Настройки

Укажите год
-

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

Подробнее
-

Мониторинг СМИ

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

Подробнее

Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Укажите год
Укажите год
Применить Всего найдено 2930. Отображено 100.
05-04-2012 дата публикации

Large diameter optical waveguide, grating and laser

Номер: US20120082175A1
Автор: Alan D. Kersey, James M. Sullivan, Martin A. Putnam, Paul E. Sanders, Robert N. Brucato, Timothy J. Bailey
Принадлежит: Individual

A large diameter optical waveguide, grating, and laser includes a waveguide having at least one core surrounded by a cladding, the core propagating light in substantially a few transverse spatial modes; and having an outer waveguide dimension of said waveguide being greater than about 0.3 mm. At least one Bragg grating may be impressed in the waveguide. The waveguide may be axially compressed which causes the length of the waveguide to decrease without buckling. The waveguide may be used for any application where a waveguide needs to be compression tuned. Also, the waveguide exhibits lower mode coupling from the core to the cladding and allows for higher optical power to be used when writing gratings without damaging the waveguide. The waveguide may resemble a short “block” or a longer “cane” type, depending on the application and dimensions used.

Подробнее
Номер записи: 1
01-11-2012 дата публикации

Method and apparatus for generation and amplification of light in a semi-guiding high aspect ratio core fiber

Номер: US20120275475A1
Автор: Alexander A. Betin, David A. Rockwell, Vladimir V. Shkunov
Принадлежит: Raytheon Co

A planar laser gain medium and laser system. The novel laser gain medium includes an active core having a high aspect ratio cross-section with a fast-axis dimension and a slow-axis dimension, signal claddings adapted to form reflective boundaries at fast-axis boundaries of the core, and a material adapted to minimize reflections at slow-axis boundaries of the core. In an illustrative embodiment, the laser gain medium is an optical fiber. The core and claddings form a waveguide adapted to control modes propagating in the fast-axis direction. When the laser gain medium is employed as a laser oscillator, a high reflectivity mirror and an outcoupler are positioned at opposite ends of the core to form a laser resonator adapted to control modes in the slow-axis direction.

Подробнее
Номер записи: 2
08-11-2012 дата публикации

All-fiber low mode beam combiner for high power and high beam quality

Номер: US20120281948A1
Автор: Yariv Shamir, Yoav Sintov
Принадлежит: Individual

A low mode beam combiner ( 10 ) including individual entry fibers ( 12 ) that maintain a low mode operation, an exit fiber ( 16 ), and a spliced section ( 14 ) including a bundle of spliced entry fibers ( 12 ), in which a bundle diameter is reduced to a LMA (large mode area) core of the exit fiber ( 16 ).

Подробнее
Номер записи: 3
14-02-2013 дата публикации

Pulse fiber laser device

Номер: US20130038924A1
Автор: Kodai Fukazawa, Masatoshi Fujimoto
Принадлежит: Hamamatsu Photonics KK

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

Подробнее
Номер записи: 4
11-04-2013 дата публикации

SINGLE MODE PROPAGATION IN FIBERS AND RODS WITH LARGE LEAKAGE CHANNELS

Номер: US20130089113A1
Автор: Dong Liang, FERMANN Martin E., Wong William
Принадлежит: IMRA AMERICA, INC.

Various embodiments include large cores fibers that can propagate few modes or a single mode while introducing loss to higher order modes. Some of these fibers are holey fibers that comprising cladding features such as air-holes. Additional embodiments described herein include holey rods. The rods and fibers may be used in many optical systems including optical amplification systems, lasers, short pulse generators, Q-switched lasers, etc. and may be used for example for micromachining. 1. (canceled)2. An optical fiber configured to propagate at least one lower order mode having a wavelength , λ , said optical fiber comprising:a core region having a core width; anda cladding region surrounding said core region, said cladding region comprising a plurality of cladding features disposed in a matrix material, said plurality of cladding features having a maximum feature size, d, said plurality of cladding features separated by bridges having a maximum bridge width, a, said bridge comprising matrix material,wherein said core width is greater than about 25 micrometers,wherein said plurality of cladding features are arranged in no more than two layers around said core region, andwherein said maximum bridge width has a value that yields a ratio of a/λ that is at least about 5.3. The optical fiber of claim 2 , wherein said maximum bridge width claim 2 , a claim 2 , has a value that yields a ratio of a/λ that is less than about 100.4. The optical fiber of claim 2 , wherein said core width is less than about 300 micrometers.5. The optical fiber of claim 2 , wherein said maximum feature size claim 2 , d claim 2 , has a value that yields a ratio of d/λ that is in a range from about 5 to 100.6. The optical fiber of claim 2 , wherein said plurality of cladding features have an average center-to-center spacing claim 2 , Λ claim 2 , and wherein d/Λ is greater than about 0.4 and less than about 0.9.7. The optical fiber of claim 2 , wherein said plurality of cladding features are ...

Подробнее
Номер записи: 5
25-04-2013 дата публикации

PUMP ABSORPTION AND EFFICIENCY FOR FIBER LASERS/AMPLIFIERS

Номер: US20130100972A1
Автор: Creeden Daniel J.
Принадлежит: BAE Systems Information and Electric Systems Integration Inc.

Techniques are disclosed for improving pump absorption and efficiency for fiber lasers and amplifiers, for instance. In some embodiments, the techniques are implemented by applying a partially reflective coating on a fiber end-face to double-pass any unabsorbed or otherwise excess pump light in the cladding of a fiber. While being reflective to pump wavelengths, the coating can be non-reflective at the lasing wavelength, so as to avoid unwanted feedback into the system. The benefits of this approach include that excess pump power can be effectively utilized to add more power to the laser output. In addition, the double-pass technique allows for the use of a shorter fiber length, which in turn allows for more compact system designs, saves on material costs, and facilitates manufacturability. 1. An optical fiber comprising:a fiber core;a first cladding surrounding the core;an outer cladding surrounding the first cladding, wherein the outer cladding has a lower index of refraction than the first cladding; anda partial reflector applied to a fiber-to-free-space interface associated with the fiber, wherein the partial reflector is reflective at pump light wavelengths and antireflective at core light wavelengths.2. The optical fiber of claim 1 , wherein the partial reflector is configured to double-pass any unabsorbed pump light back through the first cladding.3. The optical fiber of or claim 1 , wherein the length of the optical fiber is determined based on optimal double-pass absorption of pump light.4. The optical fiber of any of the preceding claims claim 1 , wherein the partial reflector is applied to a tip of the optical fiber.5. The optical fiber of any of the preceding claims claim 1 , wherein a tip of the optical fiber is coated by the partial reflector.6. The optical fiber of any of the preceding claims claim 1 , wherein the partial reflector is applied to a tip of the optical fiber using a fiber connector claim 1 , and connectorization adhesive does not strip ...

Подробнее
Номер записи: 6
18-07-2013 дата публикации

LASER PROCESSING APPARATUS

Номер: US20130182727A1
Автор: Matsumoto Akihisa, Tahara Akihiro, Yamazaki Naoya
Принадлежит:

A laser marking apparatus is provided with a laser emission unit that emits laser beam and a laser radiation unit that is detachably connected to the laser emission unit. The laser radiation unit radiates the laser beam emitted from the laser emission unit toward an object to be processed. A projection, which projects rearward, is formed on a part of the laser radiation unit that is connected with the laser emission unit. A recess is provided in a part of the laser emission unit that is connected with the laser radiation unit. The projection can fit into the recess. The recess is opened forward, backward, to lateral sides, and downward. 110-. (canceled)11. A laser processing apparatus comprising:a laser oscillation portion;a laser emission unit including an emission optical system that emits a laser beam oscillated by the laser oscillation portion;a laser radiation unit that is detachably connected to the laser emission unit and has a radiation optical system for radiating the laser beam emitted from the laser emission unit to an object to be processed;a first connection portion provided in a part of the laser emission unit that is connected to the laser radiation unit;a second connection portion provided in a part of the laser radiation unit that is connected to the laser emission unit;a projection provided on a lower end portion of one of the first connection portion and the second connection portion, the projection protruding along an optical axis of the laser beam; anda recess provided on a lower end portion of the other one of the first connection portion and the second connection portion, whereinthe recess can fit the projection and slideably guide the projection along the optical axis, andthe recess is open in a direction facing at least the projection in an optical axis direction and downward in a direction intersecting the optical axis.12. The laser processing apparatus according to claim 11 , further comprising a main unit that has the laser oscillation ...

Подробнее
Номер записи: 7
01-08-2013 дата публикации

High Power Single Mode Ytterbium Fiber Laser System with Single Mode Neodymium Fiber Pump Source

Номер: US20130195126A1
Автор: Igor Samartsev, Valentin Gapontsev
Принадлежит: IPG Photonics Corp

A high power fiber laser system emitting a substantially diffraction limited beam with a Gaussian intensity profile includes a single mode (“SM”) neodymium fiber pump source outputting a SM pump light; a seed laser operative to emit a SM signal light at a wavelength greater than that of the pump light; a SM DWM receiving and multiplexing the SM pump and signal lights. The disclosed system further includes a booster fiber amplifier which is configured with a frustoconically-shaped ytterbium (“Yb”) doped core receiving the pump and signal lights and configured with a small diameter input end which supports only a SM and a large diameter output end which is capable of supporting the SM and high order modes (:HOM”). The booster further has a cladding surrounding and coextending with the core, the core being configured for having intensity profiles of respective SMs of pump and signal lights overlap one another so that an overlap integral substantially equals to one (1) along an entire length of the core. The SM of the light signal extracts substantially the entire energy from the pump mode leaving the HOMs without amplification necessary to affect a quality of the diffraction limited beam of the system in a MW peak power range and hundreds of watt average power range.

Подробнее
Номер записи: 8
21-11-2013 дата публикации

Fiber laser

Номер: US20130308661A1
Автор: Hideaki Itoh, Hitoshi Nishimura
Принадлежит: Panasonic Corp

The optical fiber of the present invention has an input double-clad fiber containing high-reflection FBG, an oscillation double-clad fiber, and an output double-clad fiber containing low-reflection FBG. The output double-clad fiber is formed of a core, a first clad, and a second clad. In the output double-clad fiber, a high refractive-index resin coat section recoated with high refractive-index resin whose refractive index is the same as that of the second clad or greater is disposed at a part where the second clad is partly removed between an output end and the low-reflection FBG. The refractive index of the high refractive-index resin coat section gradually increases along the direction in which light travels through the first clad.

