light is changed in the optical path axis direction according to the circulation count. 1. A laser system comprising:(A) a laser device configured to output pulse laser light; and(B) a first optical pulse stretcher including a delay optical path for stretching a pulse width of the pulse laser light, the first optical pulse stretcher being configured to change a beam waist position of circulation light that circulates through the delay optical path and is output therefrom, in an optical path axis direction according to a circulation count.2. The laser system according to claim 1 , whereinwhen the circulation light is condensed by an ideal lens, a light condensing position of the circulation light is changed in the optical path axis direction according to the circulation count.3. The laser system according to claim 1 , whereinthe delay optical path includes a plurality of concave mirrors, andat least one concave mirror of the plurality of the concave mirrors has a curvature different from curvatures of rest of the concave mirrors.4. The laser system according to claim 1 , whereinthe delay optical path includes a plurality of concave mirrors, andat least one concave mirror of the plurality of the concave mirrors is moved from a position satisfying a collimate condition, in a direction of changing an optical path length of the delay optical path.5. The laser system according to claim 1 , whereinthe delay optical path includes a ...

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Номер записи: 38
20-04-2017 дата публикации

LASER IGNITION DEVICE PROVIDED WITH TRANSMISSIVE REFLECTIVE FILM

Номер: US20170107966A1
Автор: KANEHARA Kenji, SUGIURA Akimitsu, Taira Takunori
Принадлежит:

A laser ignition device capable of achieving stable ignition, preventing deterioration of a semiconductor laser element is provided, by suppressing the intensity of oscillated light leakage leaking towards semiconductor laser side from the laser resonator with a simple configuration. A laser ignition device includes an excitation light source emitting coherent excitation light L, an optical element transmitting excitation light L, a laser resonator oscillating oscillated light having high energy density by being irradiated with excitation light L, and condensing means condensing the oscillated light Loscillated by the laser resonator . Moreover, the laser ignition device is provided with a light-transmissive-reflective film disposed between the excitation light source and the laser resonator . The light-transmissive-reflective is film permeating the excitation light Lhaving short wavelength and reflecting oscillated light leakage Lhaving long wavelength. 1. (canceled)2. (canceled)3. (canceled)4. (canceled)5. (canceled)6. (canceled)7. (canceled)8. (canceled)9. (canceled)10. (canceled)11. A laser ignition device that ignites an air-fuel mixture introduced into a combustion chamber of an internal combustion engine by condensing oscillated light having high energy density , the laser ignition device comprising:an excitation light source that emits coherent excitation light;a laser resonator that oscillates oscillated light having high energy density by being irradiated with the excitation light; andcondensing means that condenses the oscillated light oscillated by the laser resonator,wherein:a collimate lens is provided between the excitation light source and the laser resonator, the collimate lens modulating the excitation light transmitted from the excitation light source to be incident light of the laser resonator, the collimate lens including an end surface having a plane shape on an incident side where the excitation light is on incident;a light-transmissive- ...

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Номер записи: 39
19-04-2018 дата публикации

LASER SYSTEM HAVING A DUAL PULSE-LENGTH REGIME

Номер: US20180109066A1
Автор: Aviad Idan, Ben-Shlomo Albert, Cannon Chris, Har-Even Yehoram, Manor Yair, Shacham Alon
Принадлежит:

A single loop hardware-based system for producing laser pulses in a microsecond scale operational mode includes a GUI to enable a user to select the operational mode of the system; a laser source for producing one or more laser beam pulses, the laser source being a diode laser pump source module; a DSP which enables and disables a hardware-based FPGA. The FPGA controls the diode pump source module. When a user selects one or more microsecond scale laser sub-pulses on the GUI, the DSP transmits to the FPGA the sub-pulse energy level and the sub-pulse on-time selected by the user on the GUI. A photodetector operatively connected to the hardware-based system measures the power of the laser pulse beam that was transmitted to the photodetector and, in a feedback mode, transmits a feedback signal of that power measurement to the FPGA. The FPGA compares the power of the laser beam measured by the photodetector to the power of the laser beam selected by the user on the GUI. If the power level read by the FPGA is higher than the selected power level, the FGPA decreases the power level to the pumping source module for any subsequent laser pulses; and if the power level read by the FPGA is less than the selected power level, the FGPA increases the power level to the pumping source module for subsequent laser pulses. 1. A single loop hardware-based system for producing laser pulses in a microsecond scale operational mode comprising:a GUI to enable a user to select the operational mode of the system;a laser source for producing one or more laser beam pulses, the laser source being a diode laser pump source module;a DSP which enables and disables a hardware-based FPGA;wherein the FPGA controls the diode pump source module;wherein when a user selects one or more microsecond scale laser sub-pulses on the GUI, the DSP transmits to the FPGA the sub-pulse energy level and the sub-pulse on-time selected by the user on the GUI;wherein, a photodetector operatively connected to the ...

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Номер записи: 40
02-05-2019 дата публикации

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

Номер: US20190131756A1
Автор: Tokuhisa Akira
Принадлежит: NIKON CORPORATION

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

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Номер записи: 41
19-05-2016 дата публикации

Solid State Laser System

Номер: US20160141827A1
Автор: Valiente Miguel Galan
Принадлежит:

A laser system comprising an active medium () and at least one laser diode () that is adapted to pump the active medium, characterized in that the laser diode is arranged such that a radiation plane of laser radiation emitted from the laser diode and corresponding to the greatest emission angle a is essentially parallel or oblique to a longitudinal axis (L) of the active medium (). The pump LD array is arranged with the long axis of each LD being parallel to the longitudinal axis (L) of the active medium (). A laser system comprising an active medium and a reflector () being arranged such that the reflector surrounds the active medium () with at distance to the active medium characterized in that the reflector comprises a self-supporting cylinder consisting at least in part of a metal, e.g. copper, and a method for pumping an active medium of a Q-switch laser system with a plurality of laser diodes, the method being characterized in that the active medium is pumped continuously during pumping periods of a predetermined duration, the pumping periods being provided periodically and being separated by non-pumping periods, wherein, during each pumping period, at least two laser pulses are emitted from the active medium, wherein each of the at least two laser pulses is caused by a corresponding Q-switch operation in the pumping period. 1. A laser system for generating laser pulses , the system comprising a pumpable , solid state active medium , a plurality of pumping laser diodes for pumping the active medium , that are arranged in a cylinder mantle in parallel to a longitudinal axis of the active medium , and a resonator comprising first and second optical systems , wherein the first optical system is arranged on one side of the active medium and is adapted to reflect back radiation emitted from the active medium into the active medium , and the second optical system is arranged on an opposite side of the active medium and is adapted to reflect back radiation emitted ...

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Номер записи: 42
17-05-2018 дата публикации

DUAL MODE LASER TARGET DESIGNATOR/RANGEFINDER WITH AN OPTICAL PARAMETRIC OSCILLATOR-OPTICAL PARAMETRIC AMPLIFIER (OPO-OPA) CONVERTER

Номер: US20180138652A1
Автор: Kelly David P., McCarthy John C., Miller Christopher A., Pretorius Hermanus S., Snell Katherine J.
Принадлежит:

The current disclosure is directed to an apparatus and method of a Laser Designator/Rangefinder (LDR) having two wavelengths of 1064 nm and 1572 nm. The 1064 nm wavelength laser is generated by a pump diode by exciting Nd:YAG medium (source). The 1572 nm wavelength laser is produced using an OPO-OPA converted which is located in a by-pass path. Because the 1572 nm wavelength uses near diffraction limited signal, it provides long range identification and tracking capability needed for advanced tactical platforms, while using the smallest transmit aperture, in a low Size, Weight and Power Consumption (SWaP) package. 1. A long range laser target designator/rangefinder (LDR) system , comprising:a 1064 nm wavelength laser, wherein a medium of the laser is adapted to be excited by a laser pumping source;an optical beam selector, wherein the selector is selectable between a range finding mode and a target designation mode; andan optical parametric oscillator-optical parametric amplifier (OPO-OPA) converter system wherein the converter system comprises an OPO-OPA converter, a half wave plate and a beam reducer, wherein the 1064 nm wavelength laser passes through the OPO-OPA converter system if the range finding mode is selected.2. The LDR system of claim 1 , further comprising a beam expander located between the laser pumping source and the half wave plate.3. The LDR system of claim 1 , further comprising a polarizer located between the half wave plate and an optical parametric oscillator (OPO) of the OPO-OPA converter.4. The LDR system of claim 3 , further comprising a beam reducer located between the polarizer and the OPO.5. The LDR system of claim 4 , further comprising a first mirror located between the beam reducer and the OPO.6. The LDR system of claim 1 , further comprising a beam expander located between an optical parametric oscillator (OPO) of the OPO-OPA converter and an optical parametric amplifier (OPA) of the OPO-OPA converter.7. The LDR system of claim 6 , ...

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Номер записи: 43
14-08-2014 дата публикации

Multiple output diode driver with independent current control and output current modulation

Номер: US20140226688A1
Автор: Joe A. Ortiz
Принадлежит: Raytheon Co

The present technology provides a multiple output diode driver that includes a high side current source and at least two loads electrically coupled in series to the current source, each respective load including at least one laser diode. The multiple output diode driver can further include a shunt device electrically coupled in parallel with at least one of the at least two loads to reduce the DC pump current to its respective load. The shunt device can be a load element, a switching device, or any series coupled combination thereof.

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Номер записи: 44
08-09-2022 дата публикации

HIGH-PULSE-CONTRAST FIBER LASER TRANSMITTERS

Номер: US20220285904A1
Автор: Di Teodoro Fabio, ROCKWELL David A.
Принадлежит:

A system includes a signal seeder configured to generate a pulsed seed signal, where the signal seeder includes a master oscillator configured to generate an optical signal at a first wavelength. The system also includes a series of optical preamplifiers collectively configured to amplify the pulsed seed signal and generate an amplified signal. The system further includes a Raman fiber amplifier configured to amplify the amplified signal and generate a Raman-shifted amplified signal. The Raman fiber amplifier is configured to shift a wavelength of the amplified signal to a second wavelength different than the first wavelength during generation of the Raman-shifted amplified signal. 1. A system comprising:a signal seeder configured to generate a pulsed seed signal, the signal seeder comprising a master oscillator configured to generate an optical signal at a first wavelength;a series of optical preamplifiers collectively configured to amplify the pulsed seed signal and generate an amplified signal; anda Raman fiber amplifier configured to amplify the amplified signal and generate a Raman-shifted amplified signal, the Raman fiber amplifier configured to shift a wavelength of the amplified signal to a second wavelength different than the first wavelength during generation of the Raman-shifted amplified signal.2. The system of claim 1 , further comprising:an optical amplifier configured to amplify the Raman-shifted amplified signal.3. The system of claim 2 , wherein:the optical preamplifiers comprise rare-earth-doped fiber amplifiers; andthe optical amplifier comprises an additional rare-earth-doped fiber amplifier.4. The system of claim 3 , wherein:the rare-earth-doped fiber amplifiers and the additional rare-earth-doped fiber amplifier comprise ytterbium-doped fiber amplifiers;the signal seeder is configured to generate the pulsed seed signal at a wavelength in a range of about 1015 nanometers to about 1047 nanometers;the Raman fiber amplifier is configured to shift ...

