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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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Применить Всего найдено 4377. Отображено 100.

19-01-2012 дата публикации

Optical amplifier and transmission loss measurement method

Номер: US20120013975A1

Автор: Miki Onaka

Принадлежит: Fujitsu Ltd

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

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Номер записи: 1

23-02-2012 дата публикации

Optical amplification device, communication system, and amplification method

Номер: US20120045212A1

Автор: Tomoaki Takeyama

Принадлежит: Fujitsu Ltd

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

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Номер записи: 2

21-06-2012 дата публикации

Distribution system for optical reference

Номер: US20120154062A1

Автор: Matthew T. Cashen, Steven R. Wilkinson, Todd O. Clatterbuck

Принадлежит: Raytheon Co

A system for distributing a reference oscillator signal includes a clock having a reference oscillator and a femtosecond laser stabilized by the reference oscillator. The system also includes at least one beamsplitter configured to split the femtosecond laser. The system further includes one or more remote nodes that are spaced from the clock. The remote nodes are configured to generate reference signals based on the split femtosecond laser.

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Номер записи: 3

03-01-2013 дата публикации

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

Номер: US20130003763A1

Автор: Nam-Soo Myung, Seung-Hwan Kim

Принадлежит: Electronics and Telecommunications Research Institute ETRI

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

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Номер записи: 4

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: 5

21-02-2013 дата публикации

Frequency-chirped semiconductor diode laser phase-locked optical system

Номер: US20130044770A1

Автор: George Rakuljic

Принадлежит: George Rakuljic

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

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Номер записи: 6

14-03-2013 дата публикации

Method and Apparatus for Suppression of Stimulated Brillouin Scattering Using Polarization Control with A Birefringent Delay Element

Номер: US20130063808A1

Автор: Joshua E. Rothenberg

Принадлежит: Northrop Grumman Systems Corp

A method and apparatus for suppression of stimulated Brillouin scattering (SBS) includes a master oscillator (MO) that generates a beam; a birefringent element that receives and transmits the beam, wherein the beam is transmitted with a transmission delay between two orthogonal axes; a polarization controller that receives the beam and transmits the beam with a desired polarization; a fiber amplifier that receives the beam, amplifies the beam, and transmits a beam; a compensating birefringent element that receives the beam, approximately removes the transmission delay between the two axes of the beam, and transmits an output beam; and a polarization detector that detects the output beam's polarization and provides feedback to the polarization controller to ensure that the polarization of the output beam is approximately equal to a desired output polarization, so as to reduce SBS.

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Номер записи: 7

28-03-2013 дата публикации

High-Power, Phase-Locked, Laser Arrays

Номер: US20130077645A1

Автор: Volodin Boris Leonidovich

Принадлежит: PD-LD, INC.

High-power, phased-locked, laser arrays as disclosed herein utilize a system of optical elements that may be external to the laser oscillator array. Such an external optical system may achieve mutually coherent operation of all the emitters in a laser array, and coherent combination of the output of all the lasers in the array into a single beam. Such an “external gain harness” system may include: an optical lens/mirror system that mixes the output of all the emitters in the array; a holographic optical element that combines the output of all the lasers in the array, and an output coupler that selects a single path for the combined output and also selects a common operating frequency for all the coupled gain regions. 12.-. (canceled)3. A method for producing mutually-coherent operation of a plurality of light emitters , each of the emitters outputting a respective power , the method comprising:combining respective beams received from each of the plurality of emitters to form a composite beam containing a respective contribution from each of the emitters; andfeeding back to all of the emitters at least a portion of the composite beam, the portion having a selected wavelength and containing a respective contribution from each of the emitters,wherein mutually coherent operation of all of the emitters is achieved with a phase difference that results in a coherent output beam from the system that effectively combines the powers from each of the emitters.4. The method of claim 3 , wherein mutually coherent operation of the plurality of emitters is achieved such that each of the emitters lases at a selected wavelength.5. The method of claim 4 , wherein mutually coherent operation of the plurality of emitters is achieved such that each of the emitters lases at the selected wavelength with a phase difference that results in the coherent output beam from the system.6. The method of claim 3 , wherein each of the emitters outputs a respective power and brightness claim 3 , ...

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Номер записи: 8

25-04-2013 дата публикации

DEVICE FOR PRODUCING HIGH FREQUENCIES BY MEANS OF LIGHT FREQUENCY BEATING

Номер: US20130100973A1

Автор: "Loas Goulchen", Alouini Mehdi, Bondu François, Brunel Marc, Romanelli Marco, Vallet Marc

Принадлежит: Centre National De La Recherche Scientifique

In the field of the production of very high frequencies, for example from 1 gigahertz to several terahertz, by beating the frequencies of two laser beams together, a device includes a resonant optical cavity having very stable dimensions receiving the beams, with for each beam, an interrogation device of the resonant cavity supplying an electrical signal representing the difference in frequency between the light frequency of the beam and a resonance frequency of the resonant cavity. The frequency of each beam is servo controlled to minimize the frequency difference observed. The laser beams are produced by a dual-frequency laser producing two beams of different frequencies and orthogonal polarizations. A polarization separator is used for separate servo control of the beams according to polarization, and a polarizer is placed behind a main output of the resonant cavity producing an electromagnetic beam mixing the two polarizations and amplitude-modulated at the beat frequency. 2. The device as claimed in claim 1 , wherein the two laser beams are produced by a dual-frequency laser producing two beams with the same axis having different frequencies and orthogonal polarizations.3. The device as claimed in claim 1 , wherein the polarizer is a polarizer claim 1 , preferably at 45° claim 1 , combining the two beams in a single polarization in balanced proportions.4. The device as claimed in claim 1 , wherein the polarizer is a polarizer combining the two beams in a single polarization in different proportions.5. The device as claimed in claim 1 , wherein the output of the device is located downstream from a transmission output of the resonant cavity.6. The device as claimed in claim 1 , wherein the output of the device is located upstream from the resonant cavity.7. The device as claimed in claim 1 , wherein the resonant cavity comprises a secondary reflected output claim 1 , and in that the polarization separator receives a fraction of the radiation from the secondary ...

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Номер записи: 9

23-05-2013 дата публикации

Laser oscillation apparatus

Номер: US20130128906A1

Автор: Junji Urakawa, Yosuke Honda

Принадлежит: Inter University Research Institute Corp High Energy Accelerator Research Organization

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

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Номер записи: 10

13-06-2013 дата публикации

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

Номер: US20130148193A1

Автор: Joshua Elliott Rothenberg

Принадлежит: Northrop Grumman Systems Corp

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

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Номер записи: 11

04-07-2013 дата публикации

LASER BEAM ENERGY STABILIZING APPARATUS, PULSE TEMPORAL WAVEFORM CONTROL APPARATUS, LASER BEAM ENERGY STABILIZING METHOD, AND PULSE TEMPORAL WAVEFORM CONTROL METHOD

Номер: US20130170513A1

Автор: Matsuo Shigeki

Принадлежит: THE UNIVERSITY OF TOKUSHIMA

The present invention provides a laser beam control apparatus including: beam optical systems and for dividing a laser beam into a principal beam P and an auxiliary beam S and then for crossing the principal beam P and the auxiliary beam S; polarizing devices and for converting the laser beam before the division process into a linearly-polarized beam or converting the laser beams after the division process into linearly-polarized beams; a polarization direction change element for changing the polarization direction of either one or both of the principal beam P and the auxiliary beam S; an optical gate element provided at the intersection of the principal beam P and the auxiliary beam S and made of a material that exhibits the optical Kerr effect; and a polarization filter for taking out from the principal beam P which has passed through the optical gate element only a beam polarized in a predetermined direction. 1. A laser beam energy stabilizing apparatus , comprising:a) a beam optical system for dividing a linearly-polarized incident laser beam into a principal beam and an auxiliary beam and then for crossing the principal beam and the auxiliary beam;b) a polarization direction change element for changing a polarization direction of either one or both of the principal beam and the auxiliary beam;c) an optical gate element provided at an intersection of the principal beam and the auxiliary beam and made of a material that exhibits an optical Kerr effect; andd) a polarization filter for taking out from the principal beam which has passed through the optical gate element only a beam polarized in a predetermined direction.2. A laser beam energy stabilizing apparatus , comprising:a) an incident beam convertor for converting an incident laser beam into a linearly-polarized beam;b) a beam optical system for dividing the incident laser beam which has been converted into a linearly-polarized beam into a principal beam and an auxiliary beam and then for crossing the ...

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Номер записи: 12

22-08-2013 дата публикации

WIDEBAND TUNABLE LASER LINE-WIDTH REDUCTION

Номер: US20130215919A1

Автор: AFLATOUNI Firooz, Hashemi Hossein

Принадлежит: UNIVERSITY OF SOUTHERN CALIFORNIA

Various examples of feed-forward systems that reduce phase noise in a laser field generated by a laser. These include feed-forward systems that utilize phase and/or frequency discriminators, filters, integrators, voltage controlled oscillators (VCOs), current controlled oscillators (CCOs), phase modulators, and/or amplitude modulators. It also includes systems that use both feed-forward and feedback phase noise reduction systems, tunable semiconductor lasers, and multiple, sequential feed-forward systems. 1. A laser phase noise reduction system for reducing phase noise in a laser field generated by a laser comprising:a phase-frequency discriminator configured to receive a first portion of the laser field and to generate an electrical output that includes information about the phase or frequency of the laser field;an electrical filter configured to receive the electrical output of the phase-frequency discriminator and to generate an electrical signal that represents the electrical output of the phase-frequency discriminator filtered by a filtering criteria; anda phase modulator configured to receive a second portion of the laser field different from the first portion of the laser field and to modulate the second portion of the laser field with the electrical signal from the electrical filter, thereby reducing phase noise in the second portion of the laser field.2. The laser phase noise reduction system of wherein the phase-frequency discriminator is resonator-based.3. The laser phase noise reduction system of wherein the resonator-based phase-frequency discriminator includes a resonator coupled to a waveguide.4. The laser phase noise reduction system of further comprising a feedback laser phase noise reduction system configured to reduce the phase noise in the laser field.5. A laser phase noise reduction system for reducing phase noise in a laser field generated by a laser comprising:a frequency discriminator configured to receive a first portion of the laser field ...

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Номер записи: 13

05-09-2013 дата публикации

BEAM DIAGNOSTICS AND FEEDBACK METHOD AND SYSTEM FOR SPECTRALLY BEAM-COMBINED LASERS

Номер: US20130230065A1

Автор: HONEA ERIC C., Jander Donald R., Madasamy Pratheepan, Yilmaz Tolga

Принадлежит: LOCKHEED MARTIN CORPORATION

Apparatus and method for control of lasers (which use an array of optical gain fibers) in order to improve spectrally beam-combined (SBC) laser beam quality along the plane of the SBC fiber array via spectral-to-spatial mapping of a portion of the spectrally beam-combined laser beams, detection of optical power in each of the spatially dispersed beams and feedback control of the lasers for wavelength-drift correction. The apparatus includes a diffractive element; a source of a plurality of substantially monochromatic light beams directed from different angles to a single location on the diffractive element, wherein the diffractive element spectrally combines the plurality of light beams into a single beam. A controller adjusts characteristics of the light beams if one of the light beams has become misadjusted. In some embodiments, the controller adjusts the wavelength tuning of the respective fiber laser. 1. An apparatus comprising:a first plurality of lasers, including a first laser and a second laser, wherein each one of the first plurality of lasers generates an optical beam which has a different wavelength that is controllably tunable;a first beam combiner that combines the optical beams of the first plurality of lasers into a combined beam that contains each of the different wavelengths from the first plurality of lasers;a spectral-to-spatial wavelength-separation device, separate from the first beam combiner, that performs a spectral-to-spatial mapping of the different wavelengths of a portion of the combined beam to a first plurality of distinct spatial locations;a detection element that detects optical power at each of the first plurality of distinct spatial locations, and that generates a signal based on the optical power at each of the first plurality of spatial locations; andcontrol electronics that maximizes the signal from each of the first plurality of spatial locations by tuning the wavelength of a corresponding one of the plurality of lasers.2. The ...

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Номер записи: 14

03-10-2013 дата публикации

TUNABLE OPTO-ELECTRONIC OSCILLATOR HAVING OPTICAL RESONATOR FILTER OPERATING AT SELECTED MODULATION SIDEBAND

Номер: US20130259072A1

Автор: Eliyahu Danny, Ilchenko Vladimir, Maleki Lute, Matsko Andrey, Savchenkov Anatoliy, Seidel David

Принадлежит: OEwaves, Inc.

Opto-electronic oscillator (OEO) devices include an optical resonator filter to block the strong laser light at the laser carrier frequency from entering the optical resonator filter and to select one of the weak modulation sidebands, which is in resonance with the optical resonator filter, to be coupled into the optical resonator filter. The laser light at the laser carrier frequency and other modulation sidebands bypass the optical resonator filter to reach a fast photodetector. The laser light in the selected modulation sideband in the optical resonator filter is then coupled out to mix with the laser light at the laser carrier frequency and other modulation sidebands at the fast photodetector to produce the detector output as the input to the electrical part of the opto-electronic loop to produce the OEO oscillation. 1. An opto-electronic oscillator device , comprising:a laser to emit laser light at a laser carrier frequency;an optical modulator that receives the laser light from the laser and modulates the received laser light, under a control of and in response to a modulation control signal, to produce modulated laser light having spectral components at the laser carrier frequency and modulation sidebands at frequencies different from the laser carrier frequency;to an optical resonator filter positioned to receive the modulated laser light at a selected modulation sideband in resonance with an optical mode of the optical resonator filter to selectively receive and output filtered laser light at the selected modulation sideband while blocking laser light at the laser carrier frequency and other modulation sidebands from entering the optical resonator filter;an optical detector coupled to receive the filtered laser light at the selected modulation sideband and the laser light at the laser carrier frequency and other modulation sidebands to produce an electrical detector signal; anda feedback electronic circuit coupled between the optical detector and the ...

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Номер записи: 15

17-10-2013 дата публикации

STABILIZED FEMTOSECOND PULSED LASER AND STABILIZATION METHOD

Номер: US20130272328A1

Автор: Comte Michel, Gobert Olivier, Hergott Jean-Francois, Paul Pierre-Mary

Принадлежит:

The present invention relates to a high-power femtosecond pulsed laser, the laser including: a source able to generate a train of input laser pulses having an envelope frequency and a carrier frequency; a chirped pulse amplification unit; and, a unit for controlling the phase drift between the envelope frequency and the carrier frequency of the output laser pulses. According to the invention, the unit for controlling the phase drift between the envelope frequency and the carrier frequency includes electro-optical phase-modulation unit that are placed on an optical path of the chirped pulse amplification unit in order to stabilize the phase drift between the envelope frequency and the carrier frequency of the output laser pulses as a function of time. 1. A high-energy femtosecond pulsed laser , stabilized as regards the phasedrift between envelope frequency and carrier frequency , said laser comprising:{'b': 1', '1', '10', '60', '50, 'a source () of laser pulses to be amplified, said source () being adapted to generate a train of input laser pulses () having an envelope frequency () and a carrier frequency ();'}{'b': 2', '10', '3', '3', '3', '20', '4', '30, 'i': a', 'b, 'chirped pulse amplification means comprising stretching means () adapted to time stretch the input laser pulses (), optical amplification means (, , ) adapted to amplify the stretched laser pulses () and compression means () adapted to time compress the amplified laser pulses (), and'}means for controlling the phase drift between envelope frequency and carrier frequency of the output laser pulses,wherein:{'b': '40', 'said means for controlling the phasedrift between envelope frequency and carrier frequency comprise electro-optical modulation means placed on an optical path of the laser pulses so as to stabilize the phase drift between envelope frequency and carrier frequency of the output laser pulses () as a function of time.'}25. The ultrashort pulsed laser according to claim 1 , wherein said ...

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Номер записи: 16

26-12-2013 дата публикации

HIGH PEAK POWER OPTICAL AMPLIFIER

Номер: US20130342895A1

Автор: AUGST Steven J., Chann Bien, Fan Tso Yee, Sanchez-Rubio Antonio

Принадлежит: Massachusetts Institute of Technology

A method and apparatus for providing a high peak power optical beam. The method includes interleaving pulse trains of different wavelengths and spatially and temporally overlapping the different wavelengths to produce an amplified output beam with very high peak power. 1. An optical amplifier system comprising:a plurality of seed laser sources each configured to generate an optical beam having a unique wavelength to provide a plurality of wavelengths;a wavelength division multiplexer configured to spatially overlap the plurality of wavelengths to form a first beam;an amplitude modulator configured to receive the first beam and to amplitude modulate the first beam to form a modulated beam;a wavelength division demultiplexer configured to receive the modulated beam and to spatially spectrally disperse the modulated beam into a plurality of modulated wavelengths;first delay optics optically coupled to the wavelength division multiplexer and configured to receive and uniquely delay each wavelength of the plurality of modulated wavelengths to provide a waveform comprising a first time series of the plurality of modulated wavelengths;an amplifier configured to receive the waveform and to amplify each wavelength of the plurality of modulated wavelengths to provide an amplified waveform comprising a second time series of a corresponding plurality of amplified modulated wavelengths; andsecond delay optics configured to temporally overlap the plurality of amplified modulated wavelengths to provide an output beam.2. The optical amplifier system as claimed in claim 1 , further comprising dispersive optics optically coupled between the amplifier and the second delay optics and configured to receive and spatially spectrally disperse the amplified modulated waveform.3. The optical amplifier system as claimed in claim 2 , wherein the dispersive optics comprise at least one of a wavelength division de-multiplexer claim 2 , a diffraction grating claim 2 , a beam splitter claim 2 , ...