Подробнее
Номер записи: 9
01-01-2015 дата публикации

Amplifying apparatus and amplifying medium

Номер: US20150002923A1
Автор: Miki Onaka
Принадлежит: Fujitsu Ltd

An amplifying apparatus includes an optical fiber that includes a wound portion doped with a rare earth element and three-dimensionally wound, holes being formed in cladding of the optical fiber and surrounding a core of the optical fiber, the optical fiber transmitting signal light injected thereinto; a thermally conductive member in which the wound portion of the optical fiber embedded, the thermally conductive member having thermal conductivity; a light source that emits excitation light; an injecting unit that injects the excitation light emitted by the light source, into the optical fiber; and a temperature adjusting unit that includes a thermal coupling unit thermally connected to the light source and the thermally conductive member, the temperature adjusting unit adjusting a temperature of the thermal coupling unit.

Подробнее
Номер записи: 10
02-01-2020 дата публикации

Fiber management cartridge

Номер: US20200003980A1
Автор: Christopher Andrew Luetjen, Nicolas Trent Meacham, Rodney Mark STEPHENS, Shaun Cody Hampton
Принадлежит: NLight Inc

Some embodiments may include a fiber management cartridge, comprising: a plurality of sheets of material arranged in a stack, each sheet including: a first section to fasten to a surface; and a second section to make movement relative to the surface when the first section is fastened to the surface, the second section to hold one or more loops of one or more optical fibers, respectively, of a fiber laser. Other embodiments may be disclosed and/or claimed.

Подробнее
Номер записи: 11
07-01-2021 дата публикации

Single-Frequency Fiber Amplifier with Distal Cladding Stripper

Номер: US20210006029A1
Автор: Franklin Jose, Kelsey Yee, Steven J. Augst
Принадлежит: Massachusetts Institute of Technology

Stimulated Brillouin scattering (SBS) limits the maximum power in fiber lasers with narrow linewidths. SBS occurs when the power exceeds a threshold proportional to the beam area divided by the effective fiber length. The fiber lasers disclosed here operate with higher SBS power thresholds (and hence higher maximum powers at kilohertz-class linewidths) than other fiber lasers thanks to several techniques. These techniques include using high-absorption gain fibers, operating the laser with low pump absorption (e.g., ≤80%), reducing the length of un-pumped gain fiber at the fiber output, foregoing a delivery fiber at the output, foregoing a cladding light stripper at the output, using free-space dichroic mirrors to separate signal light from unabsorbed pump light, and using cascaded gain fibers with non-overlapping Stokes shifts. The upstream gain fiber has high absorption and a larger diameter for high gain, and subsequent gain fiber has a smaller diameter to improve beam quality.

Подробнее
Номер записи: 12
12-01-2017 дата публикации

DEVICE COMPRISING AN OPTICAL FIBER HAVING A HIGH BRILLOUIN THRESHOLD AND METHOD FOR MANUFACTURING SUCH A DEVICE

Номер: US20170012401A1
Автор: Canat Guillaume, Fleury Didier, Lombard Laurent, Renard William
Принадлежит: Office National d'Etudes et de Recherches Aérospatiales-ONERA

According to one aspect, the invention relates to a device comprising an optical fibre having a high Brillouin threshold, said device including an optical fibre () suitable for propagating a high-power optical signal beam, means () for coupling a signal beam to an entrance end of the optical fibre () and a tubular structure () comprising at least one first tube () and at least one first adhesive material (). According to the present description, at least one portion of the optical fibre is immobilized in the tubular structure () by means of the first adhesive material (), which adheres both to the internal surface of the first tube () and to the external surface of the optical fibre (). Furthermore, at room temperature and with no other external stresses on the device, the immobilized portion of the optical fibre () is maintained in a compressive state by the tubular structure, the compressive state being such that the relative deformation of the optical fibre is negative or zero in its portion immobilized in the tubular structure, the maximum value of the relative deformation of the immobilized portion of the optical fibre being higher in absolute value than 0.3%. 1. A fiber-optic device having a high Brillouin threshold comprising:an optical fiber suitable for the propagation of a signal beam of high optical power and having an external surface;means for coupling a signal beam into an entry end of the optical fiber; anda tubular structure comprising at least one first tube with an internal surface and at least one first adhesive material, such that:at least one portion of the optical fiber is immobilized in the tubular structure by the first adhesive material, adhering to the internal surface of the first tube and to the external surface of the optical fiber, andat room temperature and with no other external stresses on the device, the immobilized portion of the optical fiber is maintained in a compressive state by the tubular structure, such that the strain of ...

Подробнее
Номер записи: 13
14-01-2016 дата публикации

High Power Chirally Coupled Core Optical Amplification Systems and Methods

Номер: US20160013607A1
Автор: Roger L. Farrow, Timothy S. McComb
Принадлежит: NLight Inc

An optical amplification system is disclosed which includes a seed source providing a seed beam, and a chirally coupled core fiber amplifier optically coupled to the seed beam and configured to convert the coupled seed beam into an amplifier output beam, wherein the polarization of the seed beam is controllably launched into the chirally coupled core fiber in order to reduce nonlinearities in the amplifier output beam. Peak output powers in excess of 500 kW can be realized for short-pulsed single-mode beams having mode field diameters greater than 30 μm.

Подробнее
Номер записи: 14
03-02-2022 дата публикации

Optical fiber for a fiber laser, fiber laser, and production method for optical fiber for a fiber laser

Номер: US20220037847A1
Автор: Hiroshi Takigawa, Tetsuhisa Takazane
Принадлежит: FANUC Corp

An optical fiber for a fiber laser includes a core to which a rare-earth element is added, a first cladding formed around the core; and a second cladding formed around the first cladding, and excitation light is guided from at least one end of the first cladding to excite the rare-earth element to output a laser oscillation light. An addition concentration of the rare-earth element to the core is different in a longitudinal direction of the optical fiber for a fiber laser, and a core diameter and a numerical aperture of the optical fiber for a fiber laser are constant in the longitudinal direction of the optical fiber for a fiber laser.

Подробнее
Номер записи: 15
16-01-2020 дата публикации

RARE EARTH-DOPED DOUBLE-CLAD OPTICAL FIBER AND PREPARATION METHOD THEREOF

Номер: US20200018897A1
Автор: CAO Beibei, HUANG Hongqi, WANG Peng, YANG Yucheng, YUE Tianyong, ZHANG Xinben
Принадлежит:

A rare earth-doped double-clad optical fiber includes a rare earth ion-doped fiber core, an inner cladding layer, and an outer cladding layer. A cross section of the inner cladding layer is a non-circular plane including at least two arcuate notches. According to the provided optical fiber, optical processing can be performed on a preform without changing a preform preparation process and a drawing process. The inner cladding is designed to have a non-circular planar structure having a cross section with at least two arcuate notches. While maintaining the same light absorption efficiency of pump light within the cladding layer, a preform polishing process is simplified, a risk of cracking the preform during polishing of multiple surfaces and a risk of contamination of the preform caused by impurities are reduced, wire drawing control precision is better, and comprehensive performance of the optical fiber is improved. 1. A rare earth-doped double-clad optical fiber , comprising a rare earth ion-doped fiber core , an inner cladding layer , and an outer cladding layer , wherein a cross section of the inner cladding layer is a non-circular plane comprising at least two arcuate notches.2. The rare earth-doped double-clad optical fiber according to claim 1 , wherein a relationship between a refractive index nof the fiber core and a refractive index nof the inner cladding layer is represented as (n−n) claim 1 , which is in a range from 0.01 to 0.25.3. The rare earth-doped double-clad optical fiber according to claim 1 , wherein a relationship between the refractive index nof the inner cladding layer and a refractive index nof the outer cladding layer is represented as (n−n) claim 1 , which is in a range from 0.2 to 0.5.4. The rare earth-doped double-clad optical fiber according to claim 1 , wherein rare earth ions doped in the fiber core comprise one or two of Tm claim 1 , Yb claim 1 , Ho claim 1 , and Er.5. The rare earth-doped double-clad optical fiber according to claim ...

Подробнее
Номер записи: 16
17-01-2019 дата публикации

SINGLE OPTICAL FIBER-BASED MULTI-RING LASER BEAM DEVICE, AND MANUFACTURING METHOD THEREFOR

Номер: US20190020170A1
Автор: Lee Kyung Yong
Принадлежит:

The present invention relates to a single optical fiber-based multi-ring laser beam device, and a manufacturing method therefor. The present invention enables a laser beam to be emitted in a single optical fiber through at least two stair-type processing methods by allowing the laser beam to be radially spread out in a lengthwise direction of the optical fiber in two or more ring forms. Therefore, if two ring-form light profiles are used instead of one ring-form light profile, an energy burden on a glass tube is reduced because of an energy dispersion effect such that a safe treatment effect can be provided without the risk of damage to the glass tube. In addition, according to one embodiment of the present invention, an unnecessary process is removed by forming two rings in one optical fiber instead of using two optical fibers, such that advantages of simple manufacturing and cost reduction are provided. Furthermore, according to another embodiment of the present invention, two or more ring-form light profiles are provided in one optical fiber such that an effect of enabling a glass tube size to be reduced is provided. 1. A single optical fiber-based multi-ring laser beam device is characterized in that a laser beam is emitted in a single optical fiber in a lengthwise direction of an optical fiber through a two-or-more-stair-type process in two or more ring forms so as to be radially spread out.2. The single optical fiber-based multi-ring laser beam device according to claim 1 , comprising:{'b': '110', 'an optical-fiber outer cover () which is configured to cover an optical fiber;'}{'b': 120', '110', '110, 'an multi-ring optical fiber () which is a part of the optical fiber covered by the optical-fiber outer cover () and is formed through a two-or-more-stair-type process at a section that is not covered by the optical-fiber outer cover (); and'}{'b': 130', '1', '131', '2', '132', '110', '131, 'a glass tube () which has an inner diameter (D) of a mouth () thereof ...

Подробнее
Номер записи: 17
21-01-2021 дата публикации

FIBER LASER SYSTEM AND CONTROL METHOD THEREFOR

Номер: US20210021092A1
Автор: Matsuoka Yuji
Принадлежит: FUJIKURA LTD.