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Номер записи: 45
26-05-2016 дата публикации

PULSE WIDTH STRETCHER AND CHIRPED PULSE AMPLIFIER INCLUDING THE SAME

Номер: US20160149368A1
Автор: JUNG Moon Youn, SONG Dong Hoon
Принадлежит:

Provided are a pulse width stretcher and a chirped pulse amplifier including the same. The pulse width stretcher includes first and second multiple reflection mirrors, and a pulse group-delay dispersion block disposed between the first and second multiple reflection mirrors and configured to refract a pulse laser beam to stretch a pulse width of the pulse laser beam. 1. A pulse width stretcher comprising:a first multiple reflection mirror comprising a first large area mirror and a first small area mirror in the first large area mirror, the first large area mirror reflecting a pulse laser beam;a second multiple reflection mirror comprising a second large area mirror and a second small area mirror in the second large area mirror, the second large area mirror disposed to face the first large area mirror; anda pulse group-delay dispersion block disposed between the first multiple reflection mirror and the second multiple reflection mirror, and configured to refract the pulse laser beam to stretch a pulse width of the pulse laser beam.2. The pulse width stretcher of claim 1 , wherein the pulse group-delay dispersion block comprises a dielectric cylinder.3. The pulse width stretcher of claim 2 , wherein the dielectric cylinder comprises silicon oxide.4. The pulse width stretcher of claim 1 , wherein the first and second large area mirrors respectively comprise first and second side holes fixing the first and second small area mirrors.5. The pulse width stretcher of claim 1 , wherein the first large area mirror comprises a concave mirror claim 1 , andthe second large area mirror comprises a flat mirror.6. A chirped pulse amplifier comprising:an oscillator configured to generate a pulse laser beam;a pulse width compressor separated from the oscillator and configured to compress a pulse width of the pulse laser;a pulse amplifier disposed between the pulse width stretcher and the oscillator and configured to amplify intensity of the pulse laser beam; anda pulse width ...

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Номер записи: 46
02-06-2016 дата публикации

MICROSTRUCTURED OPTICAL FIBER, SUPERCONTINUUM LIGHT SOURCE COMPRISING MICROSTRUCTURED OPTICAL FIBER AND USE OF SUCH LIGHT SOURCE

Номер: US20160156148A1
Автор: ALKESKJOLD Thomas T., Thomsen Carsten l., Thomsen Erik B.
Принадлежит: NKT Photonics A/S

The invention relates to a microstructured optical fiber for generating supercontinuum light. The optical fiber comprises a core and a cladding region surrounding the core. The optical fiber comprises a first fiber length section, a second fiber length section as well as an intermediate fiber length section between said first and second fiber length sections. The first fiber length section has a core with a first characteristic core diameter larger than about 7 μm. The second fiber length section has a core with a second characteristic core diameter, smaller than said first characteristic core diameter. The intermediate length section of the optical fiber comprises a core which is tapered from said first characteristic core diameter to said second characteristic core diameter over a tapered length. The invention also relates to a supercontinuum light source comprising an optical fiber according to the invention and a pump light source. 143-. (canceled)44. A microstructured optical fiber for generating supercontinuum light upon feeding of light having a first wavelength λ , the optical fiber having a length and a longitudinal axis along its length and comprising a core region for guiding light along the length of said optical fiber , and a first cladding region surrounding said core region , wherein:said optical fiber, along its length, comprises a first fiber length section, a second fiber length section as well as an intermediate fiber length section between said first and second fiber length sections,{'sub': '1', 'said first fiber length section has a core region with a first characteristic core diameter Win a cross-section through the microstructured optical fiber perpendicularly to the longitudinal axis, wherein said first characteristic core diameter is larger than about 7 μm,'}{'sub': 2', '2', '1, 'said second fiber length section has a core region with a second characteristic core diameter Win a cross-section through the microstructured optical fiber ...

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Номер записи: 47
17-06-2021 дата публикации

LIDAR AND LASER MEASUREMENT TECHNIQUES

Номер: US20210181321A1
Автор: Huang Shu-Wei, Li Peizhe
Принадлежит:

A dual-comb measuring system is provided. The dual comb measuring system may include a bi-directional mode-locked femtosecond laser, a high-speed rotation stage, and a fiber coupler. The high-speed rotation stage may be coupled to a pump diode. 1. A dual-comb measuring system comprising:a bidirectional mode-locked femtosecond laser; 'wherein the high-speed rotation stage is coupled to a pump diode; and', 'a high-speed rotation stage;'}a fiber coupler.2. The dual-comb measuring system of claim 1 , wherein the bi-directional mode-locked femtosecond laser is placed on the high-speed rotation stage.3. The dual-comb measuring system of claim 1 , wherein the bidirectional mode-locked femtosecond laser may generate two laser outputs.4. The dual-comb measuring system of claim 3 , wherein the two laser outputs may be combined.5. The dual-comb measuring system of claim 4 , wherein the two laser outputs may be combined using a standard fiber coupler.6. The dual-comb measuring system of claim 3 , wherein the two laser outputs may share a cavity.7. The dual-comb measuring system of claim 3 , wherein the two laser outputs may be mutually coherent in the nature.8. The dual-comb measuring system of claim 1 , wherein the high-speed rotation stage includes a fiber rotary joint.9. The dual-comb measuring system of claim 8 , wherein the fiber rotary joint facilitates the decoupling of a pump fiber from a cavity rotation.10. The dual-comb measuring system of claim 1 , where the measuring system utilizes Sagnac effect.11. The dual-comb measuring system of claim 1 , wherein the high-speed rotation stage has a speed of 10 claim 1 ,000 rpm.12. The dual-comb measuring system of claim 1 , wherein the high-speed rotation stage has a speed of 50 claim 1 ,000 rpm.13. A dual-sideband FMCW LiDAR system comprising:a modulated light generation unit;a transceiver unit; anda control and processing unit.14. The dual-comb measuring system of claim 13 , wherein the modulated light generation unit further ...

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Номер записи: 48
15-09-2022 дата публикации

Laser element, compound, method for producing compound and lasing sensitizer

Номер: US20220294190A1
Автор: Adikari Mudiyanselage Chathuranganie SENEVIRATHNE, Chihaya Adachi, Kohona Pahala Walawwe Buddhika Sanjeewa Bandara KARUNATHILAKA, Sangarange Don Atula SANDANAYAKA, Toshinori Matsushima, Umamahesh BALIJAPALLI
Принадлежит: Koala Technology Inc, Kyushu University NUC

Disclosed is a laser device containing a. compound represented by the following formula in a light-emitting layer, R 1 and R 5 each represent a substituent having a positive Hammett's σ p value, and R 2 to R 4 , and R 6 to R 15 each represent a hydrogen atom or a substituent.

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Номер записи: 49
01-06-2017 дата публикации

PULSED LASER FOR LIDAR SYSTEM

Номер: US20170155225A1
Автор: Eichenholz Jason M., Villeneuve Alain
Принадлежит:

In one embodiment, a laser system includes a seed laser configured to produce optical seed pulses. The laser system also includes a first fiber-optic amplifier configured to amplify the seed pulses by a first amplifier gain to produce a first-amplifier output that includes amplified seed pulses and amplified spontaneous emission (ASE). The laser system further includes a first optical filter configured to remove from the first-amplifier output an amount of the ASE. The laser system also includes a second fiber-optic amplifier configured to receive the amplified seed pulses from the first optical filter and amplify the received pulses by a second amplifier gain to produce output pulses. The output pulses have output-pulse characteristics that include: a pulse repetition frequency of less than or equal to 100 MHz; a pulse duration of less than or equal to 20 nanoseconds; and a duty cycle of less than or equal to 1%. 1. A laser system comprising:a seed laser configured to produce optical seed pulses;a first fiber-optic amplifier configured to amplify the seed pulses by a first amplifier gain to produce a first-amplifier output that comprises amplified seed pulses and amplified spontaneous emission (ASE);a first optical filter configured to remove from the first-amplifier output an amount of the ASE; and a pulse repetition frequency of less than or equal to 100 MHz;', 'a pulse duration of less than or equal to 20 nanoseconds; and', 'a duty cycle of less than or equal to 1%., 'a second fiber-optic amplifier configured to receive the amplified seed pulses from the first optical filter and amplify the received pulses by a second amplifier gain to produce output pulses, wherein the output pulses have output-pulse characteristics comprising2. The laser system of claim 1 , wherein the output-pulse characteristics further comprise:an operating wavelength of between approximately 1400 nm and 2050 nm;a pulse energy of greater than or equal to 10 nanojoules;a peak power of ...

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Номер записи: 50
22-09-2022 дата публикации

RAMAN AMPLIFIER WITH SHARED RESONATOR

Номер: US20220302669A1
Автор: Kost Alan, McCahon Stephen William, Quarles Gregory J.
Принадлежит: Applied Energetics, Inc.

A resonating optical amplifier includes a laser pump cavity defined by a first mirror and a second mirror with a laser pump gain medium configured within a first portion of the laser pump cavity and a Raman amplifier within a second portion of the laser pump cavity. A circulating pump-laser light is introduced to the laser pump gain medium forming a pump signal that is configured to bi-directionally propagate along a beam path within the laser pump cavity. The Raman amplifier is positioned in line with the beam path of the pump signal and operable to impart gain on a seed pulse. The seed pulse and the pump signal are co-aligned and linearly polarized. 1. A resonating optical amplifier , comprising:a laser pump cavity defined by a first mirror and a second mirror;a laser pump gain medium configured within a first portion of the laser pump cavity;a circulating pump-laser light configured to bi-directionally propagate through the laser pump gain medium along a beam path within the laser pump cavity forming a pump signal; anda Raman amplifier configured within a second portion of the laser pump cavity, the second portion of the laser pump cavity overlapping with the first portion of the laser pump cavity, operable to impart gain on a seed pulse along the beam path and wherein the seed pulse and the pump signal are co-aligned and linearly polarized.2. The resonating optical amplifier of claim 1 , further comprising a Q-switch configured within the laser pump cavity and aligned with the beam path.3. The resonating optical amplifier of claim 1 , wherein the pump signal is a continuous wave.4. The resonating optical amplifier of claim 1 , wherein the pump signal is a pump pulse.5. The resonating optical amplifier of claim 4 , wherein Raman interaction occurs in the Raman amplifier during propagation and counter-propagation of the pump pulse and propagation of the seed pulse.6. The resonating optical amplifier of claim 4 , wherein injection of the seed pulse and the pump ...

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Номер записи: 51
08-06-2017 дата публикации

Method and Apparatus for Determining Optical Fibre Characteristics

Номер: US20170163003A1
Автор: McClean Ian Peter, Sharma Manish
Принадлежит:

An optical amplifier assembly for determining a parameter of an optical fibre configured to amplify an optical signal being propagated therethrough, the assembly comprising: at least one amplifier pump light source assembly configured to transmit light at a plurality of wavelengths into the optical fibre; a receiver configured to receive light that has propagated through at least part of the optical fibre; and a processor configured to determine the parameter of the optical fibre based on the received light. 127-. (canceled)28. A master node for use in an optical system for determining a parameter of one or more optical fibres for use in an optical amplifier assembly , the master node configured to be in optical communication with a slave node via the one or more optical fibres and configured to transmit and receive optical signals according to a predetermined protocol ,wherein the master node is configured to transmit a first optical signal intended for a slave node and to receive a second optical signal transmitted by a slave node,and wherein the master node is further configured, if the second optical signal comprises raw signal data, to determine the parameter based on the raw signal data.29. A method for operating a master node for use in an optical system for determining a parameter of one or more optical fibres for use in an optical amplifier assembly , the master node configured to be in optical communication with a slave node via the one or more optical fibres and configured to transmit and receive optical signals according to a predetermined protocol , the method comprising:transmitting a first optical signal intended for a slave node;receiving a second optical signal transmitted by a slave node; andif the second optical signal comprises raw signal data, determining the parameter based on the raw signal data.30. A non-transitory computer readable medium comprising computer readable code configured claim 29 , when read by a computer claim 29 , to carry out ...