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Номер записи: 17

26-12-2013 дата публикации

Method and laser oscillator for the generation of a laser beam

Номер: US20130342896A1

Автор: Agnés Desfarges-Berthellemot, Alain Barthelemy, Brigitte Serreault, Bruno Esmiller, David Sabourdy, Jean-Eucher Montagne, Julien Guillot, Vincent Kermene

Принадлежит: Compagnie Industriel des Lasers CILAS SA

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

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Номер записи: 18

13-02-2014 дата публикации

CONTROLLER WHICH CONTROLS A VARIABLE OPTICAL ATTENUATOR TO CONTROL THE POWER LEVEL OF A WAVELENGTH-MULTIPLEXED OPTICAL SIGNAL WHEN THE NUMBER OF CHANNELS ARE VARIED

Номер: US20140043675A1

Автор: Kinoshita Susumu, SUGAYA Yasushi

Принадлежит: FUJITSU LIMITED

An optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength division multiplexed optical signal; a variable optical attenuator which controls a level of the first optical amplifier amplified wavelength division multiplexed optical signal and outputs the controlled wavelength division multiplexed optical signal; a second optical amplifier which amplifies the controlled wavelength division multiplexed optical signal and outputs the amplified, controlled wavelength division multiplexed optical signal; and a controller which controls the wavelength division multiplexed optical signal to be amplified with a constant gain. 1. An apparatus comprising:an optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal, the optical amplifier including:a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength division multiplexed optical signal,a variable optical attenuator which controls a level of the first optical amplifier amplified wavelength division multiplexed optical signal and outputs the controlled wavelength division multiplexed optical signal,a second optical amplifier which amplifies the controlled wavelength division multiplexed optical signal and outputs the amplified, controlled wavelength division multiplexed optical signal, anda controller which controls the wavelength division multiplexed optical signal to be amplified with a constant gain.2. An apparatus as in claim 1 , wherein the optical amplifier ...

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Номер записи: 19

06-03-2014 дата публикации

6x28-Gbaud Few-Mode Fiber Recirculating Loop Transmission with Gain-Equalized Inline Few-Mode Fiber Amplifier

Номер: US20140063592A1

Автор: Ip Ezra

Принадлежит: NEC Laboratories America, Inc.

Disclosed herein are methods, structures and systems for few-mode fiber (FMF) transmission including an optical amplifier exhibiting modal gain control suitable for such transmission in which higher order modes are amplified. An exemplary evaluation system is described and results presented. 1. A multi-mode fiber amplifier with tunable modal gain comprising:an amplifying medium operable to support the propagation of multiple modes at a signal wavelength;a pump laser connected to a mode multiplexer;wavelength division multiplexed (WDM) combiners for multiplexing or demultiplexing the signal with the pump;a gain flattening filter for equalizing the amplifiers gain versus wavelength characteristic; andisolators for preventing back-reflections such that spurious lasing is prevented.2. The multi-mode fiber amplifier of wherein the amplifying medium comprises a few-mode fiber exhibiting a refractive index profile such that the propagation of multiple signal modes is effected claim 1 , and having a dopant concentration such that mode-dependent gain is controlled.3. The multi-mode fiber amplifier of wherein the pump laser operates at any wavelength corresponding to an absorption wavelength of the dopant species employed in the amplifying medium.4. The multi-mode fiber amplifier of wherein the dopant species is Er and the wavelength is one selected from the group consisting of 980 nm and 1480 nm.5. The multi-mode fiber amplifier of wherein the isolators are free-space isolators.6. The multi-mode fiber amplifier of wherein the gain flattening filter is a grating or spatial hologram having a transmittance characteristic such that the overall device exhibits a flat gain profile over a usable signal band.7. The multi-mode fiber amplifier of wherein gain flattening filter is a grating based upon a multimode fiber supporting at least as many modes as that exhibited by an input signal.8. The multi-mode fiber amplifier of wherein the gain flattening filter is a fiber-based grating ...

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Номер записи: 20

05-01-2017 дата публикации

APPARATUS

Номер: US20170005450A1

Автор: Yamamoto Hiroshi

Принадлежит:

Provided is an apparatus for acquiring object information, the apparatus including: first and second laser output unit outputting first and second pulsed laser; a laser controlling unit configured to control each laser output unit; a first or second detecting unit configured to detect an emission timing of laser and output a first or second detection signal; a probe configured to receive an acoustic wave from an object being irradiated with the laser; and a signal processing unit configured to acquire specific information of the object, based on the acoustic wave. The laser controlling unit controls output of at least one of the laser output units so as to decrease a time difference between subsequent first and second pulsed lasers to be output. 1. An apparatus , comprising:a first and a second laser output unit configured to output a first and a second pulsed laser respectively;a laser controlling unit configured to control the first and the second laser output unit;a first detecting unit configured to detect an emission timing of the first pulsed laser and output a first detection signal; anda second detecting unit configured to detect an emission timing of the second pulsed laser and output a second detection signal, whereinthe laser controlling unit controls output of at least one of the first and the second laser output unit, based on a time difference between the first and the second detection signals.2. The apparatus according to claim 1 , whereinthe laser controlling unit controls output of at least one of the first and the second laser output unit so as to decrease a time difference between subsequent first and second pulsed lasers to be irradiated to the object.3. The apparatus according to claim 1 , whereinthe laser controlling unit controls a temperature of a laser medium of the first laser output unit or the second laser output unit.4. The apparatus according to claim 1 , whereinthe laser controlling unit controls the emission timings of the first and ...

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Номер записи: 21

07-01-2016 дата публикации

Self-automatic gain control distributed raman fiber amplifier and automatic gain control method

Номер: US20160006206A1

Автор: Jeong Mee Kim, Meong Kyu CHOI, Soo Young Yoon, Sung Jun Kim, Woon Byung CHAE

Принадлежит: LICOMM CO Ltd

Disclosed is a self-automatic gain control distributed Raman fiber amplifier, in which a signal is transmitted to a self-AGC monitor and a PD via a pump/signal combiner through a transmission fiber and passes through an RFA control circuit, a self-AGC firmware, and an ASCII communication unit and an Raman pump laser module communicates with the RFA control circuit and transmits the signal to the pump/signal combiner.

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Номер записи: 22

04-01-2018 дата публикации

ONLINE CALIBRATION FOR REPETITION RATE DEPENDENT PERFORMANCE VARIABLES

Номер: US20180006425A1

Автор: "OBrien Kevin Michael", Aggarwal Tanuj, Burdt Russell Allen, Everts Frank, GODFRIED Herman Philip, Thornes Joshua Jon

Принадлежит:

Online calibration of laser performance as a function of the repetition rate at which the laser is operated is disclosed. The calibration can be periodic and carried out during a scheduled during a non-exposure period. Various criteria can be used to automatically select the repetition rates that result in reliable in-spec performance. The reliable values of repetition rates are then made available to the scanner as allowed values and the laser/scanner system is then permitted to use those allowed repetition rates. 1. A system comprising:a laser;a laser control unit operatively connected to the laser for controlling the laser to scan through a plurality of scanned repetition rates;a measurement unit arranged to measure an output from the laser for measuring at least one operating parameter of the laser for at least some of the scanned repetition rates, the operating parameter being laser gain or laser efficiency; andan evaluation unit operatively connected to the measurement unit for making a determination of whether a measured value for the operating parameter is within a predetermined range of values for the operating parameter for the at least some of the scanned repetition rates and providing an indication of the result of the determination,the laser control unit being operatively connected to the evaluation unit and configured to permit or recommend operation of the laser at one of the scanned repetition rates only if the value stored in association with the scanned repetition rate indicates that the operating parameter was measured to be within the predetermined range for that scanned repetition rate.2. A system as claimed in wherein the laser control unit operatively connected to the laser for driving the laser to scan through a plurality of repetition rates is configured to step the laser through a series of repetition rates where the difference in repetition rate between steps is maintained substantially constant.3. A system as claimed in wherein the laser ...

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Номер записи: 23

03-01-2019 дата публикации

WAVELENGTH LOCKER USING MULTIPLE FEEDBACK CURVES TO WAVELENGTH LOCK A BEAM

Номер: US20190006816A1

Автор: COLBOURNE Paul, Larson Michael C., McLaughlin Sheldon, XIONG Wei

Принадлежит:

A device may include a first photodetector to generate a first current based on an optical power of an optical beam. The device may include a beam splitter to split a portion of the optical beam into a first beam and a second beam. The device may include a wavelength filter to filter the first beam and the second beam. The wavelength filter may filter the second beam differently than the first beam based on a difference between an optical path length of the first beam and an optical path length of the second beam through the wavelength filter. The device may include second and third photodetectors to respectively receive, after the wavelength filter, the first beam and the second beam and to generate respective second currents. 126-. (canceled)27. A device , comprising:a laser emitter to generate a laser beam to be wavelength locked to a target frequency based on an emission frequency to be measured by the device; 'the laser beam to be wavelength locked based on the first current;', 'a first photodetector to generate a first current based on a first optical power of the laser beam,'}a beam splitter to split a portion of the laser beam into a first beam and a second beam; the patterned etalon to have different optical path lengths for the first beam and the second beam, and', 'the patterned etalon to filter the first beam and the second beam to a second optical power and a third optical power, respectively, based on the different optical path lengths; and, 'a patterned etalon to filter the first beam and the second beam,'} 'a selected current, of the respective second currents, to be used to wavelength lock the laser beam.', 'second and third photodetectors to generate respective second currents,'}28. The device of claim 27 , wherethe beam splitter is further to split the portion of the laser beam into a third beam and a fourth beam, andthe third beam is received by the first photodetector without being filtered by the patterned etalon.29. The device of claim 27 , ...

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Номер записи: 24

02-01-2020 дата публикации

Doped Optical Fiber Amplifier And Working Method Thereof

Номер: US20200006911A1

Автор: Hua Yimin, Lu Kaiyuan

Принадлежит:

The present disclosure provides a doped fiber amplifier and a working method thereof. The doped fiber amplifier including a seed source inputting signal light, a first isolator connected with the seed source, a coupler connected with the first isolator, a pump laser and a doped fiber connected with the coupler, a second isolator connected with the doped fiber, an optical splitter connected with the second isolator, and a connection head connected with the optical splitter. The connection head outputs a signal light of the seed source. 1. A doped fiber amplifier comprising a seed source inputting signal light , a first isolator connected with the seed source , a coupler connected with the first isolator , a pump laser and a doped fiber connected with the coupler , a second isolator connected with the doped fiber , an optical splitter connected with the second isolator , and a connection head connected with the optical splitter; wherein the connection head outputs the signal light of the seed source.2. The doped fiber amplifier according to claim 1 , wherein the optical splitter comprises main path signal optical fibers and branch path signal optical fibers claim 1 , all of the main path signal optical fibers are connected with the second isolator and the connection head.3. The doped fiber amplifier according to claim 2 , wherein the doped fiber amplifier comprising a detector connected with the branch path signal optical fiber of the optical splitter4. The doped fiber amplifier according to claim 3 , wherein the detector is a photodiode.5. The doped fiber amplifier according to claim 1 , wherein the seed source is a laser with a wavelength of 1550 nm.6. The doped fiber amplifier according to claim 1 , wherein the coupler is a wavelength divider.7. The doped fiber amplifier according to claim 1 , wherein the doped fiber is doped dilute fiber.8. The doped fiber amplifier according to claim 1 , wherein the doped fiber amplifier is arranged in a pluggable optical module ...

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Номер записи: 25

02-01-2020 дата публикации

METHOD AND APPARATUS FOR DETERMINING MAXIMUM GAIN OF RAMAN FIBER AMPLIFIER

Номер: US20200007238A1

Автор: Bu Qinlian, Fang Di, Fu Chengpeng, Le Menghui, Liu Fei, Tao Jintao, Yu Chunpin, Zhang Cuihong, Zhang Peng

Принадлежит: ACCELINK TECHNOLOGIES CO., LTD.

The present disclosure relates to a technical field of optical communication, and provides a method and an apparatus for determining maximum gain of Raman fiber amplifier. Wherein the method includes obtaining transmission performance parameters of a current optical fiber transmission line; respectively obtaining impact factors A, A, Aaccording to a distance between a joint and a pump source, a fiber loss coefficient, and a fiber length included in the transmission performance parameters; calculating a joint loss value Attaccording to a distance between a joint and a pump source, a fiber loss coefficient, and looking up impact factor Aaccording to Att; determining an actual maximum gain which may actually be achieved by the Raman fiber amplifier according to A, A, A, A. The actual maximum gain obtained in the present disclosure is the maximum gain that may be achieved over all input power ranges, and the original signal in system is kept to operate at a fixed gain, such that a gain locking effect is realized, and fluctuation of existing transmission signal power caused by signal change in transmission fiber link is avoided. 1. A method for determining a maximum gain of a Raman fiber amplifier , characterized in that a relationship between the maximum Raman gain and a 0 km joint loss Attequivalent to a joint loss at different positions of one or more types of fibers , a relationship between the maximum Raman gain and a 0 km joint loss Attequivalent to a joint loss caused by a loss coefficient of the fibers , a relationship between the maximum Raman gain and a 0 km joint loss Att equivalent to a joint loss caused by a mode field diameter of the fibers , and a relationship between the maximum Raman gain and a fiber length are pre-configured , where i is a distance from a joint to a pump source , j is the loss coefficient of the fibers , and k is the mode field diameter of the fibers , the method comprises:obtaining transmission performance parameters of a current ...

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Номер записи: 26

08-01-2015 дата публикации

Optical amplification control apparatus and control method of the same

Номер: US20150009555A1

Автор: Yurie Takahashi

Принадлежит: NEC Corp

An optical amplification control apparatus is provided with: a first branch unit for branching an optical signal to which an additional optical signal with a predetermined wavelength has been added in a self node or a nearest node; a first filter unit for extracting the additional optical signal from one optical signal into which the first branch unit has branched; an amplification unit for amplifying the other optical signal into which the first branch unit has branched; a second branch unit for branching the optical signal amplified by the amplification unit; a second filter unit for extracting the additional optical signal from one optical signal into which the second branch unit has branched; and a first control unit for performing automatic gain control of the amplification unit based on the additional optical signal extracted by the first filter unit, and the additional optical signal extracted by the second filter unit.

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Номер записи: 27

20-01-2022 дата публикации

APPARATUS AND METHODS FOR STABLE BIDIRECTIONAL OUTPUT FROM RING LASER GYROSCOPE

Номер: US20220021177A1

Автор: Marta Teresa, Qiu Tiequn, Wu Jianfeng

Принадлежит: HONEYWELL INTERNATIONAL INC.

Systems and methods for ring laser gyroscopes (RLGs) are provided. An RLG includes a traveling-wave resonator cavity with three or more mirrors and a gain medium positioned in the traveling-wave resonator cavity between two of the three or more mirrors. The gain medium is a solid-state gain medium or a nonlinear optical medium. The RLG further includes a first pump laser and a second pump laser to pump the gain medium in different directions and generate first and second lasing signals that traverse the traveling-wave resonator cavity in a opposite directions. The RLG further includes first and second photodetectors to measure levels of the first and second lasing signals. The RLG further includes at least one processor configured to adjust a power level of the first pump laser and/or a power level of the second pump laser based on the measured power levels of the first and second lasing signals. 1. A ring laser gyroscope , comprising:a traveling-wave resonator cavity comprising three or more mirrors;a gain medium positioned in the traveling-wave resonator cavity between two mirrors of the three or more mirrors, wherein the gain medium is a solid-state gain medium or a nonlinear optical medium;a first pump laser configured to pump the gain medium in a first direction and generate a first lasing signal that traverses the traveling-wave resonator cavity;a second pump laser configured to pump the gain medium in a second direction and generate a second lasing signal that traverses the traveling-wave resonator cavity in a direction opposite the first lasing signal;a first photodetector configured to measure a power level of the first lasing signal;a second photodetector configured to measure a power level of the second lasing signal; andat least one processor configured to adjust a power level of the first pump laser and/or a power level of the second pump laser based on the measured power level of the first lasing signal and the measured power level of the second lasing ...

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Номер записи: 28

10-01-2019 дата публикации

RECONFIGURABLE SPECTROSCOPY SYSTEM

Номер: US20190011639A1

Автор: Abediasl Hooman, Nagra Amit Singh, Rickman Andrew George, Schrans Thomas Pierre, Srinivasan Pradeep, TRITA Andrea, Zilkie Aaron John

Принадлежит:

A reconfigurable spectroscopy system comprises tunable lasers and wavelength lockers to lock to accurate reference wavelengths. Band combiners with differently optimized wavelength ranges multiplex the optical signal over the time domain, to emit a plurality of reference wavelengths for spectroscopy applications. The power requirements are greatly reduced by multiplexing over the time domain in time slots which do not affect sampling and receiving of the spectroscopy data. 1. A device comprising:a plurality of tunable lasers generating a plurality of wavelengths;a plurality of wavelength lockers to reduce wavelength noise from the plurality of wavelengths;a plurality of band combiners each configured to combine a different wavelength range than other band combiners of the plurality of band combiners;a plurality of switches, each switch receiving an output of a corresponding band combiner of the plurality of band combiners, each switch outputting a plurality of switched wavelengths;a plurality of broadband combiners receiving outputs of the plurality of switches; anda plurality of emitters to emit a plurality of reference wavelengths, each emitter receiving an output of a corresponding broadband combiner of the plurality of broadband combiners.2. The device of claim 1 , wherein each wavelength locker of the plurality of wavelength lockers is between a tunable laser of the plurality of tunable lasers and a band combiner of the plurality of band combiners.3. The device of claim 1 , wherein the plurality of wavelength lockers comprises a plurality of optical channel monitors located after the plurality of band combiners claim 1 , and feeding back to the plurality of tunable lasers.4. The device of claim 1 , wherein each band combiner of the plurality of band combiners is configured to operate within a wavelength range of 100 nm.5. The device of claim 1 , wherein each wavelength locker of the plurality of wavelength lockers comprises feed-forward or feedback noise ...

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Номер записи: 29

09-01-2020 дата публикации

System and Method for Increasing Coherence Length in Lidar Systems

Номер: US20200011980A1

Автор: Belsley Kendall L., Schulz Stephan, Sebastian Richard L.