A fiber laser system, includes: N fiber laser units that generates respective laser beams, where N≥2; an output combiner that: combines the respective laser beams, and generates output light including, as the respective laser beams, laser beams different from each other in terms of NA power cumulative distribution; and a control unit that sets a power of each of the respective laser beams such that an upper limit NA corresponding to each of not more than (N−1) predetermined power cumulative rate(s) is equal to a specified value for the output light. 1. A fiber laser system , comprising:N fiber laser units, that generate respective laser beams, where N≥2; combines the respective laser beams, and', 'generates output light comprising, as the respective laser beams, laser beams different from each other in terms of NA power cumulative distribution; and, 'an output combiner thata control unit that sets a power of each of the respective laser beams such that an upper limit NA corresponding to each of not more than (N−1) predetermined power cumulative rate(s) is equal to a specified value for the output light.2. The fiber laser system according to claim 1 , wherein the control unit sets the power of each of the respective laser beams such that the upper limit NA corresponding to each of (N−1) predetermined power cumulative rate(s) is equal to the specified value for the output light.3. The fiber laser system according to claim 1 , wherein the control unit sets the power of each of the respective laser beams such that:the upper limit NA corresponding to each of (N−2) predetermined power cumulative rate(s) is equal to the specified value for the output light, andthe output light has a beam profile similar to a specified beam profile.4. A method for controlling a fiber laser system that comprises: N fiber laser units claim 1 , where N≥2 claim 1 , generates respective laser beams; and an output combiner that combines the respective laser beams and that generates output light ...

Подробнее
Номер записи: 18
24-01-2019 дата публикации

Multi-clad Optical Fiber

Номер: US20190025502A1
Автор: Feve Jean-Philippe, Stegeman Robert A., Tucker James P., Zediker Mark S.
Принадлежит: Nuburu, Inc.

A multi-clad optical fiber design is described in order to provide low optical loss, a high numerical aperture (NA), and high optical gain for the fundamental propagating mode, the linearly polarized (LP) 01 mode in the UV and visible portion of the optical spectrum. The optical fiber design may contain dopants in order to simultaneously increase the optical gain in the core region while avoiding additional losses during the fiber fabrication process. The optical fiber design may incorporate rare-earth dopants for efficient lasing. Additionally, the modal characteristics of the propagating modes in the optical core promote highly efficient nonlinear mixing, providing for a high beam quality (M<1.5) output of the emitted light. 1. A fused silica based , multi-clad optical fiber comprising:a core surrounded by a first cladding layer, whereby the optical fiber has a high NA;{'sup': 2', '2, 'whereby the fiber is configured to convert low beam quality visible or UV light, having an M>>1.5, to high beam quality light, having an M<1.5;'}a hydrogen dopant, whereby the fiber is configured to provide low propagation losses in the visible or UV portions of the optical spectrum; and,the core comprising a GRIN structure.2. The fiber of claim 1 , wherein the GRIN structure comprises components selected from the group consisting of modifiers to the silica glass to alter the refractive index claim 1 , structures comprised of the silica glass to alter the effective refractive index claim 1 , and modifiers to the silica glass to shield the core from UV radiation.3. The fibers of or claim 1 , wherein the first cladding is surround by a second and the second cladding is surround by an outer cladding claim 1 , wherein each of the claddings comprises fused silica glass.4. The fibers of or claim 1 , wherein the first cladding is surround by a second and the second cladding is surround by an outer cladding claim 1 , wherein each of the claddings comprises fused silica glass with chemical ...

Подробнее
Номер записи: 19
23-01-2020 дата публикации

Multi-photon wavefront sensor, methods, and applications

Номер: US20200025627A1
Автор: Chris Xu, David Sinefeld, Fei Xia
Принадлежит: CORNELL UNIVERSITY

A multi-photon wavefront sensor system and method. The system includes a Shack-Hartmann wavefront sensor and a laser excitation source configured to emit a plurality of laser pulses at a wavelength in the near-infrared range, wherein the plurality of laser pulses are configured to induce multi-photon absorption in a detector material of the Shack-Hartmann wavefront sensor.

Подробнее
Номер записи: 20
02-02-2017 дата публикации

Holography using a double-end-emitting fiber laser

Номер: US20170031319A1
Автор: Nicholas Sheppard BROMER
Принадлежит: EMPIRE TECHNOLOGY DEVELOPMENT LLC

In some examples, a system may be configured to generate a holographic image of an object. The system may include a holographic recording medium and a fiber laser. The fiber laser may be configured to generate a first output beam at a first end of an optical fiber of the fiber laser. The fiber laser may be further configured to generate a second output beam at a second end of the optical fiber. The first output beam may be configured to be directed toward the object as an illumination beam for the holographic image of the object. Additionally, the second output beam may be configured to be directed toward the holographic recording medium as a reference beam for the holographic image.

Подробнее
Номер записи: 21
04-02-2016 дата публикации

Modelocked Laser

Номер: US20160036196A1
Автор: Almeida Paulo, Clowes John Redvers, Grudinin Anatoly Borisovich
Принадлежит:

A modelocked laser for generating pulses comprises a laser cavity, wherein the laser cavity comprises a length of hollow core fiber and wherein the length of hollow core fiber is such that the laser cavity supports a repetition rate of the generated pulses below 5 MHz. 1. A modelocked laser for generating pulses , comprising a laser cavity , wherein:the laser cavity comprises a length of hollow core fiber; andwherein the length of hollow core fiber is such that the laser cavity supports a repetition rate of the generated pulses below 5 MHz.2. A modelocked laser according to claim 1 , wherein the hollow core fiber comprises a microstructured optical fiber.3. A modelocked laser according to claim 2 , wherein the hollow core fiber comprises a photonic bandgap microstructured optical fiber.4. A modelocked laser according to claim 1 , wherein the laser cavity comprises a passive modelocking element.5. A modelocked laser according to claim 4 , wherein the passive modelocking element comprises a semiconductor saturable absorber mirror.6. A modelocked laser according to claim 1 , wherein the length of hollow core fiber has a length equal to or greater than 50% of the total cavity length.7. A modelocked laser according to claim 1 , wherein the length of hollow core fiber has a length equal to or greater than 70% of the total cavity length.8. A modelocked laser according to claim 1 , wherein the length of hollow core fiber has a length equal to or greater than 90% of the total cavity length.9. A modelocked laser according to claim 1 , wherein the total cavity length is greater than 20 m.10. A modelocked laser according to claim 1 , wherein the total cavity length is greater than 100 m.11. A modelocked laser according to claim 1 , wherein the laser cavity further comprises a fiber based gain medium.12. A modelocked laser according to claim 1 , wherein the laser cavity is an all-fiber laser cavity.13. A modelocked laser according to claim 1 , wherein the time duration of the ...

Подробнее
Номер записи: 22
05-02-2015 дата публикации

Single mode propagation in fibers and rods with large leakage channels

Номер: US20150036703A1
Автор: Liang Dong, Martin E. Fermann, William Wong
Принадлежит: IMRA America Inc

Various embodiments include large cores fibers that can propagate few modes or a single mode while introducing loss to higher order modes. Some of these fibers are holey fibers that comprise cladding features such as air-holes. Additional embodiments described herein include holey rods. The rods and fibers may be used in many optical systems including optical amplification systems, lasers, short pulse generators, Q-switched lasers, etc. and may be used for example for micromachining.

Подробнее
Номер записи: 23
01-02-2018 дата публикации

Optical Waveguide as Amplifier Fibre for High-Performance Operation

Номер: US20180034234A1
Автор: Jauregui Misas César, Limpert Jens, OTTO Hans Jürgen, Tunnermann Andreas
Принадлежит:

The invention relates to an optical waveguide () as a laser medium or as a gain medium for high-power operation, wherein the optical waveguide () is an optical fiber, the light-guiding core of which, at least in sections, is doped with rare earth ions. It is an object of the invention to provide an optical waveguide as a laser or a gain medium, and a laser/amplifier combination realized therewith, in which the output signal of the laser or gain medium is better stabilized. The invention achieves this object by virtue of the maximum small signal gain of the optical waveguide () being up to 60 dB, preferably up to 50 dB, more preferably up to 40 dB, even more preferably up to 30 dB, on account of the concentration of the rare earth ions and/or the distribution thereof in the light-guiding core. Moreover, the invention relates to the use of such an optical waveguide as an amplifier fiber () in a laser/amplifier combination. 1. Optical waveguide as a laser medium or a gain medium for high-power operation , wherein the optical waveguide is an optical fiber , the light-guiding core of which , at least in sections , is doped with rare earth ions ,wherein the maximum small signal gain of the optical waveguide is up to 60 dB, preferably up to 50 dB, more preferably up to 40 dB, even more preferably up to 30 dB, on account of at least one of the concentration of the rare earth ions and the distribution thereof in the light-guiding core.2. Laser/amplifier combination comprising a laser , an amplifier fiber and a pump light source , wherein the pump light source optically pumps the amplifier fiber and wherein the amplifier fiber amplifies the radiation of the laser propagating therein , wherein the core of the amplifier fiber guiding the laser radiation , at least in sections , is doped with rare earth ions ,wherein the maximum small signal gain of the amplifier fiber is up to 60 dB, preferably up to 50 dB, more preferably up to 40 dB, even more preferably up to 30 dB, on ...

Подробнее
Номер записи: 24
17-02-2022 дата публикации

Bismuth doped fiber amplifier

Номер: US20220052502A1
Автор: Jiawei Luo, Vitaly Mikhailov
Принадлежит: OFS FITEL LLC

Bismuth (Bi) doped optical fibers (BiDF) and Bi-doped fiber amplifiers (BiDFA) are shown and described. The BiDF comprises a gain band and an auxiliary band. The gain band has a first center wavelength (λ1) and a first six decibel (6 dB) gain bandwidth. The auxiliary band has a second center wavelength (λ2), with λ2>λ1. The system further comprises a signal source and a pump source that are optically coupled to the BiDF. The signal source provides an optical signal at λ1, while the pump source provides pump light at a pump wavelength (λ3).