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Номер записи: 52
24-06-2021 дата публикации

DEVICE FOR MEASURING DISTANCES

Номер: US20210190916A1
Автор: BAN Christian
Принадлежит: Safran Vectronix AG

The inventive Device is comprising a laser rangefinder for determining the distance along a laser axis between the device and a target object. The laser rangefinder is comprising a pumping laser and a thulium and/or holmium doped fiber laser with a thulium and/or holmium doped fiber section and two Bragg gratings arranged on both sides of the thulium and/or holmium doped fiber section of the thulium and/or holmium doped fiber laser wherein the thulium and/or holmium doped fiber laser is pumped by the pumping laser and configured to emit laser light with a wavelength in the range of 1900 nm to 2150 nm. The inventive device has an improved applicability. 1. Device for measuring distances , comprising:a laser rangefinder for time-of-flight based distance determination along a laser axis between the device and a target object, the laser rangefinder comprising a laser transmission channel and a laser receiver channel, wherein the laser rangefinder comprises a pumping laser, a thulium and/or holmium doped fiber laser with a thulium and/or holmium doped fiber section in between two Bragg gratings and an emitting connection, wherein the thulium and/or holmium doped fiber laser is pumped by the pumping laser and configured to output laser light with a wavelength in the range of 1900 nm to 2150 nm.2. Device according to claim 1 , wherein the pumping laser is configured to provide laser light with a wavelength in the bandwidth of 1530 nm to 1610 nm.3. Device according to claim 1 , wherein the pumping laser is pulsed and thereby configured to generate pulse trains in the form of sets of pulses claim 1 , wherein consecutive sets of pulses are separated in time wherein the pumped thulium and/or holmium doped fiber laser is emitting corresponding pulse trains.4. Device according to claim 1 , wherein the emitting connection of the thulium and/or holmium doped fiber laser is comprising an optical component in the form of a Q-switch wherein the Q-switch is configured to abruptly ...

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Номер записи: 53
14-05-2020 дата публикации

Pulsed light generation device, pulsed light generation method, exposure apparatus having pulsed light generation device and inspection apparatus having pulsed light generation device

Номер: US20200153193A1
Автор: Akira Tokuhisa
Принадлежит: Nikon Corp

A pulsed light generation device, includes: a first optical fiber through which first pulsed light and second pulsed light, having an intensity that decreases while an intensity of the first pulsed light increases, and increases while the intensity of the first pulsed light decreases, having been multiplexed and entered therein, are propagated; and a second optical fiber at which the first pulsed light, having exited the first optical fiber and entered therein, is amplified while being propagated therein, wherein: at the first optical fiber, phase modulation occurs in the first pulsed light due to cross phase modulation caused by the second pulsed light; and self-phase modulation occurring in the first pulsed light at the second optical fiber is diminished by the phase modulation having occurred at the first optical fiber.

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Номер записи: 54
16-06-2016 дата публикации

MICROSTRUCTURED OPTICAL FIBER, SUPERCONTINUUM LIGHT SOURCE COMPRISING MICROSTRUCTURED OPTICAL FIBER AND USE OF SUCH LIGHT SOURCE

Номер: US20160170136A1
Автор: ANDERSEN Thomas Vestergaard, Bang Ole, FEUCHTER Thomas, JOHANSEN Jeppe, LARSEN Casper, Thomsen Carsten l.
Принадлежит: NKT Photonics A/S

The invention relates to a microstructured optical fiber for generating incoherent supercontinuum light upon feeding of pump light. The microstructured optical fiber has a first section and a second section. A cross-section through the second section perpendicularly to a longitudinal axis of the fiber has a second relative size of microstructure elements and preferably a second pitch that is smaller than a blue edge pitch for the second relative size of microstructure elements. The invention also relates to an incoherent supercontinuum source comprising a microstructured optical fiber according to the invention. 159-. (canceled)61. A microstructured optical fiber according to claim 60 , wherein said second pitch Λis smaller than a blue edge pitch Λ claim 60 , where said blue edge pitch Λis defined as a specific pitch giving the shortest possible blue edge wavelength of the supercontinuum light for said second relative size d/Λof microstructure elements.62. A microstructured optical fiber according to claim 60 , wherein the relative size d/Λof microstructure elements in the first cross-section is about 0.75 or less.63. A microstructured optical fiber according to claim 60 , wherein said microstructured optical fiber in said second cross-section has a group velocity matched wavelength GVMWin the range from about 650 nm to about 800 nm.64. A microstructured optical fiber according to claim 60 , wherein the second relative size d/Λof the microstructure elements is about 0.75 or less.65. A microstructured optical fiber according to claim 60 , wherein the second pitch Λis about 0.9 times the blue edge pitch Λor smaller.662. A microstructured optical fiber according to claim 60 , wherein said first zero dispersion wavelength ZDWof said second cross-section is less than about 1000 nm claim 60 , such as less than about 900 nm.67. A microstructured optical fiber according to claim 66 , wherein the second pitch Λis smaller than the first pitch Λ.68. A microstructured optical ...

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Номер записи: 55
15-06-2017 дата публикации

LIGHT SOURCE DEVICE AND INFORMATION ACQUISITION APPARATUS

Номер: US20170170620A1
Автор: Iwase Hideo
Принадлежит:

Provided is a light source device including a fiber laser, an amplifier, and a nonlinear fiber. Group delay dispersions D1 and D2 are a positive value, the light velocity in a vacuum is denoted as c, a spectral full width at half maximum of the pulse light is denoted as Δλ, the center wavelength of the pulse light is denoted as λ, a coefficient based on a shape of the pulse light is denoted as a, a value of the spectral full width at half maximum Δλ at which a function T(Δλ): 2. The light source device according to claim 1 , wherein a pulse full width at half maximum of the pulse light emitted from the fiber laser is represented by the function T(Δλ).3. The light source device according to claim 1 , wherein the resonator includes a saturable absorber that selectively transmits a pulse light.4. The light source device according to claim 1 , wherein the resonator includes a saturable absorber that selectively reflects a pulse light.5. The light source device according to claim 1 , wherein the resonator includes an optical filter that controls the spectral full width at half maximum Δλ of the pulse light.6. The light source device according to claim 1 , wherein the nonlinear fiber has an anomalous dispersion at the center wavelength λ.8. The light source device according to claim 1 , wherein the spectral full width at half maximum Δλ satisfies Δλ_3 dB≦Δλ≦Δλ_min.9. The light source device according to claim 1 , wherein all optical fibers and optical components included in the resonator have a positive group delay dispersion.10. The light source device according to claim 1 , wherein all optical fibers and optical components included in a optical path between the output terminal of the resonator and the input terminal of the nonlinear fiber have a positive group delay dispersion.11. The light source device according to claim 1 , wherein the amplifier includes a multistage amplifier.12. The light source device according to claim 1 , wherein a light emitted from the ...

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Номер записи: 56
15-06-2017 дата публикации

LIGHT SOURCE APPARATUS AND INFORMATION ACQUISITION APPARATUS USING SAME

Номер: US20170170621A1
Автор: Miura Shun
Принадлежит:

An introduction unit that introduces a pump light pulse having a first wavelength, a shaping unit that shapes a waveform of the pump light pulse, a nonlinear optical waveguide that generates a wavelength converted light pulse from a pump light pulse, the pump light pulse being a pulse that has been shaped in the shaping unit, through an optical parametric process, the wavelength converted light pulse including a second wavelength different from the first wavelength. The shaping unit shapes the waveform of the pump light pulse such that an absolute value of a time rate of change of the waveform at a peak area of the pump light pulse that has been shaped is smaller than an absolute value of a time rate of change of the waveform at a peak area of the pump light pulse before being shaped with the shaping unit. 1. A light source apparatus , comprising:an introduction unit that introduces a pump light pulse having a first wavelength;a shaping unit that shapes a waveform of the pump light pulse; anda nonlinear optical waveguide that generates a wavelength converted light pulse from a pump light pulse through an optical parametric process, wherein the pump light pulse being a pulse that has been shaped in the shaping unit, the wavelength converted light pulse including a second wavelength different from the first wavelength,wherein the shaping unit shapes the waveform of the pump light pulse such that an absolute value of a time rate of change of the waveform at a peak area of the pump light pulse that has been shaped is smaller than an absolute value of a time rate of change of the waveform at a peak area of the pump light pulse before being shaped with the shaping unit.2. The light source apparatus according to claim 1 ,wherein the shaping unit shapes the waveform of the pump light pulse such that the absolute value of the time rate of change of the waveform at the peak area of the pump light pulse that has been shaped is smaller than the absolute value of the time rate ...

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Номер записи: 57
29-09-2022 дата публикации

Ultrastable laser system based on polarization-maintaining optical fiber

Номер: US20220311202A1
Автор: Lingke Wang, Tang Li
Принадлежит: Shanghai Institute of Optics and Fine Mechanics of CAS

An ultrastable laser system is based on a polarization-maintaining optical fiber. The ultrastable laser system comprises a laser device; acousto-optic modulators, a first beam splitter, a polarizer, an optical fiber interferometer comprising a second beam splitter, an optical fiber delay line, a third acousto-optic modulator, and a beam combiner; a beam combiner, a polarization beam splitter, photoelectric detectors, a frequency synthesizer, frequency mixers, a servo feedback circuit and a piezoelectric ceramic. The temperature interference is eliminated based on the characteristic that refractive indexes of a fast axis and a slow axis of the polarization-maintaining optical fiber differently change with a temperature, a vacuum structure can be avoided, and the ultrastable laser system has low cost, small system, simple structure and high signal stability.

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Номер записи: 58
25-06-2015 дата публикации

Picosecond Laser Apparatus and Methods for Treating Target Tissues with Same

Номер: US20150180193A1
Автор: Daniel Hohm, Mirko Georgiev MIRKOV, Rafael A. Sierra, Richard Shaun Welches
Принадлежит: Cynosure LLC

Apparatuses and methods are disclosed for applying laser energy having desired pulse characteristics, including a sufficiently short duration and/or a sufficiently high energy for the photomechanical treatment of skin pigmentations and pigmented lesions, both naturally-occurring (e.g., birthmarks), as well as artificial (e.g., tattoos). The laser energy may be generated with an apparatus having a resonator with the capability of switching between a modelocked pulse operating mode and an amplification operating mode. The operating modes are carried out through the application of a time-dependent bias voltage, having waveforms as described herein, to an electro-optical device positioned along the optical axis of the resonator.

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Номер записи: 59
01-07-2021 дата публикации

Tunable laser materials comprising solid-state blended polymers

Номер: US20210203122A1
Автор: Kok Wai Cheah, Yi Jiang
Принадлежит: Hong Kong Baptist University HKBU

The present invention relates to a solid-state blended polymer system that has the property of tunable lasing wavelength through adjusting the blending ratio. It can be used for health monitoring, environmental monitoring sensor and tissue imaging. Current materials do not have the broad tunable range; from blue to infra-red across the optical range. By using the same two polymers, it is possible to produce laser emitting blue to red colour. It simplifies the design, eases multi-wavelength laser sensor system integration and therefore, making the production cost-effective.

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Номер записи: 60
18-09-2014 дата публикации

HIGH POWER PULSED LIGHT GENERATION DEVICE

Номер: US20140268313A1
Автор: Nakai Michihiro
Принадлежит: FUJIKURA LTD.

A high power pulsed light generation device includes: a master clock generator that generates a master signal; an optical oscillator that generates a pulsed light synchronized with the master clock signal; an optical amplifier that amplifies the pulsed light emitted from the optical oscillator to output a high power pulsed light; a pump semiconductor laser that generates a pulsed light for pumping the optical amplifier; a driving unit that drives the pump semiconductor laser by a pulsed driving current synchronized with the master clock signal; and a control unit which controls the driving unit and controls a gain of the optical amplifier for each pulse by changing a pulse width of the pulsed drive current from driving unit so as to change the pulse width of the pumping pulsed light. 1. A high power pulsed light generation device comprising:a master clock generator that generates a master clock signal;an optical oscillator that generates a pulsed light synchronized with the master clock signal;an optical amplifier that amplifies the pulsed light emitted from the optical oscillator to output a high power pulsed light;a pump semiconductor laser that generates a pulsed light for pumping the optical amplifier;a driving unit that drives the pump semiconductor laser by a pulsed driving current synchronized with the master clock signal; anda control unit which controls the driving unit and controls a gain of the optical amplifier for each pulse by changing a pulse width of the pulsed drive current from driving unit so as to change the pulse width of the pumping pulsed light.2. The high power pulsed light generation device according to claim 1 ,wherein the control unit is configured such that immediately after changing the state of the high power pulsed light generation device from an OFF state where the driving of the pump semiconductor laser stops and the high power pulsed light is not output from the optical amplifier to an ON state where the driving of the pump ...