Принадлежит:

Various implementations of the invention compensate for “phase wandering” in tunable laser sources. Phase wandering may negatively impact a performance of a lidar system that employ such laser sources, typically by reducing a coherence length/range of the lidar system, an effective bandwidth of the lidar system, a sensitivity of the lidar system, etc. Some implementations of the invention compensate for phase wandering near the laser source and before the output of the laser is directed toward a target. Some implementations of the invention compensate for phase wandering in the target signal (i.e., the output of the laser that is incident on and reflected back from the target). Some implementations of the invention compensate for phase wandering at the laser source and in the target signal. 1. A system for compensating for phase variance in a laser source comprising:a phase difference detector configured to receive a reference arm signal and to detect a phase difference of the reference arm signal, the phase difference corresponding to a difference in the phase of the reference arm signal at two points in time;a phase correction estimator configured to receive the phase difference from the phase detector and to estimate a phase correction to be applied to a target arm signal, wherein the phase correction compensates for the phase variance of the laser source;a phase modulator configured to receive the phase correction from the phase correction estimator, to modulate the target arm signal with the phase correction, and to output a phase corrected target arm signal; anda delay coupled either to either the reference arm signal and configured to introduce a delay time into the reference arm signal prior to being received by the phase difference detector or to the target arm signal prior to being received by the phase modulator, wherein the delay time comprises at least a round trip path delay.2. The system of claim 1 , wherein the delay is coupled to the target arm ...

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Номер записи: 30

03-02-2022 дата публикации

Systems and Methods for Performing an Intraocular Procedure for Treating an Eye Condition

Номер: US20220031513A1

Автор: Enders Markus, Junger Johannes

Принадлежит:

The invention provides an excimer laser system including a means for calibrating laser output to compensate for increased variation in laser optical fibers. 114-. (canceled)15. A method for performing an intraocular procedure for treating an eye condition , said method comprising: the data is indicative of at least a diameter of a fiber optic core of the one of the plurality of excimer laser probes,', 'the excimer laser source is configured to generate laser energy to be provided to each of the plurality of excimer laser probes, and', 'the plurality of excimer laser probes are single use and disposable, such that the plurality of excimer laser probes are each coupleable, one at a time, to said excimer laser source; and, 'upon each instance of connecting one of a plurality of excimer laser probes to an excimer laser source, automatically receiving, by a processor in communication with the excimer laser source, data from the one of the plurality of excimer laser probes coupled to the excimer laser source, whereinautomatically fine tuning and adjusting, by the processor, laser energy output from the excimer laser source to the one of the plurality of excimer laser probes based on the diameter of the fiber optic core such that the laser energy output from the one of the plurality of excimer laser probes is maintained at a desired level.16. The method of claim 15 , further comprising analyzing claim 15 , by the processor. the data by correlating the data with calibration data stored in a database.17. The method of claim 16 , wherein the calibration data is associated with the laser energy output from the excimer laser source.18. The method of claim 16 , wherein the calibration data is stored in a local database.19. The method of claim 16 , wherein the calibration data is stored in a remote database.20. The method of claim 16 , further comprising determining claim 16 , by the processor claim 16 , the laser energy output based on the correlation of the data with the ...

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Номер записи: 31

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: 32

11-01-2018 дата публикации

LASER SYSTEM

Номер: US20180013258A1

Автор: ASAYAMA Takeshi, Umeda Hiroshi, Wakabayashi Osamu

Принадлежит: Gigaphoton Inc.

The laser system may include a delay circuit unit, first and second trigger-correction units, and a clock generator. The delay circuit unit may receive a trigger signal, output a first delay signal obtained by delaying the trigger signal by a first delay time, and output a second delay signal obtained by delaying the trigger signal by a second delay time. The first trigger-correction unit may receive the first delay signal and output a first switch signal obtained by delaying the first delay signal by a first correction time. The second trigger-correction unit may receive the second delay signal and output a second switch signal obtained by delaying the second delay signal by a second correction time. The clock generator may generate a clock signal that is common to the delay circuit unit and the first and second trigger-correction units. 1. A laser system comprising:laser apparatuses configured to emit respective pulse laser beams;a beam bundling device configured to bundle the pulse laser beams each emitted from a corresponding laser apparatus of the laser apparatuses and to emit a bundled laser beam to an exposure apparatus; and receive target energy of the bundled laser beam and target pulse waveform of the bundled laser beam from the exposure apparatus,', 'calculate target pulse energy for each of the pulse laser beams emitted from the corresponding laser apparatus based on the target energy of the bundled laser beam,', 'calculate target delay time for each of the pulse laser beams emitted from the corresponding laser apparatus based on the target pulse waveform of the bundled laser beam, and', 'send, to the corresponding laser apparatus, the target pulse energy for a corresponding pulse laser beam of the pulse laser beams emitted from the corresponding laser apparatus and the target delay time for the corresponding pulse laser beam emitted from the corresponding laser apparatus., 'a laser system controller configured to'}2. The laser system according to claim ...

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Номер записи: 33

15-01-2015 дата публикации

LASER LIGHT SOURCE MODULE FOR PROJECTION SYSTEM

Номер: US20150015850A1

Автор: CHO CHUN-HSIEN, WANG Bor

Принадлежит: DELTA ELECTRONICS, INC.

A projection system includes a laser light source module, at least one display module, and a projection lens. The laser light source module includes at least one light source, at least one wavelength conversion element, at least one light detecting unit, and a controller. The laser light source emits a first light beam with a first wavelength. The wavelength conversion element is used for converting the first light beam into a light beam with a wavelength different from the first wavelength. After an optical energy of the light beam outputted from the wavelength conversion element and higher than a systematic etendue is detected by an optical sensor of the laser light source module, at least one of a brightness and a light color of the laser light source module is adjusted or compensated by the controller according to the detecting result. 1. A projection system , comprising: at least one laser light source for emitting a first light beam with a first wavelength;', 'at least one wavelength conversion element for converting the first light beam into a light beam with a wavelength different from the first wavelength;', 'at least one light detecting unit comprising at least one optical sensor; and', 'a controller electrically connected with the light detecting unit;, 'a laser light source module comprisingat least one display module for receiving the light beam from the laser light source module, and outputting a modulated light beam; anda projection lens for receiving the modulated light beam and projecting an image beam,wherein after an optical energy of the light beam outputted from the wavelength conversion element and higher than a systematic etendue is detected by the optical sensor of the laser light source module, at least one of a brightness and a light color of the laser light source module is adjusted or compensated by the controller according to the detecting result.2. The projection system according to claim 1 , wherein the wavelength conversion element ...

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Номер записи: 34

09-01-2020 дата публикации

PRECISION FREQUENCY COMBS

Номер: US20200014167A1

Автор: Cassinerio Marco, FERMANN Martin E., JIANG JIE, Rolland Antoine Jean Gilbert

Принадлежит:

Examples of compact control electronics for precision frequency combs are disclosed. Application of digital control architecture in conjunction with compact and configurable analog electronics provides precision control of phase locked loops with reduced or minimal latency, low residual phase noise, and/or high stability and accuracy, in a small form factor. 1. A control system for feedback control of at least one parameter of a laser system comprising:an analog proportional-integral-derivative (PID) based feedback loop (analog PID), said analog PID configured with an analog control loop;a digital proportional-integral-derivative (PID) based feedback loop (digital PID), said digital PID configured in a digital control architecture;wherein PID parameters in said analog control loop are configured in response to one or more signals generated with said digital control architecture.2. A control system according to claim 1 , said analog PID configured in a field programmable analog array (FPAA) architecture.3. A control system according to claim 1 , said digital PID configured in a field programmable gate array (FPGA) architecture.4. A control system according to claim 1 , wherein an output of said analog PID is fed to an input of the digital PID.5. A control system according to claim 1 , wherein said laser system comprises a frequency comb laser.6. A control system according to claim 5 , wherein said analog PID feedback loop includes an actuator for control of a beat frequency of said frequency comb laser with an external reference laser.7. A control system according to claim 5 , wherein said frequency comb laser is configured for low phase noise generation at a carrier frequency F via optical frequency division claim 5 , said frequency comb laser producing a single-sided phase noise spectral density <−150+20*log(F/F) dBc/Hz claim 5 , where F=10 GHz claim 5 , anywhere in an offset frequency range from 10 kHz to 100 kHz.8. A control system according to claim 5 , wherein ...

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Номер записи: 35

09-01-2020 дата публикации

Line narrowing module

Номер: US20200014168A1

Автор: Miwa Igarashi, Shinichi Matsumoto

Принадлежит: GIGAPHOTON INC

A line narrowing module includes a prism that refracts laser light in a first plane, a grating that disperses the laser light in the first plane, first to fourth elements, and a rotation mechanism and narrows the linewidth of the laser light. The second element is supported between the first and fourth elements by the first element. The rotation mechanism rotates the second element relative to the first element around an axis intersecting the first plane. The prism is located between the second and fourth elements and so supported by the second element that the rotation mechanism rotates the prism and the second element. The third element has elasticity and is compressed and located between the prism and the fourth element. The fourth element receives reaction force from the compressed third element. The second element is mechanically independent of the fourth element in the rotational direction of the rotation mechanism.

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Номер записи: 36

18-01-2018 дата публикации

ACTIVE STABILIZATION OF MODE INSTABILITIES IN OPTICAL WAVEGUIDES

Номер: US20180019566A1

Автор: Jauregui Misas César, Limpert Jens, OTTO Hans-Juergen, STIHLER Christoph, Stutzki Fabian, Tuennermann Andreas

Принадлежит:

A method of propagating a laser signal through an optical waveguide and a waveguide laser system provide a novel way of stabilizing the beam emitted by a fiber laser system above the mode instability threshold wherein the beat length of two or more interfering transverse modes of the laser signal in the optical waveguide is modulated in time. 1. A method of propagating a laser signal through an optical waveguide , wherein the beat length of two or more transverse modes of the laser signal in the optical waveguide is modulated.2. The method of claim 1 , wherein the frequency of the modulation of the beat length is close to the inverse of the thermalization time of a core of the optical waveguide.3. The method of claim 1 , wherein the frequency of the modulation of the beat length is close to the time of fluctuations of the laser beam observed at the output of the optical waveguide.4. The method of claim 1 , wherein the beat length of the transverse modes is modulated with a frequency below 100 kHz claim 1 , preferably below 10 kHz.5. The method of claim 1 , wherein the optical waveguide is optically active and is optically pumped to amplify the laser signal while propagating through the optical waveguide.6. The method of claim 5 , wherein the modulation of the beat length of the transverse modes is achieved by modulating the pump power.7. The method of claim 6 , wherein at least two pump sources are used claim 6 , wherein the pump radiation of one of the pump sources propagates in the co-propagating direction and the pump radiation of another one of the pump sources propagates in the counter-propagating direction with respect to the laser signal through the optical waveguide.8. The method of claim 7 , wherein the modulation of the pump power of the pump sources is synchronized to achieve a constant power of the laser signal at the output of the optical waveguide.9. The method of claim 5 , wherein the modulation of the beat length of the transverse modes is achieved ...

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Номер записи: 37

21-01-2021 дата публикации

SPECTRAL FEATURE SELECTION AND PULSE TIMING CONTROL OF A PULSED LIGHT BEAM

Номер: US20210018846A1

Автор: "OBrien Kevin Michael", Duffey Thomas Patrick, Thornes Joshua Jon

Принадлежит:

A method includes driving, while producing a burst of pulses at a pulse repetition rate, a spectral feature adjuster among a set of discrete states at a frequency correlated with the pulse repetition rate; and in between the production of the bursts of pulses (while no pulses are being produced), driving the spectral feature adjuster according to a driving signal defined by a set of parameters. Each discrete state corresponds to a discrete value of a spectral feature. The method includes ensuring that the spectral feature adjuster is in one of the discrete states that corresponds to a discrete value of the spectral feature of the amplified light beam when a pulse in the next burst is produced by adjusting one or more of: an instruction to the lithography exposure apparatus, the driving signal to the spectral feature adjuster, and/or the instruction to the optical source. 1. A method comprising:producing a burst of pulses of an amplified light beam at a pulse repetition rate and directing the pulses to a lithography exposure apparatus;while producing the pulse burst, driving a spectral feature adjuster among a set of discrete states at a frequency correlated with the pulse repetition rate, with each discrete state corresponding to a discrete value of the spectral feature of the amplified light beam out of a plurality of pre-set discrete values of the spectral feature, such that, each time a pulse in the burst is being produced, the spectral feature adjuster is in one of the discrete states and the amplified light beam pulse has a spectral feature that corresponds to that discrete state;in between the production of the bursts of pulses and while no pulses are being produced, driving the spectral feature adjuster in a manner that is related to information received from the lithography exposure apparatus; andensuring that the spectral feature adjuster is in one of the discrete states that corresponds to a discrete value of the spectral feature of the amplified light ...

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Номер записи: 38

18-01-2018 дата публикации

LASER POWER CONTROLLER

Номер: US20180019823A1

Автор: COUE Dominique, Redman-White William, WHITFIELD Colin

Принадлежит: HILIGHT SEMICONDUCTOR LIMITED

A laser power controller employs: selection circuitry configured to select one of a data input value, a logical high value or a logical low value such that the selection circuitry selects the data input value during a data transmission period during a defined burst period and selects one of the logical high value and the logical low value during an extension time period during the defined burst period and immediately following the data transmission period; drive circuitry configured to apply, to a laser diode, a current corresponding to the value selected by the selection circuitry during the defined burst period or a zero value otherwise, the current being such that the laser diode is configured to provide an optical output; an optical sensor module configured to provide a sensor module output corresponding to the optical output of the laser diode, and configured to provide an electrical output proportional to the laser diode's optical output corresponding to the logical high value or the logical low value; and a controller configured to receive desired values regarding minimum and maximum optical output power levels of the laser diode and to receive the electrical output from the optical sensor module proportional to the optical output power level corresponding to the logical high and the logical low values; the controller being configured to use the received information to provide control values for the drive circuitry. 1. A system comprising:selection circuitry configured to select one of a data input value, a logical high value or a logical low value such that the selection circuitry selects the data input value during a data transmission period during a defined burst period and selects one of the logical high value and the logical low value during an extension time period during the defined burst period and immediately following the data transmission period;drive circuitry configured to apply a current to a laser diode, the current corresponding to the value ...

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Номер записи: 39

17-04-2014 дата публикации

ON-CHIP OPTICAL REFERENCE CAVITY EXHIBITING REDUCED RESONANCE CENTER FREQUENCY FLUCTUATIONS

Номер: US20140105232A1

Автор: Chen Tong, LEE Hansuek, SUH Myoung-Gyun, VAHALA Kerry

Принадлежит:

An optical apparatus comprises a waveguide substrate and an optical reference cavity. The optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 cm in length. The RMS resonance frequency fluctuation is less than or about equal to 100 Hz. The Q-factor can be greater than or about equal to 10. The optical waveguide can exhibit optical loss less than or about equal to 0.2 dB/m for propagation of an optical signal along the optical waveguide. The closed loop path can comprise two or more linked spirals greater than or about equal to 1 meter in length and can occupy an area on the waveguide substrate less than or about equal to 5 cm. 1. An optical apparatus comprising:(a) a waveguide substrate; and(b) an optical reference cavity that (i) exhibits multiple resonance frequencies over an operational wavelength range and (ii) can be characterized over the operational wavelength range by a Q-factor and a RMS resonance frequency fluctuation,wherein:(c) the optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 cm in length; and(d) the RMS resonance frequency fluctuation is less than or about equal to 100 Hz.2. The optical apparatus of wherein:(c′) the optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 2 meters in length;(d′) the RMS resonance frequency fluctuation is less than or about equal to 20 Hz; or{'sup': '8', '(e′) the Q-factor is greater than or about equal to 2×10.'}3. The optical apparatus of wherein:(c′) the optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 meters in length;(d′) the RMS resonance frequency fluctuation is less than or about equal to 10 ...

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Номер записи: 40

22-01-2015 дата публикации

Current controlling apparatus for automotive lamp

Номер: US20150023032A1

Автор: Doo Woon Kang

Принадлежит: SL Corp

A current controlling apparatus for an automotive lamp is provided that adjusts a current applied to the automotive lamp that uses laser light as a light source to adjust the intensity of the laser light. The automotive lamp includes a light source that generates laser light and a phosphor excited by the generated laser light to generate light of a predetermined color. A minor is configured to transmit therethrough a first portion of the generated laser light while reflecting a second portion of the generated laser light. A light receiver is configured to receive reflected laser light from the minor and output an output signal based on an intensity of the received laser light. In addition, a controller is configured to detect an intensity of the generated laser light based on the output signal and adjust a current applied to the light source based on results of the detection.

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Номер записи: 41

21-01-2021 дата публикации

LITHOGRAPHY SYSTEM BANDWIDTH CONTROL

Номер: US20210021094A1

Автор: Aggarwal Tanuj

Принадлежит:

Methods and apparatus for controlling laser firing timing and hence bandwidth in a laser capable of operating at any one of multiple repetition rates. 1. Apparatus comprising:a laser configured to operate at a first repetition rate selected from a plurality of repetition rates at which the laser is capable of operating;a comparison module adapted to determine if the first repetition rate is substantially the same as a second repetition rate used immediately prior by the laser; anda control module adapted to alter a control parameter of the laser if the comparison module determines that the first repetition rate is not substantially the same as the second repetition rate.2. Apparatus as claimed in wherein the laser has a first chamber and a second chamber and wherein the control parameter is a timing parameter DtMOPA relating to a timing of firing in the second chamber relative to a timing of firing in the first chamber.3. Apparatus as claimed in wherein the laser has a first chamber and a second chamber and wherein the control parameter is a moving average of a timing parameter DtMOPA relating to a timing of firing in the second chamber relative to a timing of firing in the first chamber.4. Apparatus as claimed in further comprising a timing module adapted to determine an amount of elapsed time since the second repetition rate used was substantially the same as the first repetition rate; and wherein the control module is additionally adapted to alter the control parameter at least partially on the basis of the amount of elapsed time as determined by the timing module.5. Apparatus as claimed in wherein the control module is further adapted to alter the control parameter at least partially on the basis of the amount of elapsed time by altering a feedforward gain.6. Apparatus as claimed in further comprising a correlator including a memory claim 1 , the memory being adapted to store feedforward correlation data correlating a value of the control signal to each of the ...