Подробнее
Номер записи: 25
17-02-2022 дата публикации

PACKAGE SELF-HEATING USING MULTI-CHANNEL LASER

Номер: US20220052508A1
Автор: Bovington Jock T., Schlepple Norbert
Принадлежит:

Aspects described herein include a method of fabricating an optical component. The method comprises electrically coupling different laser channels of a laser die to different electrical leads, testing a respective optical coupling of each of the different laser channels, optically aligning an optical fiber with a first laser channel of the different laser channels having the greatest optical coupling, and designating a second laser channel of the different laser channels as a heater element for the first laser channel. 1. A method of fabricating an optical component , the method comprising:electrically coupling different laser channels of a laser die to different electrical leads;testing a respective optical coupling of each of the different laser channels;optically aligning an optical fiber with a first laser channel of the different laser channels having a greatest optical coupling; anddesignating a second laser channel of the different laser channels as a heater element for the first laser channel.2. The method of claim 1 , wherein electrically coupling the different laser channels comprises:attaching the laser die to a header of a package for the optical component, wherein the header comprises the different electrical leads.3. The method of claim 2 , further comprising:contacting a cap of the package to the header,wherein a lens is arranged at an opening of the cap, andwherein testing the respective optical coupling and optically aligning the optical fiber are performed through the lens.4. The method of claim 3 , wherein optically aligning the optical fiber comprises moving the cap relative to the header claim 3 , the method further comprising:rigidly attaching the cap to the header.5. The method of claim 3 , wherein optically aligning the optical fiber comprises:arranging the optical fiber at a first distance from the lens, wherein the first distance is based on a magnification of the lens and is selected to match a mode size of the different laser channels to ...

Подробнее
Номер записи: 26
11-02-2016 дата публикации

Device for Generating Laser Radiation Having a Linear Intensity Distribution

Номер: US20160041397A1
Автор: Harten Paul Alexander, Lissotschenko Vitalij
Принадлежит:

The invention relates to a device for generating laser radiation () having a linear intensity distribution (), comprising a plurality of laser light sources for generating laser radiation () and optical means for transforming laser radiation () exiting from the laser light sources into laser radiation () that has a linear intensity distribution () in a working plane (), wherein the laser light sources are constructed as fundamental mode lasers and the device is designed such that each of the laser beams () exiting from the laser light sources does not overlap with itself. 23. The device according to claim 1 , wherein the laser light sources generate laser beams () having a beam quality factor Mof less than 2.0.3. (canceled)4119. The device according to claim 1 , wherein the device is designed in such a way that the linear intensity distribution () has in the working plane () a ratio of length to width of greater than 10.510103a. The device according to claim 1 , wherein only the lateral flanks () of the intensity distributions () of the individual laser beams () overlap in the longitudinal direction (X) of the line.648. The device according to claim 1 , wherein the optical devices comprises collimating and/or imaging lenses ( claim 1 , ).66. The device according to claim 1 , wherein the optical device comprises at least one transformation component () transforming a Gaussian distribution into a top-hat distribution.8663636. The device according to claim 6 , wherein the device comprises a plurality of transformation components () claim 6 , with each one of the transformation components () being assigned to a respective one of the laser light sources in such a way that the laser beams () exiting from a first laser light source pass through a first transformation component () and the laser beams () exiting from a second laser light source pass through a second transformation component ().92. The device according to claim 1 , wherein the several common ferrules () are ...

Подробнее
Номер записи: 27
07-02-2019 дата публикации

Laser Alignment Apparatus and System for Alignment of Output Fiber of a Fiber Laser

Номер: US20190039172A1
Автор: Grapov Yuri
Принадлежит: IPG Photonics Corporation

A laser alignment system is used to align an output fiber with a fiber laser, for example, when coupling a feeding fiber to a process fiber using a beam coupler or switch. The alignment system includes a laser alignment apparatus that is coupled at a first end to the output fiber and at a second end to a beam dump/power meter. The alignment apparatus defines a light passage and a light capture chamber along the light passage. When light is not aligned into the core of the output fiber, at least a portion of the light passing out of the output fiber will be captured by the light capture chamber and detected by a photodetector in optical communication with the light capture chamber. By monitoring the readings of the photodetector, the output fiber may be properly aligned with the laser light from the fiber laser. 1. A laser alignment apparatus comprising:at least one housing defining a light passage extending from a first end to a second end and a light capture chamber located along the light passage, the light capture chamber having a reflective arcuate inner surface and an inner wall defining a central aperture coaxial with the light passage, wherein the inner wall extends toward the first end and separates the aperture from a portion of the light capture chamber, and wherein the reflective arcuate inner surface of the light capture chamber is configured to reflect light passing from the first end toward the second end when the light is outside the central aperture;at least one photodetector in optical communications with the light capture chamber; anda fiber coupler adapter coupled to the first end of the housing for receiving a fiber coupler at one end of an output fiber optically coupled to a fiber laser.2. The laser alignment apparatus of wherein the fiber coupler adapter is removably mounted to the housing with fasteners.3. The laser alignment apparatus of wherein at least one housing includes an outer housing and an inner housing.4. The laser alignment ...

Подробнее
Номер записи: 28
18-02-2021 дата публикации

THERAPEUTIC SYSTEMS, DEVICES, AND COMPOSITIONS WITH WOUND HEALING AND TISSUE REGENERATIVE PROPERTIES, USES THEREOF, AND CORRESPONDING METHODS

Номер: US20210046163A1
Автор: Kalmeta Margaret V.
Принадлежит:

Presented herein are compositions that can be administered to a subject having damaged tissue, for example a wound. The compositions are often administered in combination with administration of energy (e.g., laser energy, light from a light emitting diode, radiofrequency (RF) energy, audio frequency energy, etc.) from an energy generating device and/or system to the affected site. The compositions, systems, devices, and methods herein were found to induce wound healing and tissue regeneration. 1. A composition with wound healing and tissue regenerative properties , the composition comprising two or more of , or three or more of:a. collagenb. hyaluronic acidc. fucose,d. copper, ande. iron.2. The composition of claim 1 , wherein the collagen comprises collagen fibers.3. The composition of claim 1 , wherein the collagen comprises partially or completely hydrolyzed collagen.4. The composition of any one of claim 1 , wherein the collagen is acid treated collagen.5. The composition of any one of claim 1 , wherein the copper comprises a copper salt.6. The composition of claim 5 , wherein the copper salt comprises CuClor CuCl.7. The composition of any one of claim 1 , wherein the iron comprises an iron salt.8. The composition of claim 7 , wherein the iron salt comprises FeCl.9. The composition of any one of claim 1 , wherein the composition has a pH in a range of 1 to 4 claim 1 , or 2 to 3.10. The composition of any one of claim 1 , wherein the composition comprises a water content in a range of 0% to 20% claim 1 , or 0% to 10% claim 1 , or 0% to 5% (wt/wt).11. A system configured to be used to treat and/or generate tissue claim 1 , the system comprising:a device configured to generate one or more types of therapeutic energy for provision to the tissue, the one or more types of therapeutic energy comprising one or more of laser radiation, radio frequency (RF) waves, audio frequency waves, or light from a light emitting diode (LED); anda composition with wound healing and/or ...

Подробнее
Номер записи: 29
18-02-2021 дата публикации

Multi-clad Optical Fiber

Номер: US20210048578A1
Автор: Feve Jean-Philippe, Stegeman Robert A., Tucker James P., Zediker Mark S.
Принадлежит: Nuburu, Inc.

A multi-clad optical fiber design is described in order to provide low optical loss, a high numerical aperture (NA), and high optical gain for the fundamental propagating mode, the linearly polarized (LP) 01 mode in the UV and visible portion of the optical spectrum. The optical fiber design may contain dopants in order to simultaneously increase the optical gain in the core region while avoiding additional losses during the fiber fabrication process. The optical fiber design may incorporate rare-earth dopants for efficient lasing. Additionally, the modal characteristics of the propagating modes in the optical core promote highly efficient nonlinear mixing, providing for a high beam quality (M<1.5) output of the emitted light. 118-. (canceled)19. A method of converting low beam quality light to high beam quality of light , the method comprising:{'sup': '2', 'claim-text': (i) a silica glass;', '(ii) a core surrounded by a first cladding layer, whereby the fused silica based, multi-clad optical fiber has a high NA;', '(iii) the core comprising a GRIN structure; and,', '(iv) a hydrogen dopant;', '(v) whereby the fused silica based, multi-clad optical fiber is configured to provide low propagation losses in the visible or UV portions of the optical spectrum, '(a) directing a laser beam having a wavelength in the UV and visible wavelength ranges and an M>1.5 into a fused silica based, multi-clad optical fiber comprising{'sup': '2', '(b) converting the laser beam in the multi-clad optical fiber to high beam quality light having an M<1.5.'}201. The method of claim , wherein the GRIN structure comprises components selected from the group consisting of modifiers to the silica glass to alter the refractive index , structures comprised of the silica glass to alter the effective refractive index , and modifiers to the silica glass to shield the core from UV radiation.2112. The method of claim or , wherein the first cladding is surround by a second and the second cladding is ...

Подробнее
Номер записи: 30
26-02-2015 дата публикации

FIBRE LASER

Номер: US20150055666A1
Автор: FARRELL CARL, REID DERRYCK TELFORD
Принадлежит:

A fibre laser having an optical cavity that has an optical fibre and a curved mirror for imaging light leaving the fibre back into the fibre. The optical fibre has a round trip dispersion loss of less than 200000 fs. The round trip length of the optical fibre is less than 2.3 m. 131-. (canceled)32. A fibre laser comprising an optical cavity , wherein the optical cavity comprises:an optical fibre comprising a gain medium; andan imaging device configured to image light leaving the optical fibre back into the optical fibre.33. The fibre laser of claim 32 , wherein the optical fibre is characterized by a round trip dispersion loss of less than 200000 fs.34. The fibre laser of claim 32 , wherein the optical fibre is characterized by a round trip length of the optical fibre is less than 2.3 m.35. The fibre laser of claim 32 , comprising at least one optical element configured to increase the length of the optical cavity.36. The fibre laser of claim 32 , wherein the optical cavity comprises a modelocking mechanism.37. The fibre laser of claim 32 , wherein the fibre laser comprises a pulse time-compression device optically coupled to an output of the optical cavity.38. The fibre laser of claim 37 , wherein claim 37 ,the pulse time-compression device comprises a Gires Tournois interferometer; and [{'sup': '2', 'a round trip loss of less than 200000 fs;'}, 'a round trip length of less than 2.3 m; or', 'a combination thereof., 'the optical fibre is characterized by,'}39. The fibre laser of claim 37 , comprising at least one optical element configured to increase a length of the optical cavity.40. The fibre laser of claim 37 , wherein the optical cavity comprises a modelocking mechanism.41. The fibre laser of claim 37 , wherein the optical cavity is configured to provide claim 37 ,pulses characterized by a duration of less than 1 ps;an average power exceeding 500 mW;a repetition rate greater than 300 MHz; ora combination of any of the foregoing.42. The fibre laser of claim 37 , ...