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Номер записи: 61
22-06-2017 дата публикации

YB: AND ND: MODE-LOCKED OSCILLATORS AND FIBER SYSTEMS INCORPORATED IN SOLID-STATE SHORT PULSE LASER SYSTEMS

Номер: US20170179676A1
Автор: BENDETT Mark, CHO Gyu C., FERMANN Martin E., Gu Xinhua, HARTER Donald J., HARTL Ingmar, LIU Zhenlin, NATI Salvatore F., SHAH Lawrence
Принадлежит: IMRA AMERICA, INC.

The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier. 1. A pulse source , comprising:a seed source emitting seed pulses, said seed source generating pulses at a repetition rate and comprising a polarization maintaining gain fiber;at least one polarization maintaining fiber amplifier disposed downstream from said seed source;one or more pump laser diodes for pumping said seed source and said at least one fiber amplifier;a bulk optical amplifier receiving amplified pulses from said at least one amplifier and producing output pulses;an electro-optic or acousto-optic modulator configured as a down counter to reduce a repetition rate of pulses generated by said seed source, said modulator disposed between said seed source and said bulk optical amplifier.2. The pulse source according to claim 1 , wherein said seed source comprises a Yb: mode locked oscillator claim 1 , wherein said polarization maintaining gain fiber is Yb: doped fiber operating in a positive dispersion regime claim 1 , and wherein the cavity of said Yb: mode locked oscillator is configured without negative dispersion cavity components.3. The pulse source according to claim 1 , wherein a gain medium of said bulk optical amplifier comprises Yb:YAG crystal material.4. The pulse source according to claim 1 , wherein a gain medium of said bulk amplifier comprises Nd:YAG claim 1 , Nd:YLF claim 1 , Nd:YVO. claim 1 , Nd:glass claim 1 , Yb claim 1 , glass claim 1 , Nd:KGW claim 1 , or a narrow bandwidth Nd-based crystal.5. The pulse source according to claim 1 , wherein said bulk amplifier comprises a regenerative amplifier claim 1 , a rod claim 1 , slab claim 1 , or thin disk claim 1 ,6. The pulse source according to claim 1 , wherein said ...

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Номер записи: 62
02-07-2015 дата публикации

Method and Apparatus for Determining Optical Fibre Characteristics

Номер: US20150188285A1
Автор: McClean Ian Peter, Sharma Manish
Принадлежит: II-VI Incorporated

An optical amplifier assembly for determining a parameter of an optical fibre configured to amplify an optical signal being propagated therethrough, the assembly comprising: at least one amplifier pump light source assembly configured to transmit light at a plurality of wavelengths into the optical fibre; a receiver configured to receive light that has propagated through at least part of the optical fibre; and a processor configured to determine the parameter of the optical fibre based on the received light. 1. An optical amplifier assembly for determining a parameter of an optical fibre configured to amplify an optical signal being propagated therethrough , the assembly comprising:at least one amplifier pump light source assembly configured to transmit light at a plurality of wavelengths into the optical fibre;a receiver configured to receive light that has propagated through at least part of the optical fibre; anda processor configured to determine the parameter of the optical fibre based on the received light.2. The optical amplifier assembly according to claim 1 , wherein the parameter of the optical fibre comprises the chromatic dispersion of the optical fibre and/or the length of the optical fibre.3. The optical amplifier assembly according to claim 1 , wherein the at least one amplifier pump light source assembly comprises a tunable amplifier pump light source configured to output light selectively at one of a first and second wavelength.414. The optical amplifier assembly according to claim 3 , wherein the tunable amplifier pump light source is a tunable XX laser device.5. The optical amplifier assembly according to claim 1 , wherein the at least one amplifier pump light source comprises a first amplifier pump light source configured to output light at a first wavelength and a second amplifier pump light source configured to output light at a second wavelength.6. The optical amplifier assembly according to claim 1 , wherein the processor is further ...

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Номер записи: 63
28-06-2018 дата публикации

SUPERCONTINUUM LIGHT SOURCE COMPRISING MICROSTRUCTURED OPTICAL FIBER

Номер: US20180180802A1
Автор: ANDERSEN Thomas Vestergaard, Bang Ole, FEUCHTER Thomas, JOHANSEN Jeppe, LARSEN Casper, Thomsen Carsten l.
Принадлежит: NKT Photonics A/S

The invention relates to a microstructured optical fiber for generating supercontinuum light upon feeding of pump light. The light can be incoherent light. The microstructured optical fiber has a first section and a second section, where the first and second sections have one or more different features. The invention also relates to a supercontinuum source comprising a microstructured optical fiber according to the invention. 159.-. (canceled)61. The microstructured optical fiber according to claim 60 , wherein said second pitch Λis smaller than a blue edge pitch Λ claim 60 , where said blue edge pitch Λ claim 60 , is defined as a specific pitch giving the shortest possible blue edge wavelength of the supercontinuum light for said second relative size d/Λof microstructure elements.62. The microstructured optical fiber according to claim 60 , wherein the relative size d/Λof microstructure elements in the first cross-section is about 0.75 or less.63. The microstructured optical fiber according to claim 60 , wherein said microstructured optical fiber in said second cross-section has a group velocity matched wavelength GVMWin the range from about 650 nm to about 800 nm.64. The microstructured optical fiber according to claim 60 , wherein the second relative size d/Λof the microstructure elements is about 0.75 or less.65. The microstructured optical fiber according to claim 60 , wherein the second pitch Λis about 0.9 times the blue edge pitch Λor smaller.66. The microstructured optical fiber according to claim 60 , wherein said first zero dispersion wavelength ZDW2of said second cross-section is less than about 1000 nm.67. The microstructured optical fiber according to claim 66 , wherein the second pitch Λis smaller than the first pitch Λ.68. The microstructured optical fiber according to claim 66 , where said second pitch Λis in the range from about 1.1 μm to about 1.7 μm.69. The microstructured optical fiber according to claim 60 , wherein the microstructured optical ...

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Номер записи: 64
04-06-2020 дата публикации

WAVELENGTH BEAM COMBINING LASER SYSTEMS WITH HIGH BEAM QUALITY FACTOR

Номер: US20200174264A1
Автор: Chann Bien, Cruz Michael, Huang Robin, Tayebati Parviz, ZHOU Wang-Long
Принадлежит:

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. 15.-. (canceled)6. A laser apparatus comprising:a plurality of laser emitters arranged in an array and each emitting a laser beam at a different wavelength, the plurality of laser beams collectively forming an array having first and second orthogonal dimensions;focusing optics for receiving the plurality of laser beams and combining the plurality of laser beams along the first dimension to form a combined beam;a plurality of dispersive elements positioned to receive the combined beam and transmit a multi-wavelength beam, each dispersive element (i) being disposed at a different angle with respect to the combined beam, and (ii) transmitting a band of the multi-wavelength beam being composed of a different set of wavelengths;a partially reflective output coupler positioned to receive the multi-wavelength beam, transmit a portion of the multi-wavelength beam therethrough, and reflect a second portion of the multi-wavelength beam back toward the plurality of dispersive elements; anda plurality of dichroic elements positioned to (i) receive the portion of the multi-wavelength beam transmitted by the partially reflective output coupler, (ii) separate the portion of the multi-wavelength beam into the plurality of bands, and (iii) spatially overlap the separated bands into a final overlapped beam.7. The laser apparatus of claim 6 , wherein each dispersive element comprises a diffraction grating.8. The laser apparatus of claim 6 , wherein the focusing optics comprises at least one of a cylindrical lens or a cylindrical mirror.9. The laser apparatus of claim 6 , wherein each dichroic element comprises a dichroic mirror claim 6 , a dichroic filter claim 6 , or an interference filter.10. The laser apparatus of claim 6 , ...

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Номер записи: 65
13-06-2019 дата публикации

COMMON MODE NOISE SUPPRESSION OF OPTICAL FREQUENCY COMBS FOR OPTICAL CLOCK APPLICATIONS

Номер: US20190181611A1
Автор: Maleki Lute, Matsko Andrey B.
Принадлежит:

The disclosure relates in some aspects to a two-point locking system for stabilizing a frequency comb oscillator using at least two optical transitions of the same atomic/molecular sample. In an example, an optical reference sample is provided that is characterized by two or more optical transitions. A coherent light source provides polychromatic coherent light (such as an optical frequency comb). The beams of light, occupying the same spatial mode volume or separated in space, and having frequencies in the vicinity of the optical transitions of the reference sample, interrogate the resonances of the reference sample. Interrogation signals obtained using phase/frequency/amplitude spectroscopy or other spectroscopy techniques are then used to stabilize the frequency harmonics of the light. If the harmonics belong to the same coherent frequency comb, the entire comb becomes stabilized using this procedure. In an illustrative example, a stable atomic optical clock is provided using these techniques. 1. An apparatus , comprising:an optical reference sample with first and second optical transitions at different wavelengths;a coherent light source configured to provide polychromatic coherent light, the coherent light source optically coupled to the optical reference sample; anda stabilization system configured to provide stabilization of the polychromatic coherent light based on the first and second optical transitions of the reference sample.2. The apparatus of claim 1 , wherein the stabilization system is configured to provide stabilization of at least two frequency harmonics of the polychromatic coherent light based on a correlation between the wavelengths of the first and second optical transitions with respect to any environmental perturbations.3. The apparatus of claim 1 ,wherein the coherent light source includes a first coherent light source optically coupled to the optical reference sample and modulated by the first optical transition of the optical reference ...

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Номер записи: 66
04-06-2020 дата публикации

Picosecond Laser Apparatus and Methods for Treating Target Tissues with Same

Номер: US20200176945A1
Автор: Mirkov Mirko Georgiev, Sierra Rafael Armando
Принадлежит: Cynosure, LLC

Apparatuses and methods are disclosed for applying laser energy having desired pulse Characteristics, including a sufficiently short duration and/or a sufficiently high energy for the photomechanical treatment of skin pigmentations and pigmented lesions, both naturally-occurring (e.g., birthmarks), as well as artificial (e.g., tattoos). The laser energy may be generated with an apparatus having a resonator with the capability of switching between a modelocked pulse operating mode and an amplification operating mode. The operating modes are carried out through the application of a time-dependent bias voltage, having waveforms as described herein, to an electro-optical device positioned along the optical axis of the resonator. 137.-. (canceled)38. A method of treating a target tissue comprising wrinkles , the method comprising:generating, using a laser source, an output beam having a subnanosecond pulse duration;modifying the output beam, using an optical system, to provide a photomechanically disruptive treatment beam;directing the photomechanically disruptive treatment beam to one or more regions of the target tissue comprising wrinkles;photomechanically disrupting the one or more regions of the target tissue comprising wrinkles; andevening out a surface of the target tissue comprising wrinkles in response to photomechanically disrupting the one or more regions of target tissue.39. The method of further comprising rejuvenating the target tissue.40. The method of wherein rejuvenating the target tissue comprises inducing epithelial cell restoration within the target tissue in response to photomechanically disrupting the one or more regions of the target tissue.41. The method of wherein rejuvenating the target tissue comprises increasing amount of collagen disposed therein relative to untreated tissue.42. The method of wherein the photomechanically disruptive treatment beam has a non-uniform beam profile claim 38 , the non-uniform beam profile comprising a plurality of ...