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Номер записи: 42

26-01-2017 дата публикации

Raman Pump Laser Control Apparatus And Control Method Therefor

Номер: US20170025814A1

Автор: Bu Qinlian, Fu Chengpeng, Jing Yunyu, Le Menghui, Tao Jintao, Xiong Tao, Yu Chunping

Принадлежит:

A Raman pump laser control apparatus comprises a wavelength division multiplexer, a tap coupler, a photoelectric detector, an analogue amplification processing circuit, an analogue-to-digital converter, a fast Raman pump control unit, an digital-analog converter, and a Raman pump laser. The fast Raman pump control unit, after having known anticipated output light power of the Raman pump laser, based on a direct relationship between a current anticipated output light power of the Raman pump laser and input digital quantity that is needed by the digital-analog converter, uses a feedforward control mechanism so that actual output light power of the Raman pump laser fastly approximates the anticipated output light power thereof, and then synchronously combines with a feedback control mechanism so that the actual output light power of the Raman pump laser is precisely locked on the anticipated output light power, thereby achieving fast and precise control of the Raman pump laser. 1. A control device of Raman pump laser , comprising a wavelength division multiplexer , a tap coupler , a photoelectric detector , an analog amplifier processing circuit , an analog-digital converter , a fast Raman pump control unit , a digital-analog converter , and a Raman pump laser ,wherein the wavelength division multiplexer couples the pump light output from the tap coupler with signal light;the tap coupler splits the pump light, one part of light energy of the split light is coupled into the wavelength division multiplexer, and another part enters into the photoelectric detector,the photoelectric detector detects the split light output from the tap coupler,the analog amplifier processing circuit performs amplification processing on the analog signal detected by the photoelectric detector,the analog-digital converter converts the analog signal processed by the analog amplifier processing circuit into digital signal,the fast Raman pump control unit performs data processing on digital ...

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Номер записи: 43

28-01-2016 дата публикации

Optical amplifier and control method thereof

Номер: US20160028209A1

Автор: Motoyoshi Kawai

Принадлежит: NEC Corp

In an optical amplifier, the excitation light level of an excited laser diode decreases, or, when the output of an excitation light is stopped, a backup excited laser diode is operated, and therefore the current consumption increases. [Solution] This optical amplifier is provided with multiple excitation laser diodes, a first current control element, a second current control element, and control means. The excitation laser diodes oscillate excitation light, the excitation light being inputted to an optical fiber amplifier. The first current control element controls a current flowing in the excitation laser diodes. The second current control element controls a current flowing in at least one of the excitation laser diodes. The control means controls the first current control element and the second current control element.

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Номер записи: 44

25-01-2018 дата публикации

LASER UNIT AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUM

Номер: US20180026414A1

Автор: KUROSU Akihiko, MASUDA Hiroyuki, MATSUNAGA Takashi, Ohta Takeshi, TSUSHIMA Hiroaki, Wakabayashi Osamu, YASHIRO Masanori

Принадлежит: Gigaphoton Inc.

There may be provided a laser unit including a display configured to display one or both of electric power consumed by the laser unit and electric energy consumed by the laser unit. 1. A laser unit comprising:a pair of electrodes;a fan configured to make flow of gas fed to a clearance between the electrodes;a motor configured to rotate the fan; anda display configured to display one or both of electric power consumed by the laser unit and electric energy consumed by the laser unit,the electric power consumed by the laser unit including electric power consumed by the motor,the electric energy consumed by the laser unit including electric energy consumed by the motor,the electric power consumed by the motor being calculated based on pressure of the gas fed to the clearance between the electrodes, andthe electric energy consumed by the motor being calculated based on the pressure of the gas fed to the clearance between the electrodes.2. The laser unit according to claim 1 , further comprising a charger configured to apply a voltage between the electrodes claim 1 , whereinthe electric power consumed by the laser unit includes one or more of electric power consumed by the charger, the electric power consumed by the motor, and a sum of the electric power consumed by the charger and the electric power consumed by the motor, andthe electric energy consumed by the laser unit includes one or more of electric energy consumed by the charger, the electric energy consumed by the motor, and a sum of the electric energy consumed by the charger and the electric energy consumed by the motor.3. The laser unit according to claim 2 , wherein the electric energy consumed by the charger is obtained by integrating the electric energy consumed through applying the voltage to the pair of electrodes.4. The laser unit according to claim 2 , further comprising a standby-power supply configured to supply the laser unit with standby electric power claim 2 , whereinthe electric power consumed by ...

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Номер записи: 45

25-01-2018 дата публикации

Coherent Combining Pulse Bursts In Time Domain

Номер: US20180026418A1

Автор: GALVANAUSKAS Almantas

Принадлежит:

A beam combining and pulse stacking technique is provided that enhances laser pulse energy by coherent stacking pulse bursts (i.e. non-periodic pulsed signals) in time domain. This energy enhancement is achieved by using various configurations of Fabry-Perot, Gires-Tournois and other types of resonant cavities, so that a multiple-pulse burst incident at either a single input or multiple inputs of the system produces an output with a solitary pulse, which contains the summed energy of the incident multiple pulses from all beams. This disclosure provides a substantial improvement over conventional coherent-combining methods in that it achieves very high pulse energies using a relatively small number of combined laser systems, thus providing with orders of magnitude reduction in system size, complexity, and cost compared to current combining approaches. 118.-. (canceled)19. A system for coherently combining pulses of a pulsed optical signal in the time domain , comprising:a first combining stage configured to receive an optical input signal and comprised of one or more resonant cavities arranged in a sequential manner with each other, wherein the optical input signal has one or more clusters of pulses in a pulse train, such that amplitude and phase of pulses in the one or more clusters varies amongst pulses, and wherein each resonant cavity in the first combining stage has an entirely reflective cavity and operates to coherently combine pulses in the one or more clusters in the time domain to form an output signal; anda second combining stage configured to receive the output signal from the first combining stage and comprised of one or more resonant cavities arranged in a sequential manner with each other, wherein each resonant cavity in the second combining stage has an entirely reflective cavity and operates to coherently combine pulses in the output signal in the time domain.20. The system of wherein each of the one or more resonant cavities in the first combining ...

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Номер записи: 46

23-01-2020 дата публикации

Comb laser arrays for dwdm interconnects

Номер: US20200026011A1

Автор: Geza Kurczveil, Marco Fiorentino, Mir Ashkan SEYEDI, Raymond G. Raymond

Принадлежит: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

A photonic integrated circuit package includes two arrays or sets of integrated comb laser modules that are bonded to a silicon interposer. Each comb laser of an array has a common or overlapping spectral range, with each laser in the array being optically coupled to a local optical bus. The effective spectral range of the lasers in each array are different, or distinct, as to each array. An optical coupler is disposed within the silicon interposer and is optically coupled to each of the local optical buses. An ASIC (application specific integrated circuit) is bonded to the silicon interposer and provides control and operation of the comb laser modules.

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Номер записи: 47

28-01-2021 дата публикации

RFOG RESONANCE HOPPING

Номер: US20210025708A1

Автор: Sanders Glen A., Smiciklas Marc, Strandjord Lee K., Wu Jianfeng

Принадлежит: HONEYWELL INTERNATIONAL INC.

Systems and methods for performing resonator fiber optic gyroscope (RFOG) resonance hopping are described herein. For example, an RFOG includes a fiber optic resonator. The RFOG also includes a plurality of laser sources that each launch a respective laser for propagation within the fiber optic resonator. Further, the RFOG includes a threshold detector that determines when the operation of at least one laser source in the plurality of laser sources exceeds a threshold associated with the operational range of an aspect of the at least one laser source. Additionally, the RFOG includes a hop control logic that adjusts the frequency of at least one laser produced by the at least one laser source one or more resonant modes of the fiber optic resonator such that the aspect of the at least one laser moves away from the threshold towards a nominal value within the operational range. 1. A resonator fiber optic gyroscope (RFOG) comprising:a fiber optic resonator;a plurality of laser sources that each launch a respective laser for propagation within the fiber optic resonator;a threshold detector that determines when the operation of at least one laser source in the plurality of laser sources exceeds a threshold associated with the operational range of an aspect of the at least one laser source; anda hop control logic that adjusts the frequency of at least one laser produced by the at least one laser source one or more resonant modes of the fiber optic resonator such that the aspect of the at least one laser moves away from the threshold towards a nominal value within the operational range.2. The RFOG of claim 1 , wherein the hop control logic further:directs one or more control loops for the at least one laser to open when the frequency of the at least one laser is adjusted; anddirects the one or more control loops to close when frequency of the at least one laser is associated with the operational range of the aspect of the at least one laser.3. The RFOG of claim 2 , wherein ...

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Номер записи: 48

29-01-2015 дата публикации

OPTICAL PULSE-GENERATOR AND OPTICAL PULSE-GENERATING METHOD

Номер: US20150029575A1

Автор: Hara Tokutaka, HOSOKAWA Youichi

Принадлежит:

Provided is an optical pulse-generator and an optical pulse-generating method which are capable of generating an optical pulse train with an arbitrary pattern. An optical pulse-generator includes a first optical modulator configured to modulate input light using a first modulation signal SIG to generate optical pulses, a second optical modulator configured to perform a modulation operation using a second modulation signal SIG synchronizing with the first modulation signal SIG and having a signal pattern that is set to output only specific part of the optical pulses, and a dispersion compensator configured to compensate a chirp of the optical pulse output from the first optical modulator 1. An optical pulse-generator comprising:a first optical modulator configured to modulate input light using a first modulation signal to generate optical pulses;a second optical modulator configured to perform a modulation operation using a second modulation signal synchronizing with the first modulation signal and having a signal pattern that is set to output only specific part of the optical pulses; anda dispersion compensator configured to compensate a chirp of the optical pulse output from the first optical modulator.2. The optical pulse-generator according to claim 1 , wherein at least one of the first optical modulator and the second optical modulator is an LN modulator.3. The optical pulse-generator according to claim 1 , wherein the dispersion compensator is disposed behind the first optical modulator and ahead of the second optical modulator.4. The optical pulse-generator according to claim 1 , further comprising:an optical pulse compressor configured to perform a soliton compression to an optical pulse output from a follower one of the second optical modulator and the dispersion compensator in an optical transmission direction.5. The optical pulse-generator according to claim 1 , further comprising:a phase adjuster configured to perform the timing synchronization between ...

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Номер записи: 49

29-01-2015 дата публикации

Noise detection, diagnostics, and control of modelocked lasers

Номер: US20150030045A1

Автор: Christian Mohr, Ingmar Hartl

Принадлежит: IMRA America Inc

The present invention features a laser based system configured with a noise detection unit. The system includes a mode-locked oscillator. A noise detection unit includes at least one optical detector that monitors optical pulses generated by the mode-locked oscillator and produces an electrical signal in response to the optical pulses. The noise detection unit includes a first filter to transmit signal power over a signal bandwidth which includes the mode-locked laser repetition frequency, frep. The noise detection unit may include one or more filters to transmit power over a noise bandwidth that substantially excludes repetition frequency, frep. Non-linear signal processing equipment is utilized to generate one or more signals representative of the power in the signal bandwidth relative to the power in the noise bandwidth. The system includes a controller operable to generate a signal for controlling the laser based system based on the relative power.

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Номер записи: 50

01-02-2018 дата публикации

LASER SYSTEM FOR GENERATING LASER PULSE OF SUB-NANOSECOND DURATION

Номер: US20180034231A1

Автор: Cannone Fabio, Cerri Luca, Paleari Fabio, Tagliaferri Marco

Принадлежит:

A laser system for generating a series of laser pulses comprising a laser generator that supplies an injection pulse to an amplifier; said amplifier comprising: a gain medium enclosed between a first mirror and a second, output, mirror opposite to said first mirror; and an optical switch set in the proximity of said first mirror; said laser system being characterized in that said amplifier is an unstable laser resonator and said injection pulse is supplied to said laser resonator in synchronism with opening of said optical switch; said series of laser pulses comprises at least one pulse having a duration shorter than or equal to 2 ns and an energy higher than 100 mJ and at least three times higher than the energy of any other pulse of said series of pulses. 1. A laser system for generating a series of laser pulses comprising a laser generator that supplies an injection pulse to an amplifier; said amplifier comprising: a gain medium enclosed between a first mirror and a second , output , mirror opposite to said first mirror; and an optical switch set in the proximity of said first mirror; said system being characterized in that: said amplifier is an unstable laser resonator , and said injection pulse is supplied to said laser resonator in synchronism with opening of said optical switch; and said series of laser pulses comprises at least one pulse having a duration shorter than or equal to 2 ns and an energy higher than 100 mJ and at least three times higher than the energy of any other pulse of said series of pulses.2. The system according to claim 1 , IS characterized in that said at least one pulse has an energy higher than 500 mJ.3. The system according to claim 1 , characterized in that said at least one pulse has an energy higher than 1 J.4. The system according to claim 1 , characterized in that said series of laser pulses comprises at least one pulse having an energy at least five times higher than the energy of any other pulse of said series of pulses.5. The ...

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Номер записи: 51

01-02-2018 дата публикации

LASER CONTROL DEVICE, METHOD AND PROGRAM

Номер: US20180034232A1

Автор: MIYATA Ryusuke

Принадлежит: FANUC Corporation

A laser control device includes: an averaging circuit that applies a primary delay filter to an actual instantaneous value; a data processing unit that applies a primary delay filter to an actual average value H, thereby calculating an actual average value S; a reference value generation unit that generates an reference value; and an output reduction determination unit that determines output reduction. In a case in which pulse on time in the output command value exceeds a sum of the processing period and start-up time of a power supply, if the actual instantaneous value falls below the reference value, it is determined that an output is reduced; and in a case in which the pulse on time is equal to or less than the sum, if the actual average value S falls below the reference value, it is determined that an output is reduced. 1. A laser control device , comprising:an averaging circuit that applies a primary delay filter to an actual instantaneous value of intensity of light that is output from a laser oscillator;a data processing unit that applies a primary delay filter to a first filter value calculated by way of the averaging circuit, for each predetermined processing period, thereby calculating a second filter value;a reference value generation unit that generates an output reduction reference value, based on an output command value for the laser oscillator; andan output reduction determination unit that compares the actual instantaneous value or the second filter value with the output reduction reference value, thereby determining output reduction of the laser oscillator, whereinin a case in which pulse on time in the output command value exceeds a sum of the processing period and start-up time of a power supply of the laser oscillator, if the actual instantaneous value falls below the output reduction reference value, the output reduction determination unit determines that an output is reduced, andin a case in which the pulse on time is equal to or less than the ...

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Номер записи: 52

01-02-2018 дата публикации

Stabilizing optical frequency combs

Номер: US20180034233A1

Автор: Marc Fischer, Olaf Mandel, Ronald Holzwarth

Принадлежит: Menlo Systems GmbH

The invention relates to a method for operating a laser device ( 1 ), by means of which an optical frequency comb can be stabilized, wherein the frequencies of the modes thereof are describable by the formula f m =m×f rep +f 0 , where f rep is a mode spacing, f 0 is an offset frequency and m is a natural number. At least one signal (S 1, S 2, S 3, S 4 ) is determined, which correlates with an actual value of a degree of freedom (F), wherein the degree of freedom (F) is a linear combination of the offset frequency f 0 and the mode spacing f rep of the frequency comb. The actual value of the degree of freedom (F) is set in a predetermined capture range (F) of a second control unit ( 40 ) using a first control unit ( 10 ) on the basis of the signal. As soon as the capture range (ΔF capture ) of the second control unit ( 40 ) is reached, the second control unit ( 40 ) is activated and the actual value is regulated to an intended value (ΔF intended ) with the aid of the second control unit ( 40 ).

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Номер записи: 53

17-02-2022 дата публикации

LASER DEVICE

Номер: US20220052505A1

Автор: ANDO Toshiyuki, HARAGUCHI Eisuke

Принадлежит: Mitsubishi Electric Corporation

A laser device includes element circuits, a front optical system, and a reflective optical system. The front optical system forms a plurality of light beams by collimating a plurality of phase modulated light signals input from the element circuits, and generate a plurality of partially reflected light signals by partially reflecting the plurality of phase modulated light signals. The reflective optical system multiplexes the input local oscillation light with the plurality of partially reflected light signals by reflecting the local oscillation light in a direction of the front optical system. The element circuits can convert each of a plurality of interference light signals generated by multiplexing of the plurality of partially reflected light signals and the local oscillation light into a plurality of electric signals, and can detect a phase error between the plurality of electric signals and a reference signal. 1. A laser device comprising:a light distributor distributing reference laser light into local oscillation light and a plurality of light signals;a plurality of optical phase controllers generating a plurality of phase control light signals by performing variable phase control on each of the plurality of light signals in accordance with a plurality of input light phase control signals;a plurality of light amplifiers generating a plurality of amplified light signals by amplifying the plurality of phase control light signals;a front optical system forming a plurality of light beams by collimating the plurality of amplified light signals and generating a plurality of partially reflected light signals propagating in a direction opposite to a propagation direction of the plurality of light beams by partially reflecting the plurality of amplified light signals;a reflective optical system multiplexing the local oscillation light with the plurality of partially reflected light signals by reflecting the local oscillation light input from the light distributor in ...

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Номер записи: 54

17-02-2022 дата публикации

Dual output laser diode

Номер: US20220052510A1

Автор: Abram Jakubowicz, Jean Axel Edmond Teissier, Nadhum Kadhum Zayer, Susanne Pawlik

Принадлежит: II VI Delaware Inc

A dual output laser diode may include first and second end facets and an active section. The first and second end facets have low reflectivity. The active section is positioned between the first end facet and the second end facet. The active section is configured to generate light that propagates toward each of the first and second end facets. The first end facet is configured to transmit a majority of the light that reaches the first end facet through the first end facet. The second end facet is configured to transmit a majority of the light that reaches the second end facet through the second end facet.