Подробнее
Номер записи: 31
25-02-2016 дата публикации

193nm Laser And An Inspection System Using A 193nm Laser

Номер: US20160056606A1
Автор: Armstrong J. Joseph, Chuang Yung-Ho, Dribinski Vladimir, Fielden John, Liou Justin Dianhuan
Принадлежит: KLA-TENCOR CORPORATION

An improved laser uses a pump laser with a wavelength near 1109 nm and a fundamental wavelength near 1171 nm to generate light at a wavelength between approximately 189 nm and approximately 200 nm, e.g. 193 nm. The laser mixes the 1109 nm pump wavelength with the 5harmonic of the 1171 nm fundamental, which is at a wavelength of approximately 234.2 nm. By proper selection of non-linear media, such mixing can be achieved by nearly non-critical phase matching. This mixing results in high conversion efficiency, good stability, and high reliability. 1. A laser for generating light , the laser comprising:a pump laser generating a pump frequency having a corresponding wavelength of between approximately 1105 nm and approximately 1130 nm;a fundamental laser generating a fundamental frequency from a portion of the pump frequency, the fundamental frequency having a corresponding wavelength of between approximately 1150 nm and approximately 1175 nm;a fifth harmonic generator module that generates a fifth harmonic of the fundamental frequency; anda frequency mixing module that combines the pump frequency and the fifth harmonic frequency to generate an output wavelength between approximately 189 nm and approximately 200 nm.2. The laser of claim 1 , wherein the fifth harmonic generator comprises a first stage for generating a second harmonic from a portion of the fundamental frequency.3. The laser of claim 2 , wherein the first stage includes a Lithium triborate (LBO) crystal.4. The laser of claim 2 , wherein the fifth harmonic generator further comprises:a second stage for generating a fourth harmonic from the second harmonic; anda third stage for generating the fifth harmonic by combining the fourth harmonic and a portion of the fundamental frequency.5. The laser of claim 4 , wherein at least one of the second and third stages includes at least one of an annealed Cesium Lithium Borate (CLBO) crystal claim 4 , an annealed LBO crystal claim 4 , a hydrogen-annealed CLBO crystal ...

Подробнее
Номер записи: 32
14-02-2019 дата публикации

Mode Mixing Optical Fibers and Methods and Systems Using the Same

Номер: US20190052043A1
Автор: Abramczyk Jaroslaw, Ahmadi Peyman, CONROY MICHAEL, FARLEY Kevin, Jollivet Clemence, Lim Eric, Tankala Kanishka
Принадлежит:

The present disclosure relates more to mode mixing optical fibers useful, for example in providing optical fiber laser outputs having a desired beam product parameter and beam profile. In one aspect, the disclosure provides a mode mixing optical fiber that includes a core having a refractive index profile; and a cladding disposed about the core. The core of the mode mixing optical fiber supports at least two (e.g., at least five) guided modes at the wavelength. The mode mixing optical fiber is configured to substantially distribute optical radiation having the wavelength propagating therein (e.g., input at its input end or generated or amplified within the core) among a plurality of the guided modes (e.g., to distribute a substantial fraction of the optical radiation having the wavelength propagating therein from its lower-order guided modes to its higher-order guided modes). 2. The mode mixing optical fiber according to claim 1 , wherein the mode mixing optical fiber is configured to substantially distribute optical radiation such that at least 10% (e.g. claim 1 , at least 20% claim 1 , at least 30% claim 1 , at least 40% or even at least 50%) of the optical radiation is guided in a mode other than the fundamental mode.3. The mode mixing optical fiber according to or claim 1 , wherein the mode mixing optical fiber can be configured to distribute optical radiation having the wavelength from being substantially guided in the fundamental mode (e.g. claim 1 , at least 70% claim 1 , at least 80% claim 1 , at least 90% or even at least 95% in the fundamental mode claim 1 , preferably at least 90% in the fundamental mode) to being substantially distributed among a plurality of guided modes (e.g. claim 1 , such that at least 10% claim 1 , at least 20% claim 1 , at least 30% claim 1 , at least 40% or even at least 50% claim 1 , preferably at least 50%) of the optical radiation is guided in a mode other than the fundamental mode).4. The mode mixing optical fiber according to ...

Подробнее
Номер записи: 33
25-02-2021 дата публикации

MULTI-WAVELENGTH VISIBLE LASER SOURCE

Номер: US20210057865A1
Автор: Zediker Mark
Принадлежит: Nuburu, Inc.

Methods and system to provide high power and brightness display and illumination systems and methods. In embodiments multi-wavelength laser beams in the wavelength range of 300 nm to 700 nm, including high power beams in these wavelengths having excellent beam qualities are provided and used. The three wavelengths can be primary colors, red, green and blue. Manufacturing and display systems, allowing the high-power white light generation directly from a single fiber laser source, such as theaters, sporting events, public events, private and home entertainment to name a few. The systems are configured for Photopic and Scotopic vision. 1. A multi-wavelength visible fiber laser source comprising ,a. Pumped by high power blue laser diodesb. Nested Raman oscillators to create multiple wavelength outputsc. Fiber Bragg Gratings provide the mode filter element in the fiber laser.2. The laser in where the high-power blue laser diodes are launched into the clad of the Raman oscillator.3. The laser in where the high-power blue laser diodes are spectrally beam combined and launched into the clad of the Raman oscillator.4. The laser in has a high numerical aperture clad surrounding a step index single mode core with the core to clad ratio ranging from 1:2 claim 1 , 1:4 claim 1 , 1:6 claim 1 , 1:10 or higher.5. The laser in has a high numerical aperture clad surrounding a graded index core with a core to clad ratio ranging from 1:2 claim 1 , 1:4 claim 1 , 1:6 claim 1 , 1:10 or higher.6. The laser in has a Fiber Bragg Grating written directly in the step index core.7. The laser in has a Fiber Bragg Grating written directly in the graded index core.8. The laser in has external optics that form a resonator.9. The laser in has a sequence of Fiber Bragg Gratings that define a single shifted output wavelength.10. The laser in has a sequence of Fiber Bragg Gratings that defines multiple cavities which results in multiple output wavelengths.11. The laser in has a high numerical aperture ...

Подробнее
Номер записи: 34
01-03-2018 дата публикации

BACK-REFLECTION PROTECTION AND MONITORING IN FIBER AND FIBER-DELIVERED LASERS

Номер: US20180059343A1
Автор: Kliner Dahv A.V.
Принадлежит: NLIGHT PHOTONICS CORPORATION

A system includes an optical fiber situated to propagate a laser beam received from a laser source to an output of the optical fiber, a first cladding light stripper optically coupled to the optical fiber and situated to extract at least a portion of forward-propagating cladding light in the optical fiber, and a second cladding light stripper optically coupled to the optical fiber between the first cladding light stripper and the optical fiber output and situated to extract at least a portion of backward-propagating cladding light in the optical fiber. 1. A system , comprising:an optical fiber situated to propagate a laser beam received from a laser source to an output of the optical fiber;a first cladding light stripper optically coupled to the optical fiber and situated to extract at least a portion of forward-propagating cladding light in the optical fiber; anda second cladding light stripper optically coupled to the optical fiber between the first cladding light stripper and the optical fiber output and situated to extract at least a portion of backward-propagating cladding light in the optical fiber.2. The system of claim 1 , further comprising:a heat sink situated to receive and absorb the forward-propagating cladding light and the backward-propagating cladding light extracted by the first and second cladding light strippers, respectively.3. The system of claim 1 , further comprising:a detection chamber optically situated between the first and second cladding light strippers.4. The system of claim 1 , further comprising:a beam directing optical system situated to receive the laser beam from the output of the optical fiber.5. The system of claim 4 , wherein the beam directing optical system includes an output beam combiner situated to combine the received laser beam with one or more other laser beams.6. The system of claim 1 , wherein less than about 10% of the forward-propagating cladding light and less than about 10% of the backward-propagating cladding light ...

Подробнее
Номер записи: 35
04-03-2021 дата публикации

FIBER AMPLIFIER SYSTEM RESISTANCE TO NONLINEAR SPECTRAL BROADENING AND DECOHERENCE

Номер: US20210063635A1
Автор: Goodno Gregory D.
Принадлежит:

A method for reducing nonlinear frequency shifts and suppressing stimulated Brillouin scattering (SBS) in a fiber laser amplifier system. The method includes providing a seed beam having a certain wavelength and frequency modulating the seed beam with an RF waveform to spectrally broadening the seed beam, where the RF waveform is a relatively slow-speed waveform having a large modulation depth. The method also includes amplifying the frequency modulated seed beam with an amplifier having a large nonlinear phase shift and exhibiting frequency modulation (FM) to amplitude modulation (AM) conversion, where the modulation depth is much larger than the nonlinear phase shift of the amplifier. 1. A method for reducing nonlinear frequency shifts and suppressing stimulated Brillouin scattering (SBS) in a fiber laser amplifier system , said method comprising:providing at least one seed beam having a certain wavelength;frequency modulating the at least one seed beam with an RF waveform to spectrally broaden the seed beam, said RF waveform being a relatively slow-speed waveform having a large modulation depth; andamplifying the modulated seed beam with an amplifier having a large nonlinear phase shift and exhibiting frequency modulation (FM) to amplitude modulation (AM) conversion, wherein the modulation depth is much larger than the nonlinear phase shift.2. The method according to wherein frequency modulating the at least one seed beam with an RF waveform includes frequency modulating the at least one seed beam with a piecewise parabolic RF waveform.3. The method according to wherein frequency modulating the at least one seed beam with an RF waveform includes frequency modulating the at least one seed beam with a single tone RF waveform.4. The method according to wherein the frequency of the single tone RF waveform is 100 MHz.5. The method according to further comprising splitting the frequency modulated seed beam into a plurality of split frequency modulated seed beams claim ...