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Номер записи: 67
06-07-2017 дата публикации

BLACK SUB-ANODIZED MARKING USING PICOSECOND BURSTS

Номер: US20170189992A1
Автор: Dittli Adam, Gross Ken
Принадлежит: nLIGHT, Inc.

A method includes generating a plurality of pulse bursts with a predetermined quantity of intra-burst pulses in each pulse burst and a temporal spacing between the intra-burst pulses, and with a pulse burst frequency, and scanning the pulse bursts across an anodized target at a scan rate so that the pulse bursts overlap at the anodized target by an amount that is above an overlap damage threshold and the intra-burst pulses provide a peak power and peak fluence that are below an ablation threshold of the anodized target so as to produce a laser mark on the anodized target with an L value of less than or equal to 30 and without a damage to an anodized layer of the anodized target. 1. A method , comprising:generating a plurality of pulse bursts with a predetermined quantity of intra-burst pulses in each pulse burst and a temporal spacing between the intra-burst pulses, and with a pulse burst frequency; andscanning the pulse bursts across an anodized target at a scan rate so that the pulse bursts overlap at the anodized target by an amount that is above an overlap damage threshold and the intra-burst pulses provide a peak power and peak fluence that are below an ablation threshold of the anodized target so as to produce a laser mark on the anodized target with an L value of less than or equal to 30 and without a damage to an anodized layer of the anodized target.2. The method of claim 1 , wherein the intra-burst pulse temporal spacing and intra-burst pulse quantity are selected so that an area of the laser mark in a direction of the scanning has an elongated shape.3. The method of claim 1 , wherein the scanning includes providing the pulse bursts with a selected defocus in relation to the anodized target so that the pulse bursts are scanned across the anodized target with a spot size larger than a beam waist associated with the pulse bursts so as to reduce the peak power and peak fluence of the pulse bursts below the ablation threshold.4. The method of claim 1 , wherein ...

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Номер записи: 68
07-07-2016 дата публикации

LASER CONTROL SYSTEM AND METHOD

Номер: US20160197451A1
Автор: Fortin Tom, Kraemer Darren
Принадлежит:

In a laser control system, control circuit, and method, a master oscillator laser generates a seed laser pulse train. An optical modulator receives the pulse train and modulate the pulse train based on a modulation signal to generate modulated seed pulses. A laser amplifier amplifies the modulated seed pulses to generate an amplified pulse sequence output. A control circuit controls the operation of the optical modulator. The control circuit receives a clock signal synchronized with the seed laser pulse train and a trigger input for asynchronous modulation of the seed laser pulse train, generates the modulation signal, and communicates the modulation signal to the optical modulator. The modulation signal controls the optical modulator to selectively transmit and attenuate seed pulses from the seed laser pulse train to produce modulated seed pulses corresponding to the trigger input and attenuated to maintain a predetermined amplitude envelope in the pulse sequence output. 1. A laser control system comprising:a master oscillator laser configured to generate a seed laser pulse train at a first repetition rate;an optical modulator configured to receive the pulse train from the master oscillator laser and modulate the pulse train based on a received modulation signal to generate modulated seed pulses;{'b': '228', 'a laser amplifier configured to amplify the modulated seed pulses () to generate an amplified pulse sequence output; and'} receive a clock signal synchronized with the seed laser pulse train;', 'receive a trigger input for asynchronous modulation of the seed laser pulse train;', 'generate the modulation signal; and', {'b': 224', '204', '226', '228', '222', '230, 'communicate the modulation signal to the optical modulator, wherein the modulation signal () is configured to control the optical modulator () to selectively transmit and attenuate seed pulses from the seed laser pulse train () to produce modulated seed pulses () corresponding to the trigger input () ...

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Номер записи: 69
06-07-2017 дата публикации

Gain control for arbitrary triggering of short pulse lasers

Номер: US20170194759A1
Автор: Hubert Ammann, Marco Benetti
Принадлежит: Lumentum Operations LLC

A device may include a transient optical amplifier having stored energy associated with a lower boundary and an upper boundary of a dynamic equilibrium, and a target level defining stored energy for amplifying a high energy input pulse to a higher energy output pulse. The device may include a pump to increase the amplifier's stored energy, and a source to pass low energy control pulses or the high energy input pulse to the amplifier. The device may include a controller configured to maintain the amplifier's stored energy in the dynamic equilibrium by requesting low energy control pulses for the amplifier at a high repetition frequency. The controller may wait to receive a trigger. Based on receiving the trigger, the device may stop passing low energy control pulses to the amplifier, and may pass the high energy input pulse to the amplifier when the amplifier's stored energy reaches the target level.

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Номер записи: 70
23-07-2015 дата публикации

High power parallel fiber arrays

Номер: US20150207289A1
Автор: Andrius Marcinkevicius, Ingmar Hartl, Liang Dong, Martin Fermann
Принадлежит: IMRA America Inc

High power parallel fiber arrays for the amplification of high peak power pulses are described. Fiber arrays based on individual fiber amplifiers as well as fiber arrays based on multi-core fibers can be implemented. The optical phase between the individual fiber amplifier elements of the fiber array is measured and controlled using a variety of phase detection and compensation techniques. High power fiber array amplifiers can be used for EUV and X-ray generation as well as pumping of parametric amplifiers.

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Номер записи: 71
02-10-2014 дата публикации

APPARATUS AND METHOD FOR GENERATING ULTRASHORT LASER PULSES

Номер: US20140293404A1
Автор: PIERROT Simonette, Salin Francois
Принадлежит: EOLITE SYSTEMS

An apparatus includes a pulse conditioner and an amplifier. The pulse conditioner configured modifies a temporal intensity profile of an input laser pulse, thereby creating a conditioned laser pulse having conditioned temporal intensity profile with a misfit parameter, M, of less than 0.13, where: 2. The apparatus of claim 1 , wherein the pulse conditioner is further configured to broaden a spectral bandwidth of the input laser pulse such that the conditioned laser pulse has a conditioned spectral bandwidth.4. The apparatus of claim 1 , wherein at least one of the pulse conditioner and the amplifier is further configured to at least quasi-linearly chirp the conditioned laser pulse.5. The apparatus of claim 1 , further comprising a pulse compressor configured to temporally compress the amplified laser pulse claim 1 , thereby generating a compressed laser pulse.7. The apparatus of claim 1 , further comprising a parabolic pulse source claim 1 , the parabolic pulse source comprising:a seed laser configured to generate the input laser pulse having an input temporal intensity profile.8. The apparatus of claim 7 , wherein the input temporal intensity profile of the input laser pulse is a chosen one of a Gaussian profile claim 7 , a sech2 profile claim 7 , and a Lorentzian profile.9. The apparatus of claim 1 , wherein the conditioned laser pulse has a conditioned pulse duration greater than an input laser pulse duration of the input laser pulse.10. The apparatus of claim 5 , wherein a compressed pulse duration is in a range from 10 to 100 times less than a conditioned pulse duration.11. The apparatus of claim 5 , wherein a compressed pulse duration is in a range from 10 to 60 times less than an input laser pulse duration.12. The apparatus of claim 5 , wherein a compressed pulse duration is in a range from 0.1 ps to 10 ps.13. The apparatus of claim 1 , wherein the input laser pulse has an input spectral bandwidth in a range from 0.01 nm to 1 nm.14. The apparatus of claim 1 , ...

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Номер записи: 72
18-06-2020 дата публикации

Discriminative Remote Sensing And Surface Profiling Based On Superradiant Photonic Backscattering

Номер: US20200194958A1
Автор: Huang Yuping
Принадлежит: The Trustees of the Stevens Institute of Technology

Disclosed is a system and method for remote sensing, surface profiling, object identification, and aiming based on two-photon population inversion and subsequent photon backscattering enhanced by superradiance using two co-propagating pump waves. The present disclosure enables efficient and highly-directional photon backscattering by generating the pump waves in properly pulsed time-frequency modes, proper spatial modes, with proper group-velocity difference in air. The pump waves are relatively delayed in a tunable pulse delay device and launched to free space along a desirable direction using a laser-pointing device. When the pump waves overlap in air, signal photons will be created through two-photon driven superradiant backscattering if target gas molecules are present. The backscattered signal photons propagate back, picked using optical filters, and detected. By scanning the relative delay and the launching direction while the signal photons are detected, three-dimensional information of target objects is acquired remotely. 1generating co-propagating pulsed pump waves having shaped time-frequency modes, spatial modes, and group-velocity difference;relatively delaying the pump waves for a predetermined time period;launching pump pulses to a free space along a predetermined direction;backscattering a signal wave when the pump waves overlap in the free space;detecting backscattered signal photons; andscanning the predetermined direction of the launched pump pulses and the time period of the relative delay of the pump waves to remotely obtain three-dimensional information of target objects.. A method, comprising: This is a Section 111(a) application relating to and claiming the benefit of co-pending U.S. Provisional Patent Application No. 62/373,625, filed Aug. 11, 2016, the disclosure of which is incorporated by reference in its entirety herein.The present disclosure generally relates to remote sensing, surface profiling, object identification, and aiming based ...

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Номер записи: 73
06-08-2015 дата публикации

Beam Combiner and a Combiner Depolariser

Номер: US20150219917A1
Автор: Adrian Perrin Janssen
Принадлежит: II VI Inc

The invention relates to a beam combiner for a Raman pump unit. The beam combiner is configured to receive and propagate at least two orthogonally polarised collimated light beams. The beam combiner comprises a birefringent prism and an optically isotropic prism. Each of the prisms is located in the path of the beams and configured so that the beams are substantially parallel to each other when they emanate from the beam combiner.

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Номер записи: 74
04-08-2016 дата публикации

HIGH POWER PARALLEL FIBER ARRAYS

Номер: US20160226209A1
Автор: Dong Liang, FERMANN Martin, HARTL Ingmar, MARCINKEVICIUS Andrius
Принадлежит: IMRA AMERICA, INC.

High power parallel fiber arrays for the amplification of high peak power pulses are described. Fiber arrays based on individual fiber amplifiers as well as fiber arrays based on multi-core fibers can be implemented. The optical phase between the individual fiber amplifier elements of the fiber array is measured and controlled using a variety of phase detection and compensation techniques. High power fiber array amplifiers can be used for EUV and X-ray generation as well as pumping of parametric amplifiers. 1. A high peak power fiber amplifier system , comprising:{'b': '10', 'an array of fiber amplifiers in a multicore fiber, a spatial separation of the cores of said amplifiers being sufficiently small to provide strong thermal coupling therebetween which limits output phase fluctuations of the array to less than about kHz, and sufficiently large to substantially limit optical mode coupling between amplifiers of the array, wherein said multicore fiber comprises a plurality of leakage channel fibers having leakage channels disposed between the cores of said amplifiers, wherein said leakage channel fibers are filled with air or a glass having a reduced refractive index;'}a plurality of phase-control elements arranged in a spatial relation and optically connected to fiber amplifiers of said array, said elements modifying an optical phase of at least one fiber amplifier output in response to a phase control signal; anda phase controller generating said phase control signal, wherein said phase control signal and said phase control elements stabilize the optical output phase of the majority of said individual fiber amplifiers.2. The fiber amplifier system according to claim 1 , wherein said amplifier system comprises a multicore fiber claim 1 , and said array is circular such that said amplifiers are disposed in a single ring and approximately equidistant from a common center.3. The high peak power amplifier system according to claim 1 , wherein said multi-core fiber ...