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Номер записи: 55

04-02-2021 дата публикации

DRIVING CURRENT CORRECTION METHOD AND APPARATUS FOR MULTIPLE LASER DEVICES, AND LASER PROJECTOR

Номер: US20210036483A1

Автор: WANG Xianbin, YANG Lebao

Принадлежит: GOERTEK INC.

The present invention discloses a driving current correction method and apparatus for multiple laser devices, and a laser projector. A specific embodiment of the method includes in a projection period of a nth pixel point: sequentially driving a plurality of laser devices of a laser source to emit laser, and respectively detecting light intensity information of lasers emitted from the plurality of laser devices by using a light sensor; acquiring an actual light intensity of the lasers emitted from the plurality of laser devices according to an electric signal output by the light sensor, and establishing a corresponding relation between a driving current and an actual light intensity of each laser device according to the driving current of the each laser device and the actual light intensity of the laser emitted from the each laser device when the n-th pixel point is projected; from a projection of a (n+1)-th pixel point: correcting the driving current of the each laser device according to a set light intensity of the each laser device and the corresponding relation between the driving current and the actual light intensity of the each laser device. The implementation has a high consistency of detecting light intensity information that can be simply performed. 1. A driving current correction method for multiple laser devices , comprising:in a projection period of a n-th pixel point:sequentially driving a plurality of laser devices of a laser source to emit laser, and respectively detecting light intensity information of lasers emitted from the plurality of laser devices by using a light sensor;acquiring an actual light intensity of the lasers emitted from the plurality of laser devices according to an electric signal output by the light sensor, and establishing a corresponding relation between a driving current and an actual light intensity of each laser device according to the driving current of the each laser device and the actual light intensity of the laser ...

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Номер записи: 56

04-02-2021 дата публикации

INJECTION-LOCKED LASER SYSTEM

Номер: US20210036484A1

Автор: MAKER Gareth Thomas, MALCOLM Graeme Peter Alexander, WEBSTER Stephen

Принадлежит:

A method and system for injection-locking multiple optical amplifiers is disclosed. A master laser is employed to generate a continuous-wave output field. Optical modulators then produce first and second seed optical fields from the continuous-wave output field. The first and second seed optical fields provide an input to injection lock one or more optical amplifiers, optionally at different operating frequencies. Since the first and second seed optical fields are generated from the continuous-wave output field then the output fields of the optical amplifiers exhibit a high phase-coherence with each other and with the continuous-wave output field. Employing the first and second optical fields reduces the requirement to induce large frequency shifts on a single optical field. Techniques for phase-locking the output of the injection-locked laser systems are also provided to further reduce phase noise within the systems. 1125. An injection-locked laser system ( , ) comprising:{'b': 2', '4, 'sub': '0', 'a master laser () that generates a continuous-wave output field () having a frequency (f);'}{'b': 5', '5', '5', '4', '6', '7, 'i': a', 'd, 'sub': 1', '2, 'one or more optical modulators (, , ) employed to produce from the continuous-wave output field () a first seed optical field () having a first frequency (f) and a second seed optical field () having a second frequency (f);'}{'b': 6', '8', '8', '12', '1', '25, 'i': a', 'c', 'a', 'c', 'a', 'c, 'sub': 1', '1, 'wherein the first seed optical field () provides an input to injection lock one or more optical amplifiers (-) at the first frequency (f), the one or more optical amplifiers (-) producing one or more continuous-wave output fields (-) for the injection-locked laser system (, ) at the first frequency (f)'}{'b': 7', '8', '8', '12', '1', '25, 'i': d', 'f', 'd', 'f', 'd', 'f, 'sub': 2', '2, 'and the second seed optical field () provides an input to injection lock one or more optical amplifiers (-) at the second ...

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Номер записи: 57

11-02-2016 дата публикации

Distributed Raman Amplifier Systems

Номер: US20160043527A1

Автор: Hochhalter David

Принадлежит: Mox Networks, LLC

A distributed Raman amplifier system is disclosed. Distributed Raman amplifier systems can include a spool of fiber disposed between a distributed Raman amplifier and local or proximate optical point-loss sources, a carrier hotel for example. The spool of fiber has a fiber of sufficient length to offset aggregated losses, which prevents the distributed Raman amplifier from shutting down while also allowing the distributed Raman amplifier to achieve entitled gain by pumping the fiber in the spool. 1. A distributed Raman amplifier system comprising:a distributed Raman amplifier configured to detect observed optical losses of a transmission line via a pulse and to pump the transmission line when the observed optical losses satisfy optical threshold criteria; anda spool of fiber disposed between and coupled with the distributed Raman amplifier and a set of optical point-loss sources, the spool having sufficient fiber length to offset aggregated losses from the set of optical point-loss sources and with respect to the pulse by causing the observed optical losses observed by the distributed Raman amplifier to satisfy the optical threshold criteria.2. The system of claim 1 , wherein the optical threshold criteria includes a condition that the aggregated point losses are no greater than 2 dB.3. The system of claim 2 , wherein the optical threshold criteria includes a condition that a single point-loss has loss of no greater than 1 dB.4. The system of claim 1 , wherein the aggregated losses comprise multiple point-losses that are at least 2 dB.5. The system of claim 1 , further comprising the set of optical point-loss sources proximate to the distributed Raman amplifier wherein claim 1 , in aggregate claim 1 , the set of optical point-loss sources comprise the aggregated losses and wherein the aggregated losses fail to satisfy the optical threshold criteria.6. The system of claim 5 , wherein at least some of the optical point-loss sources in the set of optical point-loss ...

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Номер записи: 58

08-02-2018 дата публикации

Reducing the Pulse Repetition Frequency of a Pulsed Laser System

Номер: US20180041001A1

Автор: Jens Limpert, Marco Plötner, Oliver de Vries

Принадлежит: Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV

The invention relates to a method for generating a laser pulse train, comprising the following method steps: generating the laser pulse train ( 4 a ) at a pulse repetition frequency; coupling the laser pulse train ( 4 a ) into an acousto-optical modulator, and selecting individual laser pulses of the laser pulse train ( 4 a ) by driving the acousto-optical modulator with high-frequency pulses ( 4 h ), wherein the high-frequency pulses ( 4 h ) are generated by modulating a high-frequency carrier signal ( 4 f ) with a periodic switching signal ( 4 e ). In addition, the invention relates to a system for generating a laser pulse train, comprising a pulsed laser ( 1 ), which generates the laser pulse train at a pulse repetition frequency, and an acousto-optical modulator ( 2 ), in which the laser pulses propagate, and comprising a control device ( 7 ), which drives the acousto-optical modulator ( 2 ) with high-frequency pulses for the purpose of selecting individual laser pulses. It is an object of the invention to provide an improved method for selecting individual laser pulses from a laser pulse train. The intensity noise known from the prior art is intended to be reduced. The invention achieves this object by virtue of the fact that the following holds true for the frequency f HF of the carrier signal ( 4 f ) of the high-frequency pulses ( 4 h ): f HF =n/p·f PRF , wherein n is an arbitrary natural number and p indicates the integral ratio between the pulse repetition frequency and the frequency of the switching signal ( 4 e ), and wherein the carrier signal ( 4 f ) is coupled to the laser pulse train ( 4 a ) in a phase-stable manner.

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Номер записи: 59

12-02-2015 дата публикации

Object information acquiring apparatus, laser apparatus, and medical apparatus

Номер: US20150045778A1

Автор: Shigeru Ichihara

Принадлежит: Canon Inc

An object information acquiring apparatus is used which includes a laser medium that oscillates laser light, an excitation source that excites the laser medium, a voltage accumulator that applies a voltage to the excitation source, a voltage supplier that supplies a voltage to the voltage accumulator, a voltage controller that limits a maximum supplied voltage from the voltage supplier, a receiver that receives a photoacoustic wave generated by an object irradiated with the laser light, and a constructor that acquires characteristic information relating to the object in use of the photoacoustic wave, wherein the voltage controller compares a measured voltage value obtained by implementing division of a supplied voltage from the voltage supplier with a reference voltage value defining the maximum supplied voltage.

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Номер записи: 60

07-02-2019 дата публикации

WAVELENGTH LOCKER, WAVELENGTH TUNABLE LASER APPARATUS, AND METHOD FOR CONTROLLING WAVELENGTH TUNABLE LASER APPARATUS

Номер: US20190044300A1

Автор: Akiyama Suguru, TAKABAYASHI Kazumasa

Принадлежит: FUJITSU LIMITED

A wavelength locker includes a splitter configured to split a portion of light that is output from a light source into a first monitoring light and a second monitoring light; a first periodic filter configured to receive the first monitoring light; a second periodic filter configured to receive the second monitoring light; a first optical receiver configured to monitor an intensity of light that has passed through the first periodic filter; and a second optical receiver configured to monitor an intensity of light that has passed through the second periodic filter, wherein the first periodic filter and the second periodic filter each has a wavelength characteristic in which an intensity of transmitted light changes periodically with respect to a wavelength, and the wavelength characteristic of the first periodic filter and the wavelength characteristic of the second periodic filter shift in opposite wavelength directions when temperature changes. 1. A wavelength locker , comprising:a splitter configured to split a portion of light that is output from a light source into a first monitoring light and a second monitoring light;a first periodic filter configured to receive the first monitoring light;a second periodic filter configured to receive the second monitoring light;a first optical receiver configured to monitor an intensity of light that has passed through the first periodic filter; anda second optical receiver configured to monitor an intensity of light that has passed through the second periodic filter,wherein the first periodic filter and the second periodic fitter each has a wavelength characteristic in which an intensity of transmitted light changes periodically with respect to a wavelength, andthe wavelength characteristic of the first periodic filter and the wavelength characteristic of the second periodic filter shift in opposite wavelength directions when temperature changes.2. The wavelength locker according to claim 1 ,wherein the first periodic filter ...

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Номер записи: 61

18-02-2021 дата публикации

DEVICE AND METHOD FOR GENERATING LASER PULSES BY KERR LENS BASED MODE LOCKING WITH A LOSS-MODULATION DEVICE AS A KERR MEDIUM

Номер: US20210050701A1

Автор: BRONS Jonathan, GROEBMEYER Sebastian, Krausz Ferenc, Pronin Oleg

Принадлежит:

A laser device (), being configured for generating laser pulses by Ken lens based mode locking, comprises a laser resonator () with a plurality of resonator mirrors () spanning a resonator beam path (), a solid state gain medium () being arranged in the laser resonator (), a Kerr medium device () being arranged with a distance from the gain medium () in the laser resonator (), wherein the Kerr medium device () includes at least one Ken medium being arranged in a focal range of the resonator beam path and being configured for forming the laser pulses by the nonlinear Kerr effect, and a loss-modulation device () having a modulator medium, which is capable of modulating a power loss of the laser pulses generated in the laser resonator (), wherein the Kerr medium device () includes the modulator medium of the loss-modulation device () as the at least one Kerr medium having an optical non-linearity being adapted for both of creating the Kerr lens based mode-locking in the laser resonator and modulating the power loss in the laser resonator. Furthermore, a method of generating laser pulses by Kerr lens based mode locking is described, wherein a loss-modulation device () is used for both of introducing a Ken effect in the laser resonator () and modulating the power loss. 126-. (canceled)27. Laser device being configured for generating laser pulses by Kerr lens based mode locking , comprisinga laser resonator with a plurality of resonator mirrors spanning a resonator beam path,a solid state gain medium being arranged in the laser resonator,a Kerr medium device being arranged with a distance from the gain medium in the laser resonator, wherein the Kerr medium device includes at least one Kerr medium being arranged in a focal range of the resonator beam path and being configured for forming the laser pulses by the nonlinear Kerr effect, anda loss-modulation device having a modulator medium, which is capable of modulating a power loss of the laser pulses generated in the laser ...

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Номер записи: 62

18-02-2021 дата публикации

LASER APPARATUS AND MONITORING METHOD

Номер: US20210050702A1

Автор: KASHIWAGI Masahiro, Wang Yu

Принадлежит: FUJIKURA LTD.

A laser apparatus includes: a monitoring device that includes a detector that detects light belonging to a first wavelength range including a peak wavelength of at least one of Stokes light and anti-Stokes light, in preference to light belonging to a second wavelength range; and a multi-mode fiber. The Stokes light and the anti-Stokes light result from, in the multi-mode fiber that guides laser light, four-wave mixing in which a plurality of guide modes are involved. 125.-. (canceled)26. A laser apparatus comprising:a monitoring device comprising a detector that detects light belonging to a first wavelength range including a peak wavelength of at least one of Stokes light and anti-Stokes light, in preference to light belonging to a second wavelength range; anda multi-mode fiber, whereinin the multi-mode fiber that guides laser light, the Stokes light and the anti-Stokes light result from four-wave mixing in which a plurality of guide modes are involved.27. The laser apparatus according to claim 26 , whereinin the four-wave mixing, a fundamental mode component and a higher order mode component of the laser light are pump light; and{'sub': s', 'as, 'claim-text': [{'br': None, 'sub': s', 'as', 'p, 'Ω+ω=2ω\u2003\u2003(1),'}, {'br': None, 'sub': s', 'as', 'p', 'p, 'i': 'P+P', 'β(ω)+β′(ω)=β′(ω)+β(ω)−γ(′)\u2003\u2003(2a), and'}, {'br': None, 'sub': s', 'as', 'P', 'P, 'i': 'P+P', 'β′(ω)+β(ω)=β′(ω)+β(ω)−γ(′)\u2003\u2003(2b),'}], 'a peak angular frequency ωof the Stokes light and a peak angular frequency ωof the anti-Stokes light satisfy the following equation (1) representing a frequency matching condition and the following equation (2a) or (2b) representing a phase matching condition,'} β(ω) is a propagation constant of the multi-mode fiber with regard to the fundamental mode component having an angular frequency ω,', 'β′(ω) is a propagation constant of the multi-mode fiber with regard to the higher order mode component having an angular frequency ω,', {'sub': 'p', 'ωis a ...

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Номер записи: 63

18-02-2021 дата публикации

ULTRAFAST LASER

Номер: US20210050703A1

Автор: CHEN Kangkang, HE Fei, XU Guruo, ZOU SI

Принадлежит: WUHAN YANGTZE SOTON LASER CO. LTD.

The present disclosure provides an ultrafast laser that outputs multiple wavelengths. The ultrafast laser includes a fundamental frequency ultrafast laser unit, an optical beam splitting and polarization controlling unit, a multiple frequency unit, and an optical beam combining unit. The fundamental frequency ultrafast laser generates a multiple frequency ultrafast laser by the multiple frequency unit, such as double frequency light, triple frequency light, etc., and the optical beam combining unit makes the fundamental frequency light and the double frequency light output in a light outlet, the controlling unit controls the wavelength of the laser of the light outlet by controlling the polarization state of the laser. The ultrafast laser of the present disclosure can realize fast switching output among the fundamental frequency light and multiple frequency light, and output of combined pulse fundamental frequency light and double frequency light. The present disclosure also provides a strong powerful laser tool. 1. An ultrafast laser that outputs multiple wavelengths , comprising:a fundamental frequency ultrafast laser unit configured to provide output of fundamental frequency light;an optical beam splitting and polarization controlling unit configured for optical beam splitting and controlling polarization state of light;a multiple frequency unit configured to generate multiple frequency ultrafast laser; andan optical beam combining unit configured to combine the fundamental frequency light and the multiple frequency light to make it output at one light outlet;wherein the fundamental frequency light emitted by the fundamental frequency ultrafast laser unit is divided into S-polarized light and P-polarized light after passing through the optical beam splitting and polarization controlling unit;wherein the P-polarized light enters the optical beam combining unit, the S-polarized light generate a multiple frequency effect after entering the multiple frequency unit, ...

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Номер записи: 64

06-02-2020 дата публикации

PHASE CALIBRATION METHOD AND LASER PROJECTOR

Номер: US20200044410A1

Автор: FAN Chang-Hsien

Принадлежит:

A phase calibration method includes: producing a synchronization signal; controlling switches of a light source based on a time series; measuring a first light intensity of the light passing through a phosphor wheel and a color wheel; changing phases of the phosphor wheel or the color wheel; measuring a second light intensity of the light passing through the phosphor wheel and the color wheel; changing the phases of the phosphor wheel or the color wheel again; measuring a third light intensity of the light passing through the phosphor wheel and the color wheel; repeating changing the phases if the second light intensity is greater than the first light intensity, and the third light intensity is greater than the second light intensity; or when the second light intensity is smaller than the first light intensity, and the third light intensity is greater than the first light intensity. 1. A phase calibration method applied for a laser projector , the phase calibration method comprising steps of:(a) transmitting, by a processor, a synchronization signal to a laser driver;(b) controlling, by the laser driver, switches of a laser light source based on a time series of the synchronization signal;(c) measuring, by a light sensor, a first light intensity of a laser light of the laser light source having sequentially passed through a phosphor wheel and a color wheel;(d) changing a phase of the phosphor wheel or a phase of the color wheel;(e) measuring, by the light sensor, a second light intensity of the laser light of the laser light source having sequentially passed through the phosphor wheel and the color wheel; (f1) decreasing the phase of the phosphor wheel or the phase of the color wheel, if the first light intensity is greater than the second light intensity, and the phase of the phosphor wheel or the phase of the color wheel is increased in step (d); or', '(f2) decreasing the phase of the phosphor wheel or the phase of the color wheel, if the first light intensity is ...