Подробнее
Номер записи: 36
03-03-2016 дата публикации

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

Номер: US20160064891A1
Автор: FERMANN Martin E., Imeshev Gennady
Принадлежит:

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

Подробнее
Номер записи: 37
28-02-2019 дата публикации

FIBER SELECTOR AND LASER APPARATUS

Номер: US20190064441A1
Автор: MATSUDA Munekazu, TAKIGAWA Hiroshi
Принадлежит: FANUC Corporation

A fiber selector includes: a plurality of first reflecting members corresponding to a plurality of focusing optical systems which focus a laser beam from a collimating optical system, and equipped with a reflecting surface capable of reflecting the laser beam towards the focusing optical system; a rotary motor that rotationally moves the first reflecting member between a first position at which the laser beam reflects and a second position which does not block the laser beam, in which the fiber selector rotationally moves the plurality of first reflecting members between the first position and second position so as to selectively switch the propagating direction of the laser beam to any of the plurality of focusing optical systems, in which the reflecting surface of the first reflecting member is a plane perpendicular to the rotation axis of the shaft to which this first reflecting member is fixed, and is arranged so as to face the direction of the rotary motor that causes the shaft to which this first reflecting member is fixed to rotate. 1. A fiber selector comprising:a collimating optical system that converts a laser beam emitted from an input optical fiber into parallel light;a plurality of focusing optical systems that focuses the laser beam on an output optical fiber;a plurality of first reflecting members provided to correspond to the plurality of the focusing optical systems, and including a reflecting surface that can reflect the laser beam from the collimating optical system towards the focusing optical system; anda rotary motor provided to correspond to a plurality of the first reflecting members, and causing the first reflecting member to rotationally move between a first position at which the laser beam reflects by the reflecting surface towards the focusing optical system, and a second position not blocking the laser beam,wherein the fiber selector selectively switches a propagating direction of the laser beam incident from the collimating optical ...

Подробнее
Номер записи: 38
17-03-2022 дата публикации

780 nm ULTRASHORT-PULSED FIBER LASER

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

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

Подробнее
Номер записи: 39
10-03-2016 дата публикации

Ruggedized Fiber Optic Laser for High Stress Environments

Номер: US20160072248A1
Автор: Benjamin R. Johnson, Michael J. Shaw, Tyler Forbes
Принадлежит: BAE Systems Information and Electronic Systems Integration Inc

A fiber optic laser for use in high stress environments is provided. The fiber optic laser comprises a hollow spool structure housing a fiber in a spiral groove in an interior surface of said hollow spool structure, wherein the fiber is mechanically supported along an entirety of its length within the hollow spool structure. Fluid channels are formed within the hollow spool structure, wherein a quantity of coolant is movable through the fluid channels to provide high-precision thermal management of the fiber.

Подробнее
Номер записи: 40
10-03-2016 дата публикации

Optical Amplifier and Optical Transmission System

Номер: US20160072254A1
Автор: SUZUKI Mikiya
Принадлежит:

An optical amplifying apparatus that amplifies an optical signal, including an input section whereto the optical signal is inputted, a laser light source that generates laser light, the laser light source including an uncooled semiconductor laser device, an optical fiber that amplifies the optical signal by a stimulated emission based on the laser light from the laser light source, an output section that outputs the optical signal amplified by the optical fiber, and a passive optical component disposed between the optical fiber and the output section. The laser light source is thermally coupled to the optical fiber and/or the passive optical component via a thermally conductive medium. An oscillating wavelength of the laser light source is varied by increasing a temperature of the laser light source with heat generated by the optical fiber and/or the passive optical component. 1. An optical amplifying apparatus that amplifies an optical signal , comprising:an input section whereto the optical signal is inputted;a laser light source that generates multimode laser light propagating in a multimode, the laser light source including a multimode semiconductor laser device with no electronic cooling element;a double-clad optical fiber that amplifies the optical signal by a stimulated emission based on the multimode laser light from the laser light source;an output section that outputs the optical signal amplified by the double-clad optical fiber;a passive optical component disposed between the double-clad optical fiber and the output section; anda thermally conductive medium,the double-clad optical fiber being mounted on the thermally conductive medium, the double-clad optical fiber being configured to heat the thermally conductive medium by propagation of the multimode laser light,the laser light source being mounted on the thermally conductive medium so as to be heated by the double-clad optical fiber via the thermally conductive medium,an oscillating wavelength of the ...

Подробнее
Номер записи: 41
16-03-2017 дата публикации

MEDICAL LASER LIGHT SOURCE SYSTEM

Номер: US20170071695A1
Автор: Aoki Akira, IZUMI Yuichi, NAGASAKA Keigo, NAKAJIMA Sadahiro, SAITO Norihito, WADA Satoshi, YUMOTO Masaki
Принадлежит:

A medical laser light source system including an excitation laser light source apparatus that generates first excitation light having a wavelength greater than or equal to 1.5 μm and less than or equal to 2.2 μm and second excitation light having a wavelength greater than or equal to 1.5 μm and less than or equal to 2.2 μm and differing from the first excitation light with respect to at least one of oscillation energy intensity, oscillation pulse width, repeating frequency, and peak power; an optical fiber that is long-distance and propagates the first excitation light and the second excitation light generated by the excitation laser light source apparatus; and a laser device that generates laser light having a wavelength of at least 2.7 μm and no greater than 3.2 μm, using at least one of the first excitation light and the second excitation light emitted from the optical fiber. 1. A medical laser light source system comprising:an excitation laser light source apparatus that generates first excitation light having a wavelength greater than or equal to 1.5 μm and less than or equal to 2.2 μm and second excitation light having a wavelength greater than or equal to 1.5 μm and less than or equal to 2.2 μm and differing from the first excitation light with respect to at least one of oscillation energy intensity, oscillation pulse width, repeating frequency, waveform and peak power;an optical fiber that propagates the first excitation light and the second excitation light generated by the excitation laser light source apparatus; anda laser device that generates a first laser light having a wavelength greater than or equal to 2.7 μm and less than or equal to 3.2 μm, excited by the first excitation light emitted from the optical fiber, and that generates a second laser light excited by the second excitation light, having a wavelength greater than or equal to 2.7 μm and less than or equal to 3.2 μm wherein at least one of oscillation energy intensity, oscillation pulse width ...

Подробнее
Номер записи: 42
16-03-2017 дата публикации

RECOVERING A RARE-EARTH-DOPED OPTICAL FIBER UNDER IRRADIATION

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

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

Подробнее
Номер записи: 43
16-03-2017 дата публикации

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

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

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

Подробнее
Номер записи: 44
24-03-2022 дата публикации

LASER DEVICE

Номер: US20220094132A1
Автор: Chiba Yasuto, Hasunuma Takashi, Kiyoyama Wataru, Sakamoto Shinichi, Yamaguchi Yutaka
Принадлежит: FUJIKURA LTD.

A laser device includes at least one light source; a delivery fiber that is configured to propagate of laser light emitted from the light source; and a first light detection unit and a second light detection unit configured to detect a part of light propagating in a direction opposite to a propagation direction of the laser light through the delivery fiber. The first light detection unit detects first light included in a wavelength band of visible light. The second light detection unit detects second light included in a wavelength band of near-infrared light. 1. A laser device comprising:a light source;a delivery fiber that propagates laser light emitted from the light source; anda first light detector and a second light detector that detect a part of light propagating in a direction opposite to a propagation direction of the laser light through the delivery fiber, whereinthe first light detector detects a first light in a wavelength band of visible light, andthe second light detector detects a second light in a wavelength band of near-infrared light.2. The laser device according to claim 1 , further comprising: is optically coupled to the delivery fiber, and', 'propagates part of the light propagating in the direction opposite to the propagation direction, wherein', 'one end portion of the monitor fiber is connected to the first light detector, and', 'the second light detector is a Rayleigh monitor that faces an outer peripheral surface of the monitor fiber., 'a monitor fiber that3. The laser device according to claim 2 , wherein the first light detector comprises: a lower reflectance of the first light than the second light, and', 'a higher transmittance of the first light than the second light, and, 'a near-infrared light reflection type mirror that hasa photoelectric converter on which light transmitted through the near-infrared light reflection type mirror is incident.4. The laser device according to claim 2 , wherein the first light detector comprises:a ...

Подробнее
Номер записи: 45
05-03-2020 дата публикации

PULSE CONFIGURABLE FIBER LASER UNIT

Номер: US20200076151A1
Автор: BORDENYUK Andrey, Lozovoy Vadim, PESTOV Dmitry, Samartsev Igor
Принадлежит:

A pulse configurable laser unit is an environmentally stable, mechanically robust, and maintenance-free ultrafast laser source for low-energy industrial, medical and analytical applications. The key features of the laser unit are a reliable, self-starting fiber oscillator and an integrated programmable pulse shaper. The combination of these components allows taking full advantage of the laser's broad bandwidth ultrashort pulse duration and arbitrary waveform generation via spectral phase manipulation. The source can routinely deliver near-TL, sub-60 fs pulses with megawatt-level peak power. The output pulse dispersion can be tuned to pre-compensate phase distortions down the line as well as to optimize the pulse profile for a specific application. 1. A pulse configurable laser unit (PCLU) outputting uniform ultrashort pulses , comprising:a fiber pulse generator operating in a plurality of operational regimes to output a train of coherent uniform amplified giant chirped broadband pulses along a light path;a two-stage compressor including a static compressor, which is configured to compensate for a linear chirp component of each giant chirped broadband pulse, and a pulse shaper which is provided with a programmable spatial light modulator (SLM) to correct for a non-linear chirp component of the giant chirped broadband pulse, wherein the two-stage compressor outputs a train of transform limited (TL) ultrashort coherent pulses in each of the operational regimes of the fiber pulse laser generator; andat least one or more computers executing a software for selectively retrieving a phase mask corresponding to a given operational regime from a library of phase masks, which is stored in a memory of the CPU, and operating the pulse shaper to apply the retrieved mask across to the programmable spatial light modulator (SLM) of the pulse shaper so as to compensate for the nonlinear chirp component of the chirped pulse of the compressed TL ultrashort coherent pulses.2. The PCLU ...

Подробнее
Номер записи: 46
26-03-2015 дата публикации

COMPACT TWO-STAGE OPTICAL AMPLIFIER

Номер: US20150086199A1
Автор: Fontaine Nicolas K., Neilson David, Ryf Roland
Принадлежит: ALCATEL -LUCENT USA, INC.