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Номер записи: 75
18-07-2019 дата публикации

Picosecond Optical Radiation Systems and Methods of Use

Номер: US20190216543A1
Автор: Mirkov Mirko Georgiev, Sierra Rafael Armando
Принадлежит: Cynosure, LLC

Methods, systems and apparatus are disclosed for delivery of pulsed treatment radiation by employing a pump radiation source generating picosecond pulses at a first wavelength, and a frequency-shifting resonator having a lasing medium and resonant cavity configured to receive the picosecond pulses from the pump source at the first wavelength and to emit radiation at a second wavelength in response thereto, wherein the resonant cavity of the frequency-shifting resonator has a round trip time shorter than the duration of the picosecond pulses generated by the pump radiation source. Methods, systems and apparatus are also disclosed for providing beam uniformity and a sub-harmonic resonator. 155-. (canceled)56. An apparatus for delivery of pulsed treatment radiation comprising:a pump radiation source generating pumping pulses at a first wavelength, anda wavelength-shifting resonator having a lasing medium and resonant cavity configured to receive the pumping pulses from the pump radiation source at the first wavelength and to emit radiation at a second wavelength with a pulse duration shorter than the pulse duration of the pump radiation source in response thereto,wherein the resonant cavity of the wavelength-shifting resonator has a round trip time shorter than the duration of the pumping pulses.57. The apparatus of claim 56 , wherein the wavelength-shifting resonator operates without use of a modelocker or a Q-switch.58. The apparatus of claim 56 , wherein the wavelength-shifting resonator emits a subnanosecond pulse.59. The apparatus of claim 56 , wherein the wavelength-shifting resonator has a cavity length less than 10 millimeters.60. The apparatus of claim 56 , wherein the lasing medium of the wavelength-shifting resonator comprises a neodymium-doped crystal.61. The apparatus of claim 56 , wherein the lasing medium of the wavelength-shifting resonator comprises a solid state crystal medium selected from the group consisting of neodymium-doped yttrium-aluminum ...

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Номер записи: 76
30-10-2014 дата публикации

Picosecond Optical Radiation Systems and Methods of Use

Номер: US20140321484A1
Автор: Christian Hoffman, Daniel Hohm, John Robertson, Mirko Georgiev MIRKOV, Rafael Armando Sierra
Принадлежит: Cynosure LLC

Methods, systems and apparatus are disclosed for delivery of pulsed treatment radiation by employing a pump radiation source generating picosecond pulses at a first wavelength, and a frequency-shifting resonator having a lasing medium and resonant cavity configured to receive the picosecond pulses from the pump source at the first wavelength and to emit radiation at a second wavelength in response thereto, wherein the resonant cavity of the frequency-shifting resonator has a round trip time shorter than the duration of the picosecond pulses generated by the pump radiation source. Methods, systems and apparatus are also disclosed for providing beam uniformity and a sub-harmonic resonator.

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Номер записи: 77
18-07-2019 дата публикации

Picosecond Laser Apparatus and Methods for Treating Target Tissues with Same

Номер: US20190221989A1
Автор: Mirkov Mirko Georgiev, Sierra Rafael Armando
Принадлежит: Cynosure, LLC

Apparatuses and methods are disclosed for applying laser energy having desired pulse characteristics, including a sufficiently short duration and/or a sufficiently high energy for the photomechanical treatment of skin pigmentations and pigmented lesions, both naturally-occurring (e.g., birthmarks), as well as artificial (e.g., tattoos). The laser energy may be generated with an apparatus having a resonator with the capability of switching between a modelocked pulse operating mode and an amplification operating mode. The operating modes are carried out through the application of a time-dependent bias voltage, having waveforms as described herein, to an electro-optical device positioned along the optical axis of the resonator. 137-. (canceled)38. A method of treating a target tissue comprising:generating, using a laser source, an output beam having a subnanosecond pulse duration;modifying the output beam, using an optical system, to provide a photomechanically disruptive treatment beam;directing the photomechanically disruptive treatment beam to one or more regions of the target tissue;photomechanically disrupting the one or more regions of the target tissue; andinducing collagen restoration within the target tissue in response to photomechanically disrupting the one or more regions of target tissue.39. The method of further comprising rejuvenating the target tissue.40. The method of wherein rejuvenating the target tissue comprises inducing epithelial cell restoration within the target tissue in response to photomechanically disrupting the one or more regions of the target tissue.41. The method of wherein rejuvenating the target tissue comprises increasing amount of collagen disposed therein relative to untreated tissue.42. The method of wherein the photomechanically disruptive treatment beam has a non-uniform beam profile claim 38 , the non-uniform beam profile comprising a plurality of regions of relatively high energy per unit area dispersed within a substantially ...

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Номер записи: 78
18-07-2019 дата публикации

DEGRADATION DETECTION FOR A PULSED LASER

Номер: US20190221991A1
Автор: ALONIS Joseph J., EYRES Loren A., MOREHEAD James J., VANVEGHTEN Tobyn
Принадлежит:

A device may determine at least one metric related to a plurality of laser pulses associated with a Q-switched laser. The device may determine a statistical metric for the at least one metric related to the plurality of laser pulses. The device may determine that the statistical metric satisfies a threshold level of deviation of the at least one metric related to the plurality of laser pulses from a baseline value for the at least one metric. The device may indicate laser degradation of the Q-switched laser based on determining that the statistical metric satisfies the threshold. 1. A device , comprising:one or more memories; and determine a set of build-up time metrics or pulse width metrics for a set of laser pulses of a pulsed laser;', 'determine, based on the set of build-up time metrics or pulse width metrics, a condition for the pulsed laser; and', 'indicate the condition for the pulsed laser., 'one or more processors, communicatively coupled to the one or more memories, to2. The device of claim 1 , wherein the one or more processors claim 1 , when determining the condition claim 1 , are to:compare a first subset of the set of build-up time metrics or pulse width metrics associated with even laser pulses of the set of laser pulses to a second subset of the set of build-up time metrics or pulse width metrics associated with odd laser pulses of the set of laser pulses;determine, based on comparing the first subset to the second subset, that a threshold is satisfied between the first subset and the second subset; anddetermine the condition based on determining that the threshold is satisfied.3. The device of claim 1 , wherein the condition is a present condition or a predicted future condition.4. The device of claim 1 , wherein the one or more processors claim 1 , when determining the condition claim 1 , are to:determine a standard deviation for values of the set of build-up time metrics or pulse width metrics;determine that the standard deviation satisfies a ...

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Номер записи: 79
18-08-2016 дата публикации

GENERATING TWO SYNCHRONIZED TRAINS OF LASER PULSES

Номер: US20160240994A1
Автор: Zach Armin
Принадлежит: TOPTICA PHOTONICS AG

A method and system generates two synchronized trains of laser pulses at different wavelengths, wherein the two pulse trains are temporally synchronized and have a stable phase relation, and wherein the wavelength of one of the pulse trains is de-tunable. The method includes the steps of: generating a train of ultra-short seed laser pulses; splitting the train of seed laser pulses into a first pulse train and a second pulse train; and frequency-shifting the first pulse train by soliton self-frequency shift in an optically pumped waveguide having anomalous dispersion, wherein the spectrum of the frequency-shifted first pulse train is de-tunable by varying the pump power. 1. Method for generating two synchronized trains of laser pulses , comprising the steps of:generating a train of ultra-short seed laser pulses,splitting the train of seed laser pulses into a first pulse train and a second pulse train;frequency-shifting the first pulse train by soliton self-frequency shift in an optically pumped waveguide having anomalous dispersion, wherein the spectrum of the frequency-shifted first pulse train is de-tunable by varying the pump power.2. Method of claim 1 , wherein the optically pumped waveguide is a rare-earth-doped large mode area fiber having an effective area of at least 500 μm.3. Method of claim 1 , wherein the optically pumped waveguide is a rare-earth-doped higher order mode fiber having an effective area of at least 2000 μm.4. Method of claim 1 , wherein the optically pumped waveguide is a rare-earth-doped rod-type fiber having an effective area of at least 2000 μm.5. Method of claim 1 , wherein the optically pumped waveguide is a rare-earth-doped micro structured optical fiber having an effective area of at least 500 μm.6. Method of claim 1 , further comprising the step of amplifying at least one of the first pulse train and the second pulse train.7. Method of claim 1 , further comprising the step of superposing the frequency-shifted first pulse train and ...

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Номер записи: 80
03-09-2015 дата публикации

Arbitrary pulse shaping in high peak power fiber lasers

Номер: US20150249316A1
Автор: Doron Barness, Eitan Emanuel Rowen, Eran Inbar, Jacob Lasri
Принадлежит: V-Gen Ltd

Seeder for use with a fiber laser for generating an arbitrary shaped pulse, comprising an amplified spontaneous emission (ASE) source, a spectral filter and an arbitrary waveform generator (AWG) modulator, the ASE source for generating a continuous wave (CW) broadband pulse, the spectral filter being coupled with the ASE source for narrowing the CW broadband pulse, and the AWG modulator being coupled with the spectral filter for shaping the narrowed CW broadband pulse to an arbitrary pulse shape.

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Номер записи: 81
23-07-2020 дата публикации

DIODE-PUMPED SOLID-STATE LASER APPARATUS FOR LASER ANNEALING

Номер: US20200235544A1
Автор: CAPRARA Andrea, HODGSON Norman, Schmidt Kai
Принадлежит: Coherent, Inc.

Laser annealing apparatus includes a plurality of frequency-tripled solid-state lasers, each delivering an output beam of radiation at a wavelength between 340 nm and 360 nm. Each output beam has a beam-quality factor (M) greater of than 50 in one transverse axis and greater than 20 in another transverse axis. The output beams are combined and formed into a line-beam that is projected on a substrate being annealed. Each output beam contributes to the length of the line-beam. 1. Optical apparatus for annealing a layer on a substrate , comprising:{'sup': 2', '2, 'a plurality of frequency-converted repetitively-pulsed solid-state lasers, each thereof delivering an output beam having a wavelength in the ultraviolet region of the electromagnetic spectrum, each output beam having a cross-section characterized by mutually-orthogonal first and second transverse axes, a beam-quality factor Min the first transverse axis greater than about 50, a beam-quality factor Min the second transverse axis greater than about 20, laser pulses having a pulse-energy greater than about 100 millijoules, and a pulse-repetition frequency greater than about 100 hertz; and'}a line-projector arranged to receive the output beams, form the output beams into a line-beam, and project the line-beam onto the layer, the line-beam having a length and a width on the layer.2. The apparatus of claim 1 , wherein the beam-quality factor Min the first transverse axis is greater than about 200.3. The apparatus of claim 1 , wherein each output beam contributes to the entire length of the line-beam.4. The apparatus of claim 1 , wherein each of the frequency-converted repetitively-pulsed solid-state lasers includes a laser-resonator having a gain-element optically pumped by one or more diode-laser arrays arranged to provide a gain volume in the gain-element having first and second dimensions in respectively the first and second transverse axes.5. The apparatus of claim 4 , wherein the first transverse axis ...

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Номер записи: 82
17-09-2015 дата публикации

LASER SYSTEM HAVING SWITCHABLE POWER MODES

Номер: US20150263480A1
Автор: Hodel Michael R., Nemeyer Raymond Adam, Stinson Douglas G., Xuan Rongwei Jason
Принадлежит:

In a method, a laser pump module is set to a first power mode and pump energy is output at a first power level through the activation of a first subset of laser diodes. Laser light is emitted from a gain medium at the first power level in response to absorption of the pump energy. An operator input corresponding to a power mode setting is received. The laser pump module is switched to a second power mode and pump energy is output at a second power level through the activation of a second subset of the laser diodes. Laser light is emitted from the gain medium at the second power level in response to absorption of the pump energy. 120-. (canceled)21. A method comprising: a first power mode, in which the laser pump module is configured to output pump energy at a first power level through activation of a first subset of the laser diodes; and', 'a second power mode, in which the laser pump module is configured to output pump energy at a second power level through activation of a second subset of the laser diodes, wherein the first and second power levels are different;, 'providing a laser pump module comprising a plurality of laser diodes, the laser pump module includingsetting the laser pump module to the first power mode using a controller comprising a processor;outputting pump energy from the laser pump module at the first power level;emitting laser light from a gain medium at the first power level in response to absorption of the pump energy;receiving an operator input corresponding to a power mode setting;switching the laser pump module from the first power mode to the second power mode using the controller in response to receiving an operator input;outputting pump energy from the laser pump module at the second power level;emitting laser light from the gain medium at the second power level in response to the absorption of the pump energy.22. The method of claim 21 , wherein providing a gain medium comprises providing a gain medium comprising a yttrium-aluminum- ...