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Номер записи: 65

16-02-2017 дата публикации

Optical Scanning

Номер: US20170047705A1

Автор: Brodschelm Andreas, Puppe Thomas A., Rausch Christian, Vieweg Nico

Принадлежит: TOPTICA PHOTONICS AG

The invention relates to an apparatus for generating temporally spaced apart light pulses, comprising 230281112. Apparatus according to claim 1 , wherein the mechanical oscillator comprises a first actuator claim 1 , in particular a piezo-actuator () claim 1 , which carries a reflective optical element () and claim 1 , by translation of same claim 1 , adjusts the resonator length of at least one of the first laser () and the second laser ().3. Apparatus according to claim 1 , further comprising a first control loop with{'b': 17', '18, 'a phase detector () which derives a phase signal () from the first light-pulse sequence (I) and the second light-pulse sequence (II), and'}{'b': 19', '21', '21, 'a first controller () which forms a first actuating signal () from the phase signal, applies the first actuating signal () to the actuating member and thus regulates the time offset between the first light-pulse sequence (I) and the second light-pulse sequence (II).'}422212425. Apparatus according to claim 3 , further comprising a superposition member () which superposes the first actuating signal () and the modulation signal () and applies the superposed signal () to the actuating member.531111221. Apparatus according to claim 3 , wherein the actuating member comprises a second actuator claim 3 , in particular a piezo-actuator () which likewise changes the resonator length of at least one of the first laser () and the second laser () claim 3 , wherein the controller only applies the first actuating signal () to the second actuator.6283031. Apparatus according to claim 5 , wherein the first actuator and the second actuator are arranged in a stack such that the translation of the reflective optical element () corresponds to the sum of the deflections of the two actuators ( claim 5 , ).7. Apparatus according to claim 1 , further comprising a second control loop with{'b': '30', 'a deflection sensor which detects the amplitude of the oscillation of the first actuator () and'}{'b ...

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Номер записи: 66

15-02-2018 дата публикации

SYSTEMS AND METHODS FOR LOW NOISE FREQUENCY MULTIPLICATION, DIVISION, AND SYNCHRONIZATION

Номер: US20180048113A1

Автор: FERMANN Martin E., Kuse Naoya

Принадлежит:

Low phase noise radio frequency (RF) sources generated by voltage controlled oscillators (VCOs) are described. Optical modulators driven by a VCO may be used to generate optical side-bands to cw lasers. The spectral extent of said side-bands can be increased via frequency broadening in highly nonlinear waveguides. Free running mode locked low phase noise comb oscillators can be used as reference oscillators to generate beat signals between those side-bands and individual comb modes at distal spectral regions, thereby creating an error signal used to reduce the phase noise of VCOs and the generation of low phase noise RF signals. VCO phase noise may be reduced by using free-running modelocked comb lasers phase locked to external frequency references, by omitting a reference comb and using a nonlinear interferometer for generating an error signal, or by locking a slave comb to the modulation frequency of an intra-cavity modulator driven by the VCO. 1. A source of low phase noise microwave frequencies , the source comprising:a mode locked comb laser;a continuous wave (cw) laser,said cw laser configured to be modulated with an optical modulator,wherein said optical modulator is configured to be driven by a micro-wave frequency generated with a controllable microwave generator,said optical modulator configured to generate side-bands to the cw laser in the frequency domain with a frequency spacing given by the modulation frequency of the optical modulator;a nonlinear medium to nonlinearly broaden the spectral extent of said side-bands,a detector arrangement configured to detect primary beat signals between two individual comb modes from said comb laser with the frequency side-bands from the cw laser,a radio frequency (RF) mixer configured to mix said two primary beat signals thereby generating a secondary beat signal,said secondary beat signal comprising amplified phase noise from said micro-wave frequency generated by said controllable microwave generator; anda servo ...

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Номер записи: 67

14-02-2019 дата публикации

Relative phase measurement for coherent combining of laser beams

Номер: US20190052045A1

Автор: Matthias Haefner, Thomas Metzger

Принадлежит: Trumpf Scientific Lasers GmbH and Co KG

A phase control system for controlling the relative phase (φ) of two laser beams of a laser system, which are to be coherently combined, is disclosed that enables providing a phase-controlled sum laser beam. An optical system of the phase control system includes a beam input for receiving a measuring portion of two collinear coherent laser beams, which are superimposed to form a sum laser beam, and provides measuring beams or measuring beam regions, which are used with associated photodetectors for outputting photodetector signals. For determining the relative phase from the photodetector signals, the phase control system has an evaluation device and a delay device for being inserted into the beam path of at least one of the two laser beams. The optical system is configured such that the measuring beams or measuring beam regions are related to different phase offsets.

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Номер записи: 68

14-02-2019 дата публикации

OPTICAL TRANSMISSION SYSTEM, CONTROL APPARATUS OF WAVELENGTH SELECTIVE SWITCH, AND INSERTION LOSS CORRECTION METHOD

Номер: US20190052356A1

Автор: Inoue Takanori

Принадлежит: NEC Corporation

A multiplexer inserts a dummy signal light into a main signal. A light intensity monitor acquires the intensity of the light of each wavelength of a light output from a wavelength selective switch. A light source controller controls the insertion of the dummy signal light into the main signal, and release of the insertion. A difference calculator calculates the difference between a first light intensity that has been acquired in a state in which the dummy signal light is inserted into the main signal and a second light intensity that has been acquired in a state in which the dummy signal light is not inserted into the main signal. An insertion loss calculator calculates an insertion loss in the wavelength selective switch based on the calculated difference. An insertion loss controller controls the insertion loss in the wavelength selective switch based on the calculated insertion loss. 1. An optical transmission system comprising:a wavelength selective switch;a light source configured to generate a dummy signal light;a multiplexer configured to multiplex a main signal in which optical signals having a plurality of wavelengths are multiplexed with the dummy signal light, and output the main signal into which the dummy signal light is inserted to the wavelength selective switch;a light intensity monitor configured to acquire the intensity of the light of each wavelength of a light output from the wavelength selective switch;a light source controller configured to control insertion of the dummy signal light into the main signal and release of the insertion;a difference calculator configured to calculate a difference between a first light intensity that the light intensity monitor has acquired in a state in which the dummy signal light is inserted into the main signal and a second light intensity that the light intensity monitor has acquired in a state in which the dummy signal light is not inserted into the main signal;an insertion loss calculator configured to ...

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Номер записи: 69

25-02-2021 дата публикации

FAST INTENSITY STABILIZATION OF MULTIPLE CONTROLLER BEAMS WITH CONTINUOUS INTEGRATING FILTER

Номер: US20210057872A1

Автор: MIZRAHI Jonathan Albert, PISENTI Neal

Принадлежит:

Aspects of the present disclosure describe techniques for fast stabilization of multiple controller beams with continuous integrating filter. For example, a method is described for intensity stabilization of laser beams (e.g., ion controller beams) in a trapped ion system, where the method includes applying a linear array of laser beams to respective ions in a linear array of ions in a trap, performing, in response to the laser beams being applied, parallel measurements on the ions, the parallel measurements including multiple, separate measurements on each of the ions to identify fluctuations in intensity in the respective laser beams at each ion, and adjusting the intensity of one or more of the laser beams in response to fluctuations being identified from the parallel measurements. A corresponding system for intensity stabilization of laser beams in a trapped ion system is also described. 1. A method for intensity stabilization of laser beams in a trapped ion system , comprising:applying a linear array of laser beams to respective ions in a linear array of ions in a trap;performing, in response to the laser beams being applied, parallel measurements on the ions, the parallel measurements including multiple, separate measurements on each of the ions to identify fluctuations in intensity in the respective laser beams at each ion; andadjusting the intensity of one or more of the laser beams in response to fluctuations being identified from the parallel measurements.2. The method of claim 1 , wherein each of the multiple claim 1 , separate measurements on a particular ion is a measurement of a response of that ion to the respective laser beam.3. The method of claim 1 , wherein performing the parallel measurements includes performing an integration of the multiple claim 1 , separate measurements on each of the ions to identify fluctuations in intensity in the respective laser beams.4. The method of claim 1 , wherein for each of the multiple claim 1 , separate ...

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Номер записи: 70

13-02-2020 дата публикации

LASER APPARATUS

Номер: US20200052456A1

Автор: MIYATA Ryusuke, TAKIGAWA Hiroshi

Принадлежит: FANUC Corporation

A laser apparatus calculates a temperature of a temperature increase portion that is raised in temperature by reflection light, and determines and outputs an emergency optical output command with the aim of ensuring that the calculated temperature does not exceed a first predetermined temperature, which is set at a lower temperature than an upper limit heat resistance temperature, and if necessary, controlling the temperature to or below a second predetermined temperature set at a lower temperature than the first predetermined temperature. When the emergency optical output command is to be output, a control unit switches an optical output command output thereby to the emergency optical output command and outputs the emergency optical output command. 1. A laser apparatus , comprising:at least one laser oscillator;a power supply unit for supplying a driving current to the laser oscillator;a laser optical system that includes a machining head for irradiating a workpiece serving as a laser machining subject with laser light emitted from the laser oscillator through an optical fiber;at least one light detecting unit capable of detecting the laser light emitted from the laser oscillator and reflection light propagating in a substantially opposite direction to the laser light; anda control unit that outputs an optical output command and a current output command corresponding to the optical output command to the power supply unit,the laser apparatus further comprising:a temperature calculation unit that is provided either inside the laser apparatus or outside the laser apparatus and uses a detection result acquired by the light detecting unit to calculate the temperature of at least one of respective temperature increase portions of the laser apparatus, which increase in temperature in response to the reflection light; andan emergency command determination unit that refers to the calculated temperature of the temperature increase portion, calculated by the temperature ...

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Номер записи: 71

13-02-2020 дата публикации

DISTRIBUTED RAMAN AMPLIFIER SYSTEMS

Номер: US20200052457A1

Автор: Hochhalter David

Принадлежит:

A smart spool is configured to be optically coupled between a pumping light source and optical point-loss sources in an optical fiber transmission line. The smart spool comprises a probe signal transmitter that transmits an optical probe signal into the transmission line. An optical detector receives probe signals scattered in the transmission line. A loss-measuring device is coupled to the optical detector and operable to measure aggregate losses in the transmission line and report the aggregate losses to a network manager. The spool comprises a fiber of sufficient length to offset the aggregated losses to enable a distributed Raman amplifier to pump the transmission line. The smart spool prevents the distributed Raman amplifier from shutting down and allows the distributed Raman amplifier to achieve entitled gain by pumping the fiber in the spool. 120-. (canceled)21. A Raman amplifier system comprising:a Raman amplifier configured to detect observed optical losses of a transmission line via a pulse and to pump the transmission line when the observed optical losses satisfy optical threshold criteria; anda length of fiber coupled with the Raman amplifier, wherein the length of fiber is configured to offset aggregated losses from at least one optical point-loss source by causing the observed optical losses observed by the Raman amplifier to satisfy the optical threshold criteria.22. The system of claim 21 , wherein the optical threshold criteria includes a condition that the aggregated losses are no greater than 2 dB.23. The system of claim 22 , wherein the optical threshold criteria includes a condition that a single point-loss has a loss of no greater than 1 dB.24. The system of claim 21 , wherein the aggregated losses comprise multiple point-losses that are at least 2 dB.25. The system of claim 21 , further comprising a set of optical point-loss sources proximate to the Raman amplifier wherein claim 21 , in aggregate claim 21 , the set of optical point-loss ...

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Номер записи: 72

05-03-2015 дата публикации

Reducing thermal dependence of amplifier gain

Номер: US20150062692A1

Автор: Lijie Qiao

Принадлежит: Individual

Devices and methods for lessening a thermal dependence of gain profile of an optical amplifier are disclosed. An optical beam is split in two sub-beams with a thermally variable power splitting ratio. One sub-beam travels a longer optical path length than the other. When the two sub-beams are recombined, they interfere with each other, causing the throughput to be wavelength dependent. An amplitude of this wavelength dependence is thermally variable due to the thermally variable power splitting ratio. The thermally variable power splitting ratio and the optical path length difference are selected so as to offset a thermal variation of a spectral gain profile of an optical amplifier.

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Номер записи: 73

01-03-2018 дата публикации

RADIATION SENSOR APPARATUS

Номер: US20180058928A1

Автор: Banine Vadim Yevgenyevich, BECKERS Job, BRUSSAARD Gerrit Jacobus Hendrik, KOPPERT Willem Jakobus Cornelis, Luiten Otger Jan, NIENHUYS Han-Kwang, VAN DER HORST Ruud Martinus

Принадлежит: ASML Netherlands B.V.

A radiation sensor apparatus for determining a position and/or power of a radiation beam, the radiation sensor apparatus including a chamber to contain a gas, one or more sensors, and a processor. The chamber has a first opening and a second opening such that a radiation beam can enter the chamber through the first opening, propagate through the chamber generally along an axis, and exit the chamber through the second opening. Each of the one or more sensors is arranged to receive and detect radiation emitted from a region of the chamber around the axis. The processor is operable to use the radiation detected by the one or more sensors to determine a position and/or power of the radiation beam. 1. A radiation sensor apparatus for determining a position and/or power of a radiation beam , the radiation sensor apparatus comprising:a chamber configured to contain a gas, the chamber having a first opening and a second opening such that a radiation beam can enter the chamber through the first opening, propagate through the chamber generally along an axis, and exit the chamber through the second opening;one or more sensors, each arranged to receive and detect secondary radiation emitted from the gas in a region of the chamber around the axis; anda processor configured to use the secondary radiation detected by the one or more sensors to determine a position and/or power of the radiation beam.2. The radiation sensor apparatus of claim 1 , wherein the one or more sensors comprise filtering optics arranged to filter out one or more bands of radiation.3. The radiation sensor apparatus of claim 1 , comprising two sensors claim 1 , each sensor being arranged to receive and detect secondary radiation emitted from the region of the chamber around the axis in a different direction.4. The radiation sensor apparatus of claim 3 , wherein the two sensors are arranged to receive and detect secondary radiation emitted from the region of the chamber around the axis in two generally ...

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Номер записи: 74

04-03-2021 дата публикации

METHOD AND SYSTEM FOR CALIBRATING LASER POWER

Номер: US20210063239A1

Автор: Chang Pei-Ming, CHAO PAO-CHUNG, Hsu Shih-Chieh, HUANG WEI-LUNG, Shen Wen-Chih

Принадлежит:

Disclosures of the present invention describe a method for calibrating laser power. During a laser power calibration of a laser optics product, reference intensity data and reference power data are adopted for generating a reference trend line with a Rvalue that is equal to 1. As such, real intensity data that have a residual value smaller than a threshold value are adopted for generating a first trend line in combination with real power data. Moreover, the real intensity data that have a residual value greater than the threshold value are utilized for generating a second trend line in combination with corresponding real power data. Consequently, under an assistance of a predict trend line constituted by the first trend line and the second trend line, the laser power calibration is therefore completed after the laser optics product successively emits a laser beam by a few times. 1. A method for calibrating laser power , comprising following steps:(1) letting a laser optics product successively emits a laser light by a plurality of times, so as to receive the laser light by using a light receiving unit;(2) configuring a controlling and processing device to record a plurality of real intensity data and a plurality of real power data in a data storage unit thereof, wherein the respective real intensity data and real power data are measured from the respective laser lights that are emitted by the laser optics product in the respective times;(3) configuring the controlling and processing device to generate a reference trend line based on a plurality of reference intensity data and a plurality of reference power data, wherein the reference trend line has a coefficient of determination that is equal to 1;(4) configuring the controlling and processing device to apply a first linear regression process to the plurality of real intensity data and the plurality of real power data for producing a first linear regression graph, thereby adding the reference trend line in the first ...

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Номер записи: 75

03-03-2016 дата публикации

LESSENING VARIATIONS OF SPECTRAL CHARACTERISTIC OF AN OPTICAL DEVICE

Номер: US20160064890A1

Автор: QIAO Lijie

Принадлежит:

Devices and methods for lessening a thermal dependence of gain profile of an optical amplifier are disclosed. An optical beam is split in a plurality of sub-beams with a thermally variable power splitting ratio, e.g. one sub-beam may travel a longer optical path length than another. When the sub-beams are recombined, they interfere with each other, causing the throughput to be wavelength dependent. An amplitude of this wavelength dependence is thermally variable due to the thermally variable power splitting ratio. The thermally variable power splitting ratio and the optical path length difference are selected so as to offset a thermal variation of a spectral gain profile of an optical amplifier. 1. An apparatus comprising:a first polarizer having a polarization axis oriented in an X-direction, for polarizing an input optical beam to obtain a first optical beam having a polarization oriented in the X-direction;a first polarization rotator optically coupled to the first polarizer and configured for rotating the polarization of the first optical beam away from the X-direction by a first angle having a pre-defined dependence on temperature, such that the polarized optical beam comprises an X-polarization component oriented in the X direction, and a Y-polarization component oriented in a Y-direction perpendicular to the X-direction;a first waveplate optically coupled to the first polarization rotator and having an optical axis oriented substantially in the X-direction or Y-direction, for imparting a non-zero phase shift between the X- and Y-polarization components of the first optical beam;a second polarization rotator optically coupled to the first waveplate and configured for rotating the polarization of the first optical beam by the first angle back to become oriented in the X-direction; anda second polarizer optically coupled to the second polarization rotator and having a polarization axis oriented in the X-direction, for polarizing the first optical beam to obtain ...

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Номер записи: 76

03-03-2016 дата публикации

Device For Reducing Optical Feedback Into Laser Amplifier

Номер: US20160064893A1

Автор: Bhawalkar Jayant D., Clancy Michael, Qiu Jinze, Shang Xiaoming

Принадлежит:

A device for reducing spontaneous emission in laser oscillator laser amplifier laser system. 1. A device comprisinga plate with a reflecting or absorbing surface oriented at an angle to optical axis of a laser oscillator-laser amplifier optical system and configured to angularly separate from path of laser beam generated by a laser oscillator from spontaneous emission emitted by the laser amplifier;an aperture located on the reflecting surface and configured to transmit a laser beam generated by the laser oscillator; andwherein optical axis of the aperture coincides with the optical axis of the laser-oscillator-laser-amplifier optical system.2. The device according to claim 1 , wherein the angle between the reflecting surface and the optical axis of the laser oscillator laser amplifier optical system is 1 degree to 90 degrees with respect to the optical axis of the laser oscillator laser amplifier optical system.3. The device according to claim 1 , wherein the plate with a reflecting surface oriented at an angle to optical axis of a laser oscillator laser amplifier optical system is located between the laser oscillator and laser amplifier.4. The device according to claim 1 , wherein the plate with a reflecting surface is one of a group of plates consisting of a polished metal plate with an aperture claim 1 , a glass plate coated by a high-reflection dielectric coating with an aperture located in a center of the plate and coated by an antireflection-coating claim 1 , or a laser radiation absorbing plate with a hole where beam emitted by laser oscillator passes through.5. The device according to claim 1 , wherein the reflecting surface of the plate is one of a group of surfaces consisting of flat claim 1 , convex claim 1 , or concave surface.6. The device according to claim 1 , wherein the plate with a reflecting surface oriented at an angle to optical axis includes a cooling arrangement and wherein the cooling arrangement is one of a group of arrangement consisting ...