Various exemplary embodiments relate to an optical amplifier, including: a multicore rare-earth doped optical fiber with a first plurality of cores associated with a first stage of the optical amplifier and a second plurality of cores associated with a second stage of the optical amplifier; a three dimensional (3D) waveguide configured to couple input space division multiplexed (SDM) channels into the first plurality of cores at a first end of the multicore rare-earth doped optical fiber and to couple channels from the second plurality of cores to output SDM channels; a reflector configured to optically interconnect the first plurality of cores to the second plurality of cores; and pump laser coupled to the multicore rare-earth doped optical fiber configured to produce laser pump light to pump the multicore rare-earth doped optical fiber. 1. An apparatus comprising:an optical amplifier, further comprising:a multicore rare-earth doped optical fiber with a first plurality of optical cores therein;an optical coupler capable of coupling light from an end of a first optical fiber or optical first fiber cable into a first end face of the multicore rare-earth doped optical fiber and being capable of coupling light from the first end face of the multicore rare-earth doped optical fiber into an end of a second optical fiber or second optical fiber cable; andan optical reflector configured to receive light from a second end face of the multicore rare-earth doped optical fiber and to redirect a portion of the received light back into the second end face of the multicore rare-earth doped optical fiber.2. The apparatus of claim 1 , wherein the optical cores comprise a first set of the optical cores and a different second set of the optical cores; andwherein the optical amplifier is configured such that the first set of optical cores guides light received from the optical coupler and such that the second set of optical cores guides light received from the optical reflector.3. The ...

Подробнее
Номер записи: 47
31-03-2022 дата публикации

THERAPEUTIC SYSTEMS, DEVICES, AND COMPOSITIONS WITH WOUND HEALING AND TISSUE REGENERATIVE PROPERTIES, USES THEREOF, AND CORRESPONDING METHODS

Номер: US20220096605A1
Автор: Kalmeta Margaret V.
Принадлежит:

Presented herein are compositions that can be administered to a subject having damaged tissue, for example a wound. The compositions are often administered in combination with administration of energy (e.g., laser energy, light from a light emitting diode, radiofrequency (RF) energy, audio frequency energy, etc.) from an energy generating device and/or system to the affected site. The compositions, systems, devices, and methods herein were found to induce wound healing and tissue regeneration. 1. A composition with wound healing and tissue regenerative properties , the composition comprising two or more of , or three or more of:a. collagenb. hyaluronic acidc. fucose,d. copper, ande. iron.2. The composition of claim 1 , wherein the collagen comprises collagen fibers.3. The composition of claim 1 , wherein the collagen comprises partially or completely hydrolyzed collagen.4. The composition of any one of claim 1 , wherein the collagen is acid treated collagen.5. The composition of any one of claim 1 , wherein the copper comprises a copper salt.6. The composition of claim 5 , wherein the copper salt comprises CuClor CuCl.7. The composition of any one of claim 1 , wherein the iron comprises an iron salt.8. The composition of claim 7 , wherein the iron salt comprises FeCl.9. The composition of any one of claim 1 , wherein the composition has a pH in a range of 1 to 4 claim 1 , or 2 to 3.10. The composition of any one of claim 1 , wherein the composition comprises a water content in a range of 0% to 20% claim 1 , or 0% to 10% claim 1 , or 0% to 5% (wt/wt).11. A system configured to be used to treat and/or generate tissue claim 1 , the system comprising:a device configured to generate one or more types of therapeutic energy for provision to the tissue, the one or more types of therapeutic energy comprising one or more of laser radiation, radio frequency (RF) waves, audio frequency waves, or light from a light emitting diode (LED); anda composition with wound healing and/or ...

Подробнее
Номер записи: 48
12-03-2020 дата публикации

OPTICAL FIBER SPLICE ENCAPSULATED BY A CLADDING LIGHT STRIPPER

Номер: US20200081182A1
Автор: Hampton Shaun, Hawke Ryan, Kokki Teemu, Luetjen Chris
Принадлежит: nLIGHT, Inc.

Spliced multi-clad optical fibers with a cladding light stripper (CLS) encapsulating the splice. The splice may facilitate conversion between two optical fibers having different architectures, such as different core and/or cladding dimensions. The CLS may comprise a first length of fiber on a first side of the splice, and a second length of fiber on a second side of the splice, encapsulating the splice within the lengths of the CLS. The splice may abut one or more of the lengths of the CLS, or may be separated from one or more lengths of the CLS by an intermediate length of a first and/or second fiber joined by the splice. 1. An optical fiber system , comprising:one or more cladding light strippers (CLS);a first multi-clad fiber;a second multi-clad fiber coupled to the first multi-clad fiber through a splice therebetween, wherein the one or more CLS comprise a first length of fiber on a first side of the splice, and a second length of fiber on a second side of the splice.2. The optical fiber system of claim 1 , wherein:the first multi-clad fiber comprises a cladding of a first diameter surrounding a core of a second diameter;the second multi-clad fiber comprises a cladding of a third diameter surrounding a core of a fourth diameter; and the first and third diameters are different; or', 'the second and fourth diameters are different., 'wherein at least one of3. The optical fiber system of claim 2 , wherein the first and third diameters are different claim 2 , and the splice is a differential cladding splice.4. The optical fiber system of claim 3 , wherein the second and fourth diameters are different.5. The optical fiber system of claim 2 , wherein the second and fourth diameters are different.6. The optical fiber system of claim 2 , wherein the first multi-clad fiber is a first double clad fiber and the second multi-clad fiber is a second double clad fiber.7. The optical fiber system of claim 1 , wherein the splice is at an end of at least one of the first length of ...

Подробнее
Номер записи: 49
31-03-2022 дата публикации

Optical amplification device and optical amplification method

Номер: US20220102932A1
Автор: Satoshi Mikami
Принадлежит: NEC Corp

To limit the number of excitation laser diodes (LDs) in an optical amplification device provided with a redundant excitation LD configuration, the optical amplification device is provided with: an excitation unit which outputs a plurality of excitation lights generated by a plurality of excitation light sources; a first distributing unit of which inputs are connected to the plurality of excitation light sources and which branches input lights and then outputs branched lights as a plurality of first distributed lights; a plurality of second distributing units of which inputs are connected to the first distributing unit and which combines and branches input lights and then outputs branched lights as a plurality of second distributed lights; and a plurality of gain mediums which are respectively excited by the plurality of second distributed lights.

Подробнее
Номер записи: 50
31-03-2016 дата публикации

High-Gain Operation of Fiber Lasers at Long Wavelengths

Номер: US20160094005A1
Автор: Moulton Peter F., Stegeman Robert
Принадлежит:

A method of operating a Tm:doped fiber amplifier including selecting a length of Tm:doped optical fiber to be less than one hundred meters, doping the optical fiber with active ions at a doping level of greater than one percent, optically pumping the doped optical fiber with a first laser beam having a wavelength longer than the wavelength where a maximum absorption cross section is provided by the active ions, and creating a population inversion between two active ion energy levels with the first laser beam, the active ions providing a gain to a second laser beam. 1. A method of operating a Tm:doped fiber amplifier , the method comprising:selecting a length of Tm:doped optical fiber to be less than one hundred meters;doping the optical fiber with active ions at a doping level of greater than one percent;optically pumping the doped optical fiber with a first laser beam having a wavelength longer than the wavelength where a maximum absorption cross section is provided by the active ions; andcreating a population inversion between two active ion energy levels with the first laser beam, the active ions providing a gain to a second laser beam.2. The method of further comprising selecting a length of the Tm:doped optical fiber to be less than fifty meters.3. The method of further comprising doping the optical fiber with active ions at a doping level of greater than 4.5 percent.4. The method of further comprising doping the optical fiber with active ions at a doping level of greater than 7 percent.5. The method of wherein the first laser beam has a wavelength equal to or longer than 1930 nm.6. The method of wherein the second laser beam has a wavelength equal to or longer than 2000 nm.7. A method of operating a Yb:doped fiber amplifier claim 1 , the method comprising:selecting a length of Yb:doped optical fiber to be less than one hundred meters;doping the optical fiber with active ions at a doping level of greater than one percent;optically pumping the doped optical ...

Подробнее
Номер записи: 51
31-03-2016 дата публикации

LASER DEVICE, IGNITION SYSTEM, AND INTERNAL COMBUSTION ENGINE

Номер: US20160094009A1
Автор: Arai Nobuyuki, Hagita Kentaroh, Higashi Yasuhiro, Izumiya Kazuma, Jikutani Naoto, Numata Masayuki, SUZUDO Tsuyoshi
Принадлежит:

A laser device is provided including a surface emitting laser array configured to emit light, an optical system disposed in an optical path of light that is emitted from the surface emitting laser, a laser resonator which the light passed through the optical system enters, where the optical system includes a first optical element configured to collimate the light emitted from the surface emitting laser, and a second optical element configured to collect and condense the light collimated by the first optical element. 1. A laser device comprising:a surface emitting laser array configured to emit light;an optical system disposed in an optical path of light that is emitted from the surface emitting laser; anda laser resonator which the light passed through the optical system enters; a first optical element configured to collimate the light emitted from the surface emitting laser, and', 'a second optical element configured to collect and condense the light collimated by the first optical element., 'wherein the optical system includes'}2. The laser device according to claim 1 , whereinthe surface emitting laser includes a plurality of light-emitting units, andthe first optical element is a microlens array including a plurality of lens units that correspond to the plurality of light-emitting units of the surface emitting laser.3. The laser device according to claim 1 , wherein the laser resonator is a Q-switched laser.4. The laser device according to claim 3 , wherein the laser resonator includes a laser medium and a saturable absorber.5. The laser device according to claim 4 , whereinthe laser medium is a YAG crystal where Nd is doped, andthe saturable absorber is a YAG crystal where Cr is doped.6. The laser device according to claim 4 , wherein the laser resonator is a composite crystal.7. The laser device according to claim 1 , wherein the laser resonator is made of ceramic.8. The laser device according to claim 1 , further comprising: a transmission member configured ...

Подробнее
Номер записи: 52
05-04-2018 дата публикации

FIBER LASER FIBER PACKAGING AND THERMAL MANAGEMENT

Номер: US20180097333A1
Автор: Fanning C. Geoffrey, Hodges Aaron Ludwig, Luetjen Christopher
Принадлежит: nLIGHT, Inc.