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Номер записи: 83
17-09-2015 дата публикации

ALGORITHMS FOR RAPID GATING OF SEED SUSPENDABLE PULSED FIBER LASER AMPLIFIERS

Номер: US20150263481A1
Автор: Fanning C. Geoffrey, Kutscha Timothy N.
Принадлежит:

Pulsed fiber lasers that amplify seed laser pulses include pump laser drivers that produce simmer currents during periods in which the seed pulse is suspended, and forward currents associated with steady state pulse amplification. By suitable selection of simmer currents, initiation of a series of seed pulses produces pulse-to-pulse output powers with suitable power variation. 1. A laser system , comprising:a seed laser;a doped fiber situated to receive optical pulses from the seed laser;a pump laser coupled to the doped fiber so as to deliver pump optical radiation to the doped fiber to produce optical gain; anda pulse controller coupled to the seed laser to signal initiation of a series of seed pulses, and to the pump laser so as to switch a pump laser drive current from a simmer current to a forward current upon initiation of the seed laser optical pulses, wherein the simmer current is selected to produce a gain for a first seed laser pulse in the series of seed laser pulses that corresponds to a saturated gain associated with exposure to the series of seed pulses produced with a forward current.2. The laser system of claim 1 , further comprising:a memory that stores simmer current values; andprogrammable logic configured to obtain a simmer current value based on the stored simmer current values.3. The laser system of claim 2 , wherein the programmable logic is configured to obtain the simmer current value based on interpolation using two or more simmer current values stored in the memory.4. The laser system of claim 3 , wherein the programmable logic obtains the simmer current values based on at least one of a pulse repetition frequency claim 3 , a pulse power claim 3 , pulse duration claim 3 , a pulse energy claim 3 , and an average power.5. The laser system of claim 1 , wherein the simmer current is selected so that a first pulse in a pulse sequence has a pulse power that is within ±10% of a steady state pulse power produced with a selected forward current.6. ...

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Номер записи: 84
06-09-2018 дата публикации

Wavelength beam combining laser systems with high beam quality factor

Номер: US20180252929A1
Автор: Bien Chann, Michael Cruz, Parviz Tayebati, Robin Huang, Wang-Long Zhou
Принадлежит: Individual

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.

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Номер записи: 85
15-09-2016 дата публикации

Optical system and method

Номер: US20160268764A1
Автор: Andy STEINMANN, Harald Giessen, Tobias Steinle
Принадлежит: Baden Wuerttemberg Stiftung gGmbH

Optical system and method for the provision of at least one high-frequency modulated light pulse having a pump light source for the provision of high-frequency pump light pulses; an optical resonator having a coupling element for coupling the pump light pulses into the resonator and a decoupling element for decoupling the at least one high-frequency modulated light pulse from the resonator and an optically non-linear frequency conversion medium arranged in the resonator for transforming the pump light pulses in each case into two conversion light pulses and one residual pump light pulse. The resonator comprises a feedback arm for at least one of the two conversion light pulses and/or the residual pump light pulse, in which an optically non-linear feedback medium is arranged for the optical modulation of the at least one conversion light pulse and/or the residual pump light pulse.

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Номер записи: 86
06-08-2020 дата публикации

LASER SYSTEM HAVING A DUAL PULSE-LENGTH REGIME

Номер: US20200251873A1
Автор: Aviad Idan, Ben-Shlomo Albert, Cannon Christopher, Har-Even Yehoram, Manor Yair, Shacham Alon
Принадлежит:

A single loop hardware-based system for producing laser pulses in a microsecond scale operational mode includes a GUI to enable a user to select the operational mode of the system; a laser source for producing one or more laser beam pulses, the laser source being a diode laser pump source module; a DSP which enables and disables a hardware-based FPGA. The FPGA controls the diode pump source module. When a user selects one or more microsecond scale laser sub-pulses on the GUI, the DSP transmits to the FPGA the sub-pulse energy level and the sub-pulse on-time selected by the user on the GUI. A photodetector operatively connected to the hardware-based system measures the power of the laser pulse beam that was transmitted to the photodetector and, in a feedback mode, transmits a feedback signal of that power measurement to the FPGA. The FPGA compares the power of the laser beam measured by the photodetector to the power of the laser beam selected by the user on the GUI. If the power level read by the FPGA is higher than the selected power level, the FGPA decreases the power level to the pumping source module for any subsequent laser pulses; and if the power level read by the FPGA is less than the selected power level, the FGPA increases the power level to the pumping source module for subsequent laser pulses. 117.-. (canceled)18. A method for producing laser pulses with a single loop hardware-based system:the system consisting of a single loop hardware-based device;the method providing the single loop hardware-based system capable of producing laser pulses in a microsecond scale operational mode, the system further comprising:a laser source for producing one or more laser beam pulses, the laser source being a diode laser pump source module controlled by a hardware-based control system;wherein the method further comprises:selecting one or more microsecond scale laser sub-pulses, the control system receiving the sub-pulse energy level and the sub-pulse on-time selected;a ...

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Номер записи: 87
20-09-2018 дата публикации

SOLID-STATE LASER FOR LIDAR SYSTEM

Номер: US20180269646A1
Автор: Campbell Scott R., Eichenholz Jason M., Jaspan Martin A., Martin Lane A., Weed Matthew D., Welford David
Принадлежит:

A lidar system can include a solid-state laser to emit pulses of light. The solid-state laser can include a Q-switched laser having a gain medium and a Q-switch. The lidar system can also include a scanner configured to scan the emitted pulses of light across a field of regard and a receiver configured to detect at least a portion of the scanned pulses of light scattered by a target located a distance from the lidar system. The lidar system can also include a processor configured to determine the distance from the lidar system to the target based at least in part on a round-trip time of flight for an emitted pulse of light to travel from the lidar system to the target and back to the lidar system. 1. A lidar system comprising:a solid-state laser configured to emit pulses of light, wherein the solid-state laser comprises a Q-switched laser comprising a gain medium and a Q-switch;a scanner configured to scan the emitted pulses of light across a field of regard;a receiver configured to detect at least a portion of the scanned pulses of light scattered by a target located a distance from the lidar system; anda processor configured to determine the distance from the lidar system to the target based at least in part on a round-trip time of flight for an emitted pulse of light to travel from the lidar system to the target and back to the lidar system.2. The lidar system of claim 1 , wherein the pulses of light are emitted by the Q-switched laser claim 1 , and the pulses of light have a pulse repetition frequency greater than or equal to 20 kHz.3. The lidar system of claim 1 , wherein the pulses of light are emitted by the Q-switched laser claim 1 , and the pulses of light have optical characteristics comprising:a pulse duration less than or equal to 20 nanoseconds;a duty cycle less than or equal to 1%;a pulse energy greater than or equal to 10 nanojoules; anda peak power greater than or equal to 1 watt.4. The lidar system of claim 1 , wherein the Q-switched laser is an ...

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Номер записи: 88
08-10-2015 дата публикации

REGENERATIVE OPTICAL AMPLIFIER FOR SHORT PULSED LASERS, A LASER SOURCE AND A LASER WORKSTATION

Номер: US20150288134A1
Автор: Danielius Romualdas
Принадлежит: UAB MGF SVIESOS KONVERSIJA

This invention provides a solution for operating a regenerative amplifier using a single electro-optical device, such as a Pockels cell. An efficient cavity geometry of a regenerative amplifier is provided for enabling pulse selection, coupling and releasing to an output by operating a single Pockels cell unit placed essentially in the middle of the optical cavity, between two polarizers, whereas a first polarizer is used for release of an amplified pulse and a second polarizer is used for injection of seed pulses and release of at least one of waste amplified pulses and seed pulses. One side of the cavity, with respect to the location of said Pockels cell, includes an empty space, whereas the other side is provided with a gain medium, which is pumped by a pump source. The regenerative amplifier of such optical design is both efficient and cost effective. The single electro-optical unit works both as the control unit for operating the regenerative amplifier and as an output pulse picker unit. 1. A regenerative optical amplifier comprising:an optical cavity defined by two end mirrors, andan electro-optical unit arranged to change a polarization state of an incident beam upon application of an electric signal,wherein the electro-optical unit is located essentially in the middle of the optical cavitywherein a length of each of a first and a second optical path, extending from the electro-optical unit towards the end mirrors is long enough so that the electro optical unit is able to fully transition from one state to another while a pulse of light is propagating in either of the first and the second optical paths, andwherein the regenerative optical amplifier is arranged in such a manner that, depending on a timing of a control signal of the electro-optical unit, amplified pulses are directed towards one of two outputs of the regenerative optical amplifier, located on opposite sides with respect to the electro-optical unit.2. The regenerative optical amplifier according ...

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Номер записи: 89
29-09-2016 дата публикации

NANOSECOND PULSE LASER DEVICE AND ALTERNATE LASER WAVELENGTH OUTPUT METHOD THEREOF

Номер: US20160285231A1
Автор: KIM Changseok, LEE Eun-Seong, Lee Jae Yong, Lee Sang-Won, LIM Gukbin
Принадлежит:

The present invention relates to a nanosecond pulse laser device. The nanosecond pulse laser device of the present invention comprises: a light source which outputs a nanosecond pulse laser beam; a lens which focuses the laser beam; a Raman shift optical fiber which generates pulse lasers corresponding to a plurality of wavelengths through stimulated Raman scattering of the focused laser beam; a wavelength divider which divides, from among the pulse lasers, the pulse lasers of a predetermined wavelength; an optical switch which selects the pulse lasers outputted from the wavelength divider to mutually alternate the wavelengths in response to a switch control signal which is applied from the outside; and a wavelength combiner which combines and outputs the pulse lasers whose wavelengths are alternatively outputted from the switch. 1. A nanosecond pulse laser device comprising:a light source configured to output laser light of a nanosecond pulse;a lens configured to collect the laser light;a Raman shift optical fiber configured to generate pulse laser lights corresponding to a plurality of wavelengths through stimulated Raman scattering from the collected laser light;a wavelength separator configured to separate pulse laser lights of prescribed wavelengths from among the pulse laser lights;an optical switch configured to select pulse laser lights of which wavelengths are mutually alternated from among the pulse laser lights output from the wavelength separator in response to a switch control signal applied from an outside; anda wavelength coupler configured to couple the pulse laser lights of which wavelengths are alternately output from the optical switch and output the coupled pulse laser light.2. The nanosecond pulse laser device of claim 1 , wherein the laser light is continuous coherent light.3. The nanosecond pulse laser device of further comprising:an isolator positioned between the light source and the lens and configured to block retro-reflection of the laser ...

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Номер записи: 90
28-09-2017 дата публикации

SOLID-STATE LASER SYSTEM

Номер: US20170279241A1
Автор: Onose Takashi, Wakabayashi Osamu
Принадлежит: Gigaphoton Inc.

A solid-state laser system may include first and second solid-state laser units, a wavelength conversion system, an optical shutter, and a controller. The first solid-state laser unit and the second solid-state laser unit may output first pulsed laser light with a first wavelength and second pulsed laser light with a second wavelength, respectively. The controller may perform first control and second control. The first control may cause the first and second pulsed laser light to enter the wavelength conversion system at a substantially coincidental timing, thereby causing the wavelength conversion system to output third pulsed laser light with a third wavelength converted from the first wavelength and the second wavelength, and the second control may prevent the first and second pulsed laser light from entering the wavelength conversion system at the coincidental timing, thereby preventing the wavelength conversion system from outputting the third pulsed laser light. 1. A solid-state laser system , comprising:a first solid-state laser unit configured to output first pulsed laser light with a first wavelength;a second solid-state laser unit configured to output second pulsed laser light with a second wavelength;a wavelength conversion system where the first pulsed laser light and the second pulsed laser light enter;an optical shutter provided in an optical path of one or both of the first pulsed laser light and the second pulsed laser light; anda controller configured to cause the first pulsed laser light and the second pulsed laser light to be continuously outputted from the first solid-state laser unit and the second solid-state laser unit, respectively, and perform first control in which the optical shutter is opened while a burst signal from an external unit is on and second control in which the optical shutter is closed while the burst signal is off, the first control causing the first pulsed laser light and the second pulsed laser light to enter the wavelength ...