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Номер записи: 77

20-02-2020 дата публикации

METHOD AND SYSTEM FOR COMPACT EFFICIENT LASER ARCHITECTURE

Номер: US20200059064A1

Автор: Bayramian Andrew James, Caird John, Deri Robert J., Erlandson Al, Manes Kenneth, Spaeth Mary

Принадлежит: Lawrence Livermore National Security, LLC

A laser amplifier module having an enclosure includes an input window, a mirror optically coupled to the input window and disposed in a first plane, and a first amplifier head disposed along an optical amplification path adjacent a first end of the enclosure. The laser amplifier module also includes a second amplifier head disposed along the optical amplification path adjacent a second end of the enclosure and a cavity mirror disposed along the optical amplification path. 111-. (canceled)12. A method of amplifying a laser beam , the method comprising:receiving an input beam;directing the input beam along a first direction;amplifying the input beam a first time using a set of amplifiers, wherein amplification paths through the set of amplifiers are disposed along a second direction substantially orthogonal to the first direction;reflecting the amplified beam using a first cavity mirror;amplifying the amplified beam a second time using the set of amplifiers;image relaying the twice amplified beam along the first direction;reflecting the twice amplified beam using a second cavity mirror;amplifying the twice amplified beam a third time using the set of amplifiers;reflecting the three times amplified beam using the first cavity mirror;amplifying the three times amplified beam using the set of amplifiers; andoutputting the four times amplified beam.13. The method of wherein the input beam and the four times amplified beam are characterized by a linear polarization.14. The method of wherein the amplified beam claim 13 , the twice amplified beam claim 13 , and the three times amplified beam are characterized by circular polarization.15. The method of further comprising rotating a polarization state of the twice amplified beam using a Pockels cell.16. The method of wherein the first cavity mirror comprises a deformable mirror.17. The method of further comprising performing image relaying between the set of amplifiers.18. The method of further comprising amplifying the three ...

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Номер записи: 78

01-03-2018 дата публикации

OPHTHALMIC ILLUMINATION SYSTEM WITH CONTROLLED CHROMATICITY

Номер: US20180062344A1

Автор: Smith Ronald T.

Принадлежит:

An ophthalmic illumination system includes a broadband light source configured to emit a white laser beam, a first monochromatic light source configured to emit a first monochromatic laser beam having a first central wavelength, optics configured to receive a combined light beam comprising the white laser beam and the monochromatic laser, and a controller comprising a processor and a memory configured to control a chromaticity of the combined light beam by changing an output power of the first monochromatic light source. 1. An ophthalmic illumination system , comprising:a broadband light source configured to emit a white laser beam;a first monochromatic light source configured to emit a first monochromatic laser beam having a first central wavelength;optics configured to receive a combined light beam comprising the white laser beam and the monochromatic laser; anda controller comprising a processor and a memory configured to control a chromaticity of the combined light beam by changing an output power of the first monochromatic light source.2. The ophthalmic illumination system of claim 1 , wherein the controller is configured to change the output power of the first monochromatic light source based on an operating time of the broadband light source.3. The ophthalmic illumination system of claim 1 , further comprising a plurality of chromaticity sensors configured to measure a chromaticity of the combined light beam; andwherein the controller is further configured to:receive a signal from the chromaticity sensors indicating a measured chromaticity of the combined light beam;determine that the measured chromaticity is not within a target chromaticity range;calculate an output power adjustment for the first monochromatic light source that will modify chromaticity of the combined light beam to fall within the target chromaticity range; andgenerate a signal to change the output power of the first monochromatic light source, based on the calculated output power adjustment ...

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Номер записи: 79

02-03-2017 дата публикации

LASER SYSTEM

Номер: US20170063024A1

Автор: ARAKAWA Masaki, KAKIZAKI Kouji, MATSUNAGA Takashi, Wakabayashi Osamu

Принадлежит: Gigaphoton Inc.

The laser system may include a first laser apparatus configured to emit a first pulse laser beam, a second laser apparatus configured to emit a second pulse laser beam, a timing detector, and a controller. The timing detector may be configured to detect a first passage timing at which the first pulse laser beam passes a first position and a second passage timing at which the second pulse laser beam passes a second position. The controller may be configured to control a first trigger timing for the first laser apparatus to emit the first pulse laser beam and a second trigger timing for the second laser apparatus to emit the second pulse laser beam based on the first passage timing and the second passage timing. 1. A laser system comprising:a first laser apparatus configured to emit a first pulse laser beam;a second laser apparatus configured to emit a second pulse laser beam;a timing detector; anda controller, whereinthe timing detector is configured to detect a first passage timing at which the first pulse laser beam passes a first position and a second passage timing at which the second pulse laser beam passes a second position, andthe controller is configured to control a first trigger timing for the first laser apparatus to emit the first pulse laser beam and a second trigger timing for the second laser apparatus to emit the second pulse laser beam based on the first passage timing and the second passage timing.2. A laser system comprising:a first discharge-pumped laser apparatus configured to emit a first pulse laser beam;a second discharge-pumped laser apparatus configured to emit a second pulse laser beam;a timing detector; anda controller, whereinthe timing detector is configured to detect a first timing of electric discharge occurred for emitting the first pulse laser beam from the first laser apparatus and detect a second timing of electric discharge occurred for emitting the second pulse laser beam from the second laser apparatus, andthe controller is ...

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Номер записи: 80

02-03-2017 дата публикации

LASER SYSTEM

Номер: US20170063025A1

Автор: ARAKAWA Masaki, KAKIZAKI Kouji, Wakabayashi Osamu

Принадлежит: Gigaphoton Inc.

The laser system may include a plurality of laser apparatuses, a beam delivery device configured to bundle pulse laser beams emitted from respective laser apparatuses of the plurality of laser apparatuses to emit a bundled pulse laser beam, and a beam parameter measuring device provided in an optical path of the bundled pulse laser beam to measure a beam parameter of each one of the pulse laser beams and a beam parameter of the bundled pulse laser beam. 1. A laser system comprising:a plurality of laser apparatuses;a beam delivery device configured to bundle pulse laser beams emitted from respective laser apparatuses of the plurality of laser apparatuses to emit a bundled pulse laser beam; anda beam parameter measuring device provided in an optical path of the bundled pulse laser beam to measure a beam parameter of each one of the pulse laser beams and a beam parameter of the bundled pulse laser beam.2. The laser system according to claim 1 , whereinthe beam parameter measuring device includes a selecting mechanism, the selecting mechanism being configured to select at least one of the pulse laser beams, the beam parameter measuring device being configured to measure the beam parameter of each one of the at least one of the pulse laser beams.3. The laser system according to claim 1 , whereinthe beam parameter measuring device includes an image sensor and a selecting mechanism, the selecting mechanism being configured to select at least one of the pulse laser beams to have the at least one of the pulse laser beams enter the image sensor, the image sensor being configured to measure the beam parameter of each one of the at least one of the pulse laser beams.4. The laser system according to claim 1 , further comprising:beam steering devices provided in respective optical paths between the respective laser apparatuses and the beam parameter measuring device; anda controller configured to control the beam steering devices based on measurement result of the beam parameter ...

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Номер записи: 81

12-03-2015 дата публикации

LASER WITH TRANSMISSION AND REFLECTION MODE FEEDBACK CONTROL

Номер: US20150070707A1

Автор: Qiu Tiequn, Sanders Glen A., Strandjord Lee K.

Принадлежит:

One embodiment is directed towards a stabilized laser including a laser to produce light at a frequency and a resonator coupled to the laser such that the light from the laser circulates therethrough. The laser also includes Pound-Drever-Hall (PDH) feedback electronics configured to adjust the frequency of the light from the laser to reduce phase noise in response to light sensed at the reflection port of the resonator and transmission port feedback electronics configured to adjust the frequency of the light from the laser toward resonance of the resonator at the transmission port in response to the light sensed at the transmission port of the resonator, wherein the transmission port feedback electronics adjust the frequency at a rate at least ten times slower than the PDH feedback electronics. 1. A stabilized laser comprising:a laser to produce light at a frequency;a resonator coupled to the laser such that the light from the laser circulates therethrough;Pound-Drever-Hall (PDH) feedback electronics configured to adjust the frequency of the light from the laser to reduce phase noise in response to light sensed at the reflection port of the resonator; andtransmission port feedback electronics configured to adjust the frequency of the light from the laser toward resonance of the resonator at the transmission port in response to the light sensed at the transmission port of the resonator, wherein the transmission port feedback electronics adjust the frequency at a rate at least ten times slower than the PDH feedback electronics.2. The stabilized laser of claim 1 , wherein the light from the laser is modulated with a PDH modulation signal at a first frequency and transmission mode modulation signal at a second frequency claim 1 , wherein the first frequency is within the range of 1-100 MHz and wherein the second frequency is within the range of 1-100 KHz.3. The stabilized laser of claim 1 , comprising:a master laser coupled to the PDH feedback electronics and to the ...

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Номер записи: 82

12-03-2015 дата публикации

Precise Broadband Frequency Modulated Laser

Номер: US20150071315A1

Автор: Babbitt William Randall, Barber Zeb, Kaylor Brant, Reibel Randy R., Roos Peter A.

Принадлежит:

A method and apparatus are described including a laser with a plurality of internal or external actuators for affecting an optical frequency of light output by the laser, wherein the plurality of actuators have a corresponding plurality of different frequency response bands for changing optical properties of the laser and a corresponding plurality of actuation ranges of optical frequencies affected. Also included is an optical detector, and a plurality of optical paths configured to direct light output by the laser onto the detector. A laser controller is configured to provide a plurality of inputs to the plurality of actuators based on a detector signal output from the optical detector and the corresponding frequency response bands and actuation ranges. 1. An apparatus comprising:a tunable laser having a plurality of drive inputs for affecting an optical frequency of light output by the laser, wherein the plurality of drive inputs have a corresponding plurality of different frequency response bands for changing optical properties of the tunable laser and a corresponding plurality of actuation ranges of optical frequencies affected;an optical detector;a plurality of optical paths configured to direct light output by the laser onto the detector; anda laser controller configured to provide a plurality of inputs to the plurality of drive inputs based on a detector signal output from the optical detector and the corresponding frequency response bands and actuation ranges.2. An apparatus as recited in claim 1 , wherein:the apparatus further comprises external to the tunable laser an optical actuator configured to affect the optical frequency of light transmitted into the plurality of optical paths based on a signal input to the optical actuator; andthe laser controller is further configured to provide the signal input to the optical actuator based on the detector signal output from the optical detector and a frequency response band and actuation range for the optical ...

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Номер записи: 83

08-03-2018 дата публикации

Light-emitting element module, atomic oscillator, and electronic apparatus

Номер: US20180069558A1

Автор: Koji Chindo, Tsunenori Shibata, Yoshiyuki Maki

Принадлежит: Seiko Epson Corp

A light-emitting element module includes a light-emitting element that emits light, a base that has a depression portion in which the light-emitting element is accommodated, and a lid that covers an opening of the depression portion and is joined to the base. The lid includes a protrusion portion that protrudes on an opposite side to the base and has a hole through which the light passes and a window that is installed in the protrusion portion to block the hole and transmits the light. A surface of the window on a side of the light-emitting element is inclined with respect to a surface perpendicular to an optical axis of the light.

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Номер записи: 84

27-02-2020 дата публикации

LASER APPARATUS AND METHOD FOR MANUFACTURING OPTICAL ELEMENT

Номер: US20200067257A1

Автор: TEI Daisuke, Wakabayashi Osamu

Принадлежит: Gigaphoton Inc.

A laser apparatus including an optical element made of a CaFcrystal and configured to transmit an ultraviolet laser beam obliquely incident on one surface of the optical element, the electric field axis of the P-polarized component of the laser beam propagating through the optical element coinciding with one axis contained in <111> of the CaFcrystal, with the P-polarized component defined with respect to the one surface. A method for manufacturing an optical element, the method including causing a seed CaFcrystal to undergo crystal growth along one axis contained in <111> to form an ingot, setting a cutting axis to be an axis inclining by an angle within 14.18±5° with respect to the crystal growth direction toward the direction of another axis contained in <111>, which differs from the crystal growth direction, and cutting the ingot along a plane perpendicular to the cutting axis. 1. A laser apparatus comprising:{'sub': '2', 'an optical element that is made of a CaFcrystal and configured to transmit an ultraviolet laser beam obliquely incident on one surface of the optical element,'}{'sub': '2', 'an electric field axis of a P-polarized component of the laser beam propagating through an interior of the optical element coinciding with one axis contained in <111> of the CaFcrystal, with the P-polarized component defined with respect to the one surface of the optical element.'}2. The laser apparatus according to claim 1 ,wherein the optical element is a plane-parallel substrate.3. The laser apparatus according to claim 2 ,wherein the optical element forms a window of a chamber disposed in an optical path of the laser beam.4. The laser apparatus according to claim 2 ,wherein an angle of incidence of the laser beam incident on the optical element is in a range of 56.34±5°.5. The laser apparatus according to claim 4 ,wherein the optical element is so configured that an angle between a normal to the surface on which the laser beam is incident and the one axis contained in < ...

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Номер записи: 85

27-02-2020 дата публикации

LASER APPARATUS, LASER APPARATUS MANAGEMENT SYSTEM, AND LASER APPARATUS MANAGEMENT METHOD

Номер: US20200067259A1

Автор: MASUDA Hiroyuki, Wakabayashi Osamu

Принадлежит: Gigaphoton Inc.

A laser apparatus according to the present disclosure includes: a laser output unit configured to perform laser oscillation; and a control unit configured to acquire first laser performance data obtained when the laser output unit performs laser oscillation based on a first laser control parameter, and second laser performance data obtained when the laser output unit performs laser oscillation based on a second laser control parameter, while laser output from the laser output unit to an external device is stopped, and determine whether the second laser performance data has been improved as compared to the first laser performance data. 1. A laser apparatus comprising:a laser output unit configured to perform laser oscillation; anda control unit configured to acquire first laser performance data obtained when the laser output unit performs laser oscillation based on a first laser control parameter, and second laser performance data obtained when the laser output unit performs laser oscillation based on a second laser control parameter, while laser output from the laser output unit to an external device is stopped, and determine whether the second laser performance data has been improved as compared to the first laser performance data.2. The laser apparatus according to claim 1 , wherein the control unit causes claim 1 , based on a result of the determination claim 1 , the laser output unit to perform laser output to the external device by using one of the first laser control parameter and the second laser control parameter.3. The laser apparatus according to claim 2 , wherein claim 2 , when having determined that the second laser performance data has been improved claim 2 , the control unit causes the laser output unit to perform laser output to the external device by using the second laser control parameter.4. The laser apparatus according to claim 2 , wherein claim 2 , when having determined that the second laser performance data has not been improved claim 2 , the ...

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Номер записи: 86

27-02-2020 дата публикации

EXTERNAL CAVITY LASER

Номер: US20200067276A1

Автор: Baehr-Jones Thomas Wetteland, Fathololoumi Saeed, Liu Yang, Ma Yangjin, Shi Ruizhi

Принадлежит:

Practical silicon-based light sources are still missing, despite the progress in germanium lasers, because both silicon and germanium are indirect-band semiconductors and inefficient at light generation. A tunable and single mode external cavity laser comprising: a gain medium for generating light between a reflective surface at one end of the gain medium; and a wavelength selective reflector at the other end of a laser cavity. A splitter disposed in the laser cavity includes an input port optically coupled to the gain medium, an input/output port optically coupled to the wavelength selective reflector, and an output port for outputting laser light at selected wavelengths. The wavelength selective reflector reflects light of one or more selected periodic wavelengths back to the gain medium via the input/output port, and passes light of non-selected wavelengths out of the laser cavity. 120-. (canceled)21. An external cavity laser comprising:a gain medium for generating light;a first reflector at one end of the gain medium with greater than 90% reflectivity;a coupler including an input port, an input/output port, and an output port, the input port optically coupled to the gain medium, wherein the coupler is configured to split the light from the gain medium into input laser light directed to the input/output port, and output laser light directed to the output port;a wavelength selective reflector optically coupled to the input/output port forming a laser cavity with the first reflector, and configured for returning the input laser light at a selected wavelength back to the gain medium via the input/output port, and passing non-selected light at non-selected wavelengths, wherein the coupler is also configured for directing the input laser light at the selected wavelength returning from the wavelength selective reflector to the gain medium;a first phase tuner between the coupler and the wavelength selective reflector configured for tuning an optical cavity length of the ...

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Номер записи: 87

27-02-2020 дата публикации

LASER APPARATUS FOR GENERATING EXTREME ULTRAVIOLET LIGHT

Номер: US20200068695A1

Автор: NAGANO Hitoshi, WADA Yasunori, Wakabayashi Osamu, YANAGIDA Tatsuya

Принадлежит: Gigaphoton Inc.