A fiber laser system comprises a main body, wherein the main body includes one or more fiber laser system components and a first wall hingedly attached to the main body along a first edge, the first wall having a first wall open position and a first wall closed position and a plurality of feed fiber management and splicing components mounted to the first wall. Additionally and/or alternatively, the laser system may comprise a cooling plate hingedly attached to the main body, the cooling plate has a cooling plate open position and a cooling plate closed position. Additionally and/or alternatively, the laser system may include a fiber management tray hingedly mounted to the cooling plate, the fiber management tray having a fiber management tray open position and a fiber management tray closed position. 1. A fiber laser system , comprising:a main body, wherein the main body includes one or more fiber laser system components;a first wall hingedly attached to the main body along a first edge, the first wall having an open position and a closed position; anda plurality of feed fiber management and splicing components mounted to the first wall.2. The laser system of claim 1 , wherein the plurality of feed fiber management and splicing components includes a feed fiber splice block removably mounted to an interior surface of the first wall.3. The laser system of claim 1 , wherein the first wall defines an aperture configured to guide a feed fiber from a top surface of the first wall to an interior surface of the first wall.4. The laser system of claim 1 , further comprising a feed fiber entry housing mounted to the first wall and having a face that is situated at a non-zero angle to a top surface of the first wall claim 1 , wherein an entry housing face defines an aperture configured to guide a feed fiber from the top surface of the first wall to an interior surface of the first wall.5. The laser system of claim 2 , wherein the plurality of feed fiber management and splicing ...

Подробнее
Номер записи: 53
12-05-2022 дата публикации

LASER ASSEMBLY FOR AN OPTOACOUSTIC PROBE

Номер: US20220149585A1
Автор: Do Tam, Saenz Xavier
Принадлежит: Seno Medical Instruments, Inc.

A laser assembly is provided that includes a laser resonator that emits a first light having a first pulse width, and a trigger assembly electrically coupled to the laser resonator to actuate the laser resonator. The laser assembly also includes a sensor configured to detect the first light as the light emits from the laser resonator, and one or more processors coupled to the trigger assembly. The one or more processors are configured to obtain a first time delay interval from when the trigger assembly is actuated to when the sensor detects the first light, and actuate the laser resonator to emit a second light having a second pulse width based on the time delay interval determined. 1. A laser assembly comprising:a laser resonator that emits a first light having a first pulse width;a trigger assembly electrically coupled to the laser resonator to actuate the laser resonator;a sensor configured to detect the first light as the light emits from the laser resonator; obtain a first time delay interval from when the trigger assembly is actuated to when the sensor detects the first light; and', 'actuate the laser resonator to emit a second light having a second pulse width based on the time delay interval determined., 'one or more processors coupled to the trigger assembly and configured to2. The laser assembly of claim 1 , wherein the one or more processors are further configured to:obtain a first full width half max pulse width of the first light; andactuate the laser resonator to emit the second light having the second pulse width based on the first full width half max pulse width.3. The laser assembly of claim 2 , wherein the one or more processors actuate the laser resonator to emit the second light based on a proportion between the time delay and the first full width half max pulse width.4. The laser assembly of claim 2 , wherein the one or more processors are further configured to:determine a first pulse-width controller input based on the first full width half max ...

Подробнее
Номер записи: 54
12-04-2018 дата публикации

Extending System Reach of Unrepeated Systems Using Cascaded Amplifiers

Номер: US20180102626A1
Автор: Ezra Ip, Fatih Yaman, Shaoliang Zhang, Yue-Kai Huang
Принадлежит: NEC Laboratories America Inc

An unrepeatered transmission system includes a receiver coupled to a receive span; a transmitter coupled to the receive span; and a plurality of cascaded amplifiers in the receive span with dedicated fiber cores to supply one or more optical pumps from the receiver to each amplifier, wherein the plurality of cascaded amplifiers increase system reach by increasing the length of a back span in an unrepeatered link.

Подробнее
Номер записи: 55
23-04-2015 дата публикации

REFLECTOR BASED ON A DIRECTIONALLY COUPLED OPTICAL LOOP

Номер: US20150109661A1
Автор: Krishnamoorthy Ashok V., Li Guoliang, Luo Ying L., Zheng Xuezhe
Принадлежит: ORACLE INTERNATIONAL CORPORATION

An optical device includes an optical reflector based on a coupled-loopback optical waveguide. In particular, an input port, an output port and an optical loop in arms of the optical reflector are optically coupled to a directional coupler. The directional coupler evanescently couples an optical signal between the arms. For example, the directional coupler may include: a multimode interference coupler and/or a Mach-Zehnder Interferometer (MZI). Moreover, destructive interference during the evanescent coupling determines the reflection and transmission power coefficients of the optical reflector. 1. An optical device , comprising: an input port optically coupled to a first arm of the optical reflector;', 'an output port optically coupled to a second arm of the optical reflector;', 'a directional coupler optically coupled to the first arm and the second arm, wherein the directional coupler is configured to evanescently couple the optical signal between the first arm and the second arm; and', 'an optical loop optically coupled to the directional coupler, wherein the optical loop includes a third arm and a fourth arm., 'an optical waveguide configured to convey an optical signal, wherein the optical waveguide includes an optical reflector, and wherein the optical reflector includes2. The optical device of claim 1 , wherein the fourth arm has a coupling power coefficient of X in the optical loop after the directional coupler and the third arm has a coupling power coefficient of Yin the optical loop after the directional coupler.3. The optical device of claim 2 , wherein the input port has a reflection power coefficient of 4XY and the output port has a transmission power coefficient of (X-Y).4. The optical device of claim 1 , wherein a phase difference between the optical signal in the third arm in the optical loop after the directional coupler and the fourth arm in the optical loop after the directional coupler is 180° so that destructive interference occurs in the ...

Подробнее
Номер записи: 56
19-04-2018 дата публикации

MANUFACTURING METHOD OF OPTICAL FIBER AND OPTICAL FIBER

Номер: US20180105462A1
Автор: HOMMA Yuya, SHIMADA Kensaku, Sohma Kazuyuki
Принадлежит: Sumitomo Electric Industries, Ltd.

A manufacturing method of an optical fiber includes forming an optical fiber by forming a plurality of resin-coating layers around a glass fiber including a core part and a cladding part, and forming a marking on an outermost layer, which is a colored layer having pigment, of the plurality of resin-coating layers by melting or scorching a surface of the outermost layer with a laser. 1. A manufacturing method of an optical fiber , comprising:forming a plurality of resin-coating layers around a glass fiber including a core part and a cladding part; andforming a marking on an outermost layer, which is a colored layer having pigment, of the plurality of resin-coating layers by melting or scorching a surface of the outermost layer with a laser.2. The manufacturing method of the optical fiber according to claim 1 , wherein a depth of the marking is equal to or smaller than 3 μm.3. The manufacturing method of the optical fiber according to claim 1 , wherein an effective core area of the optical fiber upon transmission of a signal light having a wavelength 1550 nm is equal to or greater than 125 μm.4. The manufacturing method of the optical fiber according to claim 2 , wherein an effective core area of the optical fiber upon transmission of a signal light having a wavelength 1550 nm is equal to or greater than 125 μm.5. An optical fiber comprising:a glass fiber including a core part and a cladding part: anda plurality of resin-coating layers formed around the glass fiber,wherein a resin layer, which is an outermost layer of the plurality of resin-coating layers, is a colored layer having pigment, andwherein a surface of the colored layer is formed with a marking including a melted portion or a scorched portion.6. The optical fiber according to claim 5 , wherein a depth of the marking is equal to or smaller than 3 μm.7. The optical fiber according to claim 5 , wherein an effective core area of the optical fiber upon transmission of a signal light having a wavelength 1550 nm ...

Подробнее
Номер записи: 57
21-04-2016 дата публикации

High average power integrated optical waveguide laser

Номер: US20160111847A1
Автор: Nunnally William C.
Принадлежит: APPLIED PHYSICAL ELECTRONICS, L.C.

A high power laser whose output is a matrix of individual phase controlled pixels is disclosed, each pixel containing a number of low power, single transverse mode, phase coherent gain channel outputs. Each row of pixels is formed as an optical pump waveguide that is transverse or orthogonal to a number of parallel, longitudinal gain channels integrated within or adjacent to the transverse pump waveguide. Optical pump energy is produced and injected by a number of parallel laser diode bars, located along both longitudinal sides of the pump waveguide. Waste thermal energy from the pump diodes and gain channels is extracted from each laser row by integrating the row pump waveguide, gain channels, and pump diodes within a heat exchanger. 1. A laser , comprising:a. a waveguide center;b. a plurality of gain channels arranged longitudinally along the waveguide center, wherein the plurality of gain channels are separated into a plurality of gain channel groups across the waveguide center;c. a plurality of laser diode bars arranged orthogonally to the plurality of gain channels.2. The laser of claim 1 , wherein each of the plurality of gain channels comprise a cross-sectional area small enough that a single transverse transmission mode is dominate in the gain channels.3. The laser of claim 2 , wherein each of the plurality of gain channels are about 10 microns high and about 10 microns wide.4. The laser of claim 1 , wherein the waveguide center comprises a top side and a bottom side claim 1 , and wherein the laser further comprises a first heat exchanger surface attached at the top side of the waveguide center and a second heat exchanger surface attached at the bottom side of the waveguide center.5. The laser of claim 4 , further comprising a first cladding layer between the waveguide center and the first heat exchanger surface claim 4 , and a second cladding layer between the waveguide center and the second heat exchanger surface.6. The laser of claim 1 , wherein each of ...

Подробнее
Номер записи: 58
21-04-2016 дата публикации

SLANTED FBG FOR SRS SUPPRESSION

Номер: US20160111851A1
Автор: Kliner Dahv A.V., McComb Timothy S.
Принадлежит: NLIGHT PHOTONICS CORPORATION

An example apparatus includes an optical fiber including a core and cladding, the core being situated to propagate an optical beam along a propagation axis associated with the core, and at least one fiber Bragg grating (FBG) situated in the core of the optical fiber, the fiber Bragg grating including a plurality of periodically spaced grating portions situated with respect to the propagation axis so that light associated with Raman scattering is directed out of the core so as to reduce the generation of optical gain associated with stimulated Raman scattering (SRS). 1. An apparatus , comprising:an optical fiber including a core and cladding, the core being situated to propagate an optical beam along a propagation axis associated with the core; andat least one fiber Bragg grating (FBG) situated in the core of the optical fiber