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Номер записи: 91
27-09-2018 дата публикации

Sub-nanosecond broad spectrum generating laser system

Номер: US20180278006A1
Автор: Igor Moskalev, Michael MIROV, Sergey Vasilyev, Valentin Gapontsev
Принадлежит: IPG Photonics Corp

The present invention provides systems and methods for producing short laser pulses that are amplified and spectrally broadened in a bulk gain media. The bulk material, having laser gain and nonlinear properties, is concurrently exposed to an optical pump input and a seed input, the pump power being sufficient to amplify and spectrally broaden the seed pulse.

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Номер записи: 92
27-09-2018 дата публикации

LASER LIGHT-SOURCE APPARATUS AND LASER PULSE LIGHT GENERATING METHOD

Номер: US20180278010A1
Автор: MURAYAMA Shinichi, OKADA Joji, OKUYAMA Daisuke, ORII Yosuke
Принадлежит: SPECTRONIX CORPORATION

A laser light-source apparatus includes: a fiber amplifier and a solid-state amplifier to amplify pulse light output from a seed light source serving as a first light source; a nonlinear optical element to perform wavelength conversion on the pulse light output from the solid-state amplifier; an optical switching element to permit or stop propagation of the pulse light from the fiber amplifier to the solid-state amplifier; a second light source disposed on an upstream side of the solid-state amplifier and is configured to output laser light able to be combined with the pulse light output from the seed light source; and a control unit to control the optical switching element in such a manner that the propagation of light is stopped and to perform control in such a manner that the second light source oscillates, at least in an output period of the pulse light from the seed light source. 115-. (canceled)16. A laser light-source apparatus comprising:a first light source configured to output pulse light based on gain switching;a fiber amplifier configured to amplify the pulse light output from the first light source;a solid state amplifier configured to amplify the pulse light output from the fiber amplifier;a nonlinear optical element configured to perform wavelength conversion on the pulse light output from the solid state amplifier and output the resultant pulse light;a second light source that is provided on an upstream side of the solid state amplifier and is configured to output laser light that is able to be combined with the pulse light output from the first light source; anda control unit configured to achieve in an output permitted state in which the nonlinear optical element outputs the pulse light, an output stopped state in which the nonlinear optical element stops outputting the pulse light by stopping propagation of the pulse light from the first light source to the solid state amplifier, with power of excitation light to the solid state amplifier ...

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Номер записи: 93
04-10-2018 дата публикации

LASER DEVICE AND METHOD FOR DRIVING LASER DEVICE

Номер: US20180280086A1
Автор: Lee Hee Chul
Принадлежит:

A laser device according to the present invention may comprise: a pumping laser supply unit for emitting a pumping laser having a nano-second pulse width; and a laser output unit disposed at one side of the pumping laser supply unit and generating an output laser which is pumped by the pumping laser to have a nano-second pulse width corresponding to the pulse width of the pumping laser. 1. A laser apparatus , comprising:a pumping laser supply unit emitting a pumping laser having a nano-second pulse width; anda laser output unit disposed on one side of the pumping laser supply unit and generating an output laser pumped by the pumping laser to have a nano-second pulse width corresponding to the pulse width of the pumping laser.2. The laser apparatus of claim 1 , wherein the laser output unit comprises an output laser medium absorbing the pumping laser and generating the output laser having a wavelength different from a wavelength of the pumping laser.3. The laser apparatus of claim 2 , wherein the output laser medium comprises Er:YAG.4. The laser apparatus of claim 2 , wherein the laser output unit comprises:a total reflection mirror disposed on one side of the output laser medium, transmitting the pumping laser toward the output laser medium, and reflecting the output laser oscillated by the output laser medium; andan output mirror disposed opposite the total reflection mirror on the other side of the output laser medium and partially reflecting or transmitting the output laser oscillated by the output laser medium.5. The laser apparatus of claim 2 , wherein the pumping laser supplied to the laser output unit has a wavelength of 650 nm.6. The laser apparatus of claim 3 , wherein the output laser emitted by the laser output unit has a wavelength of 2940 nm.7. The laser apparatus of claim 1 , wherein the pumping laser supply unit comprises a dye laser source generating the pumping laser.8. The laser apparatus of claim 7 , wherein:the pumping laser supply unit further ...

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Номер записи: 94
04-10-2018 дата публикации

Modulation suppression in fiber lasers and associated devices

Номер: US20180287330A1
Автор: Andrea Arcangeli, Mihamed Hammouda
Принадлежит: Datalogic IP Tech SRL

A system and method for an active Q-switched fiber laser cavity may include a pump source for emitting a laser beam at a wavelength along an optical path including an active optical medium. A modulation device may be configured to introduce tunable losses into the optical path. The tunable losses may be achieved through modulation of the transmissivity of an optical element within the optical path, the modulation of said optical element being performed over (i) a first period of time in which a cavity Q curve increases from a first percentage value to a second percentage value of a maximum Q value and (ii) a second period of time in which the cavity Q curve increases from a third percentage value to a fourth percentage value of the maximum Q value. The cavity Q curve may non-linearly and smoothly transition between (i) the first and second percentage values and (ii) the third and fourth percentage values.

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Номер записи: 95
13-10-2016 дата публикации

Solid-state laser system

Номер: US20160301184A1
Автор: George Williams
Принадлежит: Voxtel Inc

A method of operating a q-switch RE,XAB laser includes: providing a pump bias current to a pump source, the pump source directed to an RE:XAB gain medium, the RE:XAB gain medium within a resonator cavity, where X is selected from Ca, Lu, Yb, Nd, Sm, Eu, Gd, Ga, Tb, Dy, Ho, Er, and where RE is selected from Lu, Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Pr, Tm, Cr, Ho, with a bias current level below a lasing threshold of the RE:XAB gain medium; providing a pump pulse to the gain medium, the pump pulse of the lasing threshold of the RE:XAB gain medium, the pump pulse causing the RE:XAB gain medium to emit a laser pulse; and reducing the pump bias current to at least below the gain medium lasing threshold, the combination of the pump bias, the pump pulse, and the pump reduction having a current profile.

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Номер записи: 96
13-10-2016 дата публикации

QUASI-CONTINUOUS BURST-MODE LASER

Номер: US20160301186A1
Автор: Gord James R., Meyer Terrence R., Roy Sukesh, Slipchenko Mikhail N.
Принадлежит:

A high-energy, high-power, burst-mode laser is disclosed. The laser comprises a master oscillator, which generates a signal. The signal may be a continuous signal or a pulsed signal. The master oscillator optically couples to a pulse picker that creates a train of pulses from the signal, and the spacing between the pulses of the train of pulses ranges from ten nanoseconds to one millisecond. The pulse picker is optically coupled to a first diode-pumped amplifier that amplifies the train of pulses to create a first amplified pulse train. 1. A burst-mode laser comprising:a master oscillator, which generates a signal;a pulse picker optically coupled to the master oscillator, wherein the pulse picker creates a train of pulses from the signal, wherein the spacing between the pulses of the train of pulses ranges from ten nanoseconds to one millisecond; anda first diode-pumped amplifier optically coupled to the pulse-picker, wherein the first diode-pumped amplifier amplifies the train of pulses to create a first amplified pulse train.2. The burst-mode laser of claim 1 , wherein the master oscillator generates a continuous signal.3. The burst-mode laser of claim 1 , wherein the master oscillator generates a pulsed signal.4. The burst-mode laser of claim 1 , wherein the master oscillator includes a fiber laser.5. The burst-mode laser of claim 1 , wherein:the signal generated by the master oscillator includes a wavelength; andthe burst-mode laser further includes a wavelength-tuning module that receives the first amplified pulse train and alters the wavelength of the first amplified pulse train.6. The burst-mode laser of claim 1 , wherein the pulse picker generates a pulse of the train of pulses that is 13 nanoseconds wide and has 10 microjoules of energy.7. The burst-mode laser of claim 1 , wherein the pulse picker includes a fiber-coupled electro-optic modulator.8. The burst-mode laser of claim 7 , wherein the electro-optic modulator includes an optic isolator and is ...

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Номер записи: 97
19-09-2019 дата публикации

LASER PROCESSING SYSTEM AND LASER PROCESSING METHOD

Номер: US20190283177A1
Автор: KAKIZAKI Kouji, Wakabayashi Osamu
Принадлежит: Gigaphoton Inc.

A laser processing system includes a wavelength tunable laser apparatus capable of changing the wavelength of pulsed laser light to be outputted, an optical system irradiating a workpiece with the pulsed laser light, a reference wavelength acquisition section acquiring a reference wavelength corresponding to photon absorption according to the material of the workpiece, a laser processing controller controlling the wavelength tunable laser apparatus to perform preprocessing before final processing performed on the workpiece, changes the wavelength of the pulsed laser light over a predetermined range containing the reference wavelength, and performs wavelength search preprocessing at a plurality of wavelengths, a processed state measurer measuring a processed state on a wavelength basis achieved by the wavelength search preprocessing performed at the plurality of wavelengths, and an optimum wavelength determination section assessing the processed state on a wavelength basis to determine an optimum wavelength used in the final processing. 1. A laser processing system that irradiates a workpiece with pulsed laser light to perform laser processing on the workpiece , the laser processing system comprising:A. a wavelength tunable laser apparatus configured to output the pulsed laser light and be capable of changing a wavelength of the pulsed laser light;B. an optical system configured to irradiate the workpiece with the pulsed laser light outputted from the wavelength tunable laser apparatus;C. a reference wavelength acquisition section configured to acquire a reference wavelength corresponding to photon absorption according to a material of the workpiece;D. a laser processing controller configured to control the wavelength tunable laser apparatus to perform preprocessing before final processing is performed on the workpiece, change the wavelength of the pulsed laser light outputted from the wavelength tunable laser apparatus over a predetermined range containing the ...

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Номер записи: 98
26-09-2019 дата публикации

Drive unit and light-emitting device

Номер: US20190296518A1
Автор: Masashi Nakamura, Osamu Maeda, Satoru Fushimi, Yuji Furushima
Принадлежит: Sony Semiconductor Solutions Corp

In a drive unit according to an embodiment of the present disclosure, in each of a plurality of current pulses, a rising crest value is the largest, and after the rising, the crest value is damped. Further, a rising crest value of a pulse of an n+1-th wave is smaller than a rising crest value of a pulse of an n-th wave. Furthermore, rising crest values of the current pulses of a second wave and waves after the second wave are determined by a mathematical function expressed as an electric potential change caused by ON-OFF of an RC time constant circuit that is single-end grounded. Moreover, in the mathematical function, a time constant at an OFF time is larger than a time constant at an ON time.

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Номер записи: 99
05-11-2015 дата публикации

Fiber laser device

Номер: US20150318660A1
Автор: Michihiro Nakai, Yasuhiro Oba
Принадлежит: Fujikura Ltd

In a case where the period from the input of the output suspension instruction to the next output instruction is shorter than the fixed period of time, the seed laser light source and the pumping light source are in a pre-pumped state during the period from the end of the output state to the start of the next output state. In a case where the period from the input of the output suspension instruction to the next output instruction is longer than the fixed period of time, the seed laser light source and the pumping light source are in the pre-pumped state only for the fixed period of time from the input of the output instruction.

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Номер записи: 100