A system for generating extreme ultraviolet light, in which a target material inside a chamber is irradiated with a laser beam to be turned into plasma, includes a first laser apparatus configured to output a first laser beam, a second laser apparatus configured to output a pedestal and a second laser beam, and a controller connected to the first and second laser apparatuses and configured to cause the first laser beam to be outputted first, the pedestal to be outputted after the first laser beam, and the second laser beam having higher energy than the pedestal to be outputted after the pedestal. 1. A system for an extreme ultraviolet (EUV) light source , the system comprising a pre-pulse laser apparatus and a main pulse laser apparatus ,the pre-pulse laser apparatus configured to output a pre-pulse laser beam so as to turn a target into a diffused target, and a light generator configured to output an optical pulse;', 'an optical element configured to transform a waveform of the optical pulse;', 'a controller configured to determine a characteristic of the transformed waveform, the transformed waveform including a first portion and a second portion, the second portion having a temporal energy profile based on a temporal profile of the optical pulse and the first portion having a temporal energy profile that is different from the temporal energy profile of the optical pulse; and', 'an amplifier including a gain medium, the amplifier configured to amplify the first portion and the second portion to form a main pulse laser beam including an amplified first portion and an amplified second portion, the amplified first portion and the amplified second portion containing sufficient energy to turn the diffused target into a plasma that emits EUV light., 'the main pulse laser apparatus including2. The system according to claim 1 , wherein the diffused target has one of a disc-shape and a torus-shape.3. The system according to claim 1 , wherein the target has a droplet shape. ...

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Номер записи: 88

11-03-2021 дата публикации

COMPACT LASER DELIVERY TO ATOMIC SYSTEMS

Номер: US20210075184A1

Автор: Bohn Matthew, Nugent Lora

Принадлежит:

Various embodiments for precise and accurate delivery, in terms of position, frequency, and/or phase, of one or more lasers to an atomic system are provided. In a first embodiment, a gate laser system for a trapped ion quantum computer comprising a first and second laser are provided. The first and second lasers are frequency locked to a first and second frequency of a frequency comb, respectively. The first and second lasers are each configured to provide laser beams to a qubit ion within an ion trap of the quantum computer to provide a gate. In another embodiment, a qubit ion and sympathetic ion management system for a trapped ion quantum computer comprising a first, second, and third laser is provided. Each laser is locked to a different frequency of a frequency comb, and provide one or more laser beams to an ion trap of the quantum computer. 1. A gate laser system for a trapped ion quantum computer , the gate laser system comprising:a first laser locked to a first frequency of a frequency comb; anda second laser locked to a second frequency of the frequency comb, 'the first and second lasers are each configured to provide a laser beam to a qubit ion within an ion trap of the trapped ion quantum computer to enact a quantum gate.', 'wherein2. The gate laser system of claim 1 , further comprising:a first radio frequency local oscillator (RF LO) coupled to the first laser; anda second RF LO coupled to the second laser.3. The gate laser system of claim 2 , further comprising:first offset lock electronics, wherein the first RF LO is coupled to the first laser via the first offset lock electronics; andsecond offset lock electronics, wherein the second RF LO is coupled to the second laser via the second offset lock electronics.4. The gate laser system of claim 3 , further comprising:a first photodiode configured to receive a portion of a first laser beam emitted by the first laser and provide feedback to the first offset lock electronics; anda second photodiode ...

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Номер записи: 89

15-03-2018 дата публикации

APPARATUS FOR INTERROGATING DISTRIBUTED OPTICAL FIBRE SENSORS USING A STIMULATED BRILLOUIN SCATTERING OPTICAL FREQUENCY-DOMAIN INTERFEROMETER

Номер: US20180073900A1

Автор: BASTIANINI Filippo

Принадлежит:

Apparatus for producing and sourcing two lightwaves having a wavelength-shift known and controllable and suitable to be used as “pump” and “probe” in a stimulated Brillouin analyser in which part of the radiation of frequency ffrom a primary source () is first shifted of a frequency Δftypically from 200 to 1000 MHz lower than the Brillouin shift Δfin the sensor, by a first frequency conversion system comprising a Brillouin ring laser () and then is shifted of a frequency Δfin order to fall inside the Brillouin gain band of the sensor through a further tuneable frequency conversion system () in which at least one electro-optical modulator generates modulation side bands () of frequency (f−Δf+Δf) and (f<Δf−Δf), only one of which can fall within a Brillouin gain band of the sensor. The apparatus possibly comprises also a feedback stabilization system that acts on Δfdepending on changes in the value of Δfin order to stabilise at least one between |Δf+Δf| and |Δf−Δf|. The apparatus solves the following problems of known solutions: wavelength-shift stability and accuracy, wavelength agility, width of the wavelength-shift tuning range, power consumption, tuning speed and industrial cost. 1. An apparatus for producing and sourcing , through multiple frequency conversions , at least two optical radiations suitable to be used in a Brillouin analyser , characterized by the facts of comprising:{'b': '70', 'at least one source () of primary radiation with frequency f0 and linewidth not greater than the Brillouin gain bandwidth GBWB,BGM in a Brillouin gain medium and possibly than that GBWB,SNS in a sensing medium; and'}{'b': 72', '102', '74', '105', '70, 'claim-text': 'fB,SNS characteristic of the sensor at least twice the width of the Brillouin gain bandwidth GBWB,SNS of the sensor; and', 'at least one first stimulated Brillouin frequency conversion system (,) using a special Brillouin Gain Medium BGM (, ) characterized by doping in Germanium and/or other substances and/or a ...

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Номер записи: 90

07-03-2019 дата публикации

FIBER LASER SYSTEM AND METHOD FOR GENERATING PULSE LASER LIGHT

Номер: US20190074656A1

Автор: Huang Pin-Han, Pan Ci-Ling, Wu Hsiao-Hua

Принадлежит: National Tsing Hua University

A fiber laser system includes a fiber laser, a laser light detecting apparatus, and a control apparatus. The fiber laser outputs a laser light, including a noise-like pulse laser light, a mode-locked pulse laser light, or a continuous-wave laser light. The laser light detecting apparatus consists of a lens and a photodiode. The photodiode absorbs the laser light outputted from the fiber laser and generates an output signal in terms of a two-photon absorption effect. The control apparatus reads the output signal of the photodiode and automatically adjusts the fiber laser, according to a preset value, to obtain the noise-like pulse laser light or the mode-locked pulse laser light. 1. A fiber laser system , comprising:a fiber laser outputting a pulse laser light, the pulse laser light comprising a noise-like pulse light laser or a mode-locked pulse laser light;a laser light detecting apparatus comprising a photodiode that absorbs the pulse laser light outputted from the fiber laser, wherein the photodiode generates a two-photon absorption signal that has two stable voltage states, which are distinguishable, in terms of the noise-like pulse laser light and the mode-locked pulse laser light respectively; anda control apparatus reading an output signal of the photodiode and automatically adjusting the fiber laser, according to a selection between the two stable voltage states, to obtain the noise-like pulse laser light or the mode-locked pulse laser light.2. The fiber laser system as recited in claim 1 , wherein the two stable voltage states are two stable absorption states of the photodiode.3. The fiber laser system as recited in claim 1 , wherein one of the two stable voltage states is selected using a threshold value.4. The fiber laser system as recited in claim 1 , wherein the control apparatus claim 1 , by a computer system claim 1 , adjusts an optical component configured to change a polarization state in the fiber laser claim 1 , thereby obtaining the pulse laser ...

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Номер записи: 91

15-03-2018 дата публикации

Pulse slicer in laser systems

Номер: US20180076593A1

Автор: John B. Lee

Принадлежит: LUMENIS LTD

An apparatus (such as a laser-based system) and method for providing optical pulses in a broad range of pulse widths and pulse energies uses a pulse slicer which is configured to slice a predefined portion having a desired pulse width of each of the one or more output optical pulses from a laser oscillator, in which timings of a rising edge and a falling edge of each sliced optical pulse relative to a time instance of a maximum of the corresponding each of the one or more output optical pulses from the laser oscillator, are chosen at least to maximize amplification efficiency of the optical amplifier, which may be located after the pulse slicer, and to provide the one or more amplified output optical pulses each having the desired pulse energy and pulse width.

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Номер записи: 92

15-03-2018 дата публикации

OPTICAL AMPLIFYING SYSTEM AND METHOD OF CONTROLLING THE SAME

Номер: US20180076595A1

Автор: Honda Masahiro

Принадлежит: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.

An optical amplifying system is disclosed. The optical amplifying system includes a thermo-electric cooler (TEC), and a semiconductor laser diode (LD) mounted on the TEC. The semiconductor LD generating a modulated signal with a designed wavelength depending on a temperature thereof that is controlled by the TEC. The optical amplifying system further includes a semiconductor optical amplifier (SOA) that amplifies the modulated optical signal. A feature of the optical amplifying system is that the temperature of the SOA is higher than that of LD. 1. An optical amplifying system , comprising:a thermo-electric cooler (TEC);a semiconductor laser diode mounted on the TEC, the semiconductor laser diode generating a modulated optical signal with a designed wavelength depending on a temperature of the semiconductor laser diode that is controlled by the TEC; anda semiconductor optical amplifier (SOA) that amplifies the modulated optical signal output from the semiconductor laser diode,wherein the SOA has a temperature thereof higher than the temperature of the semiconductor laser diode.2. The optical amplifying system of claim 1 ,further including anther TEC that mounts the SOA thereon,wherein the another TEC sets the temperature of the SOA higher than the temperature of the semiconductor laser diode.3. The optical amplifying system of claim 1 ,wherein the SOA is supplied with a driving current that raises the temperature of the SOA.4. The optical amplifying system of claim 1 ,wherein the semiconductor laser diode includes a gain region that generates laser light with the designed wavelength, and a modulating region that modulates the laser light generated by the gain region,wherein the SOA is integrated with the semiconductor laser diode and put in front of the modulating region, the SOA and the gain region sandwiching the modulating region therebetween, andwherein the gain region and the modulating region are mounted on the TEC but the SOA overhangs from the TEC.5. The ...

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Номер записи: 93

14-03-2019 дата публикации

METHOD AND SYSTEM FOR CONFIGURING BIOMEDICAL LASER

Номер: US20190076192A1

Автор: Orsila Seppo, Uusimaa Petteri, Vilokkinen Ville

Принадлежит:

A method and a system for configuring a first biomedical laser. The method includes providing a first set of operational parameters; operating the first biomedical laser using the first set of operational parameters; measuring an operational response of the first biomedical laser; measuring a light output properties of the first biomedical laser; analyzing the measured light output properties and the operational response; and triggering an action based on the analysis. 1. A method for configuring a first biomedical laser , the method comprisingproviding a first set of operational parameters;operating the first biomedical laser using the first set of operational parameters;measuring an operational response of the first biomedical laser;measuring a light output properties of the first biomedical laser;analyzing the measured light output properties and the operational response; andtriggering an action based on the analysis.2. A method according to claim 1 , wherein the first set of operational parameters comprises at least one of a target wavelength of the first biomedical laser claim 1 , a target energy output of the first biomedical laser and an operational mode selected from a group of a treatment modality claim 1 , biomedical activation and measurement process.3. A method according to claim 1 , wherein measuring the light output properties of the first biomedical laser comprises measuring at least one of a wavelength of emitted laser light claim 1 , a spectrum of emitted laser light claim 1 , an energy of the emitted laser light claim 1 , a pulse energy of the emitted laser light claim 1 , an optical power of the emitted laser light claim 1 , and a pulse form factor of the emitted laser light.4. A method according to claim 1 , wherein measuring the light output properties is carried out by arranging at least one of a first light sensor in a laser component module claim 1 , a second light sensor in proximity of a light guide claim 1 , a third light sensor at an end ...

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Номер записи: 94

14-03-2019 дата публикации

STABLE DIFFERENCE FREQUENCY GENERATION USING FIBER LASERS

Номер: US20190079368A1

Автор: FERMANN Martin E., Lee Kevin F.

Принадлежит:

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

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Номер записи: 95

22-03-2018 дата публикации

Raman pumping arrangement with improved osc sensitivity

Номер: US20180083413A1

Автор: Lutz Rapp

Принадлежит: Xieon Networks SARL

A Raman pumping arrangement for amplifying a data optical signal ( 40 ) has a Raman pump ( 12 ) for generating a Raman pump signal ( 44;45 ), an optical supervisory channel receiver ( 14 ) for receiving an optical supervisory channel signal ( 42 ) an amplification fiber ( 15 ) arranged such that the data optical signal ( 40 ), the optical supervisory channel signal ( 42 ), and the Raman pump signal ( 44;45 ) are transmitted therethrough; and a control unit ( 13 ) configured for controlling the operation of the Raman pump ( 12 ); wherein the control unit ( 13 ) is configured for setting the Raman pump ( 12 ) in an operation mode or a start-up mode; wherein in the operation mode, the Raman pump ( 12 ) provides an operation pumping power ( 120 ), and wherein in the start-up mode, the Raman pump ( 12 ) provides a start-up pumping power ( 122 ).

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Номер записи: 96

22-03-2018 дата публикации

MODE-LOCKED AND WAVELENGTH TUNABLE OPTICAL FREQUENCY COMB GENERATION THROUGH DYNAMIC CONTROL OF MICRORESONATORS

Номер: US20180083414A1

Автор: Qi Minghao, Weiner Andrew Marc, Xue Xiaoxiao

Принадлежит: PURDUE RESEARCH FOUNDATION

A tunable optical comb generator having a source laser configured to generate a continuous wave (CW) light at a first wavelength; and a microresonator coupled to the source laser and configured to receive the CW light and generate an optical signal having a plurality of output wavelengths corresponding to the first wavelength. the generator includes a microresonator tuning device coupled to the microresonator and configured to tune the microresonator to compensate the microresonator for wavelength shifts. A control circuit iscoupled to the microresonator tuning device and configured to generate a control signal to control the microresonator tuning device based on the optical signal. Multiple microresonators in the form of microrings may be included to tune the generator. A heater coupled to the microresonators may be used to adjust the microresonators. 1. A tunable optical comb generator , comprising:a source laser configured to generate a continuous wave (CW) light at a first wavelength;a microresonator coupled to the source laser, configured to receive the CW light and generate an optical signal having a plurality of output wavelengths corresponding to the first wavelength;a microresonator tuning device coupled to the microresonator and configured to tune the microresonator to compensate the microresonator for wavelength shifts; anda control circuit coupled to the microresonator tuning device and configured to generate a control signal to control the microresonator tuning device based on the optical signal.2. The tunable optical comb generator of claim 1 , the microresonator tuning device comprises a heater.3. The tunable optical comb generator of claim 1 , the microresonator tuning device comprises at least one microring.4. The tunable optical comb generator of claim 1 , further comprising:a photodetector coupled to the microresonator and configured to receive the optical signal and convert the optical signal into an electrical signal corresponding to the ...

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Номер записи: 97

14-03-2019 дата публикации

LASER UNIT AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUM

Номер: US20190081451A1

Автор: KUROSU Akihiko, MASUDA Hiroyuki, MATSUNAGA Takashi, Ohta Takeshi, TSUSHIMA Hiroaki, Wakabayashi Osamu, YASHIRO Masanori

Принадлежит: Gigaphoton Inc.

There may be provided a laser unit including a display configured to display one or both of electric power consumed by the laser unit and electric energy consumed by the laser unit. 1. A discharge-excited gas laser unit comprisinga display configured to display resource consumption of the discharge-excited gas laser unit,the resource consumption including at least one of laser gas consumption, purge gas consumption, cooling water consumption, and exhaust air consumption.2. The laser unit according to claim 1 , wherein the laser gas consumption includes at least one of:consumption of mixed gas of argon and neon; andconsumption of mixed gas of fluorine, argon, and neon.3. The laser unit according to claim 2 , further comprisinga controller configured to calculate the laser gas consumption.4. The laser unit according to claim 1 , wherein the laser gas consumption includes at least one of:consumption of mixed gas of krypton and neon; andconsumption of mixed gas of fluorine, krypton, and neon.5. The laser unit according to claim 3 , further comprisinga controller configured to calculate the laser gas consumption.6. The laser unit according to claim 1 , wherein the purge gas consumption includes at least one of consumption of nitrogen gas and consumption of helium gas.7. The laser unit according to claim 6 , further comprisinga controller configured to calculate the purge gas consumption.8. The laser unit according to claim 1 , further comprising:a charger;a pulse power module; anda chamber including a heat exchanger, whereinthe cooling water consumption includes consumption of water for cooling at least one of the charger, the pulse power module, and the heat exchanger.9. The laser unit according to claim 8 , further comprisinga controller configured to calculate the cooling water consumption.10. The laser unit according to claim 1 , wherein the exhaust air consumption includes exhaust air consumption for ventilation.11. The laser unit according to claim 10 , further ...

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Номер записи: 98

24-03-2016 дата публикации

LASER SYSTEM, EXTREME ULTRAVIOLET LIGHT GENERATION SYSTEM, AND METHOD OF CONTROLLING LASER APPARATUS

Номер: US20160087389A1

Автор: Niwano Motoki, Saito Takashi

Принадлежит: Gigaphoton Inc.

A laser system capable of appropriately controlling the energy of a laser beam pulse is provided. An exemplary laser system of the present disclosure may control an optical isolator to switch from a closed state to an open state and then to return to the closed state for each of the laser beam pulses repeatedly outputted from a master oscillator. The laser system may control the optical attenuator to set an optical transmittance of the optical attenuator for each of the laser beam pulses repeatedly outputted from the master oscillator. 1. A laser system comprising:a master oscillator configured to output laser beam pulses;multiple stages of optical amplifiers disposed on an optical path of the laser beam pulses outputted from the master oscillator and configured to sequentially amplify the laser beam pulses;an optical isolator disposed on the optical path and capable of switching between an open state and a closed state;an optical attenuator disposed on the optical path and capable of setting an optical transmittance; anda controller configured to control the optical isolator and the optical attenuator,wherein the controller controls the optical isolator to switch from the closed state to the open state and then to return to the closed state for each of the laser beam pulses repeatedly outputted from the master oscillator, andthe controller controls the optical attenuator to set an optical transmittance of the optical attenuator for each of the laser beam pulses repeatedly outputted from the master oscillator.2. An extreme ultraviolet light generation system comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the laser system according to ;'}a chamber including a plasma generation region to be irradiated with laser beam pulses from the laser system;a target supply device configured to successively supply a target to the plasma generation region in the chamber;a target detection device configured to detect passage of a target outputted from the target ...

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Номер записи: 99

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: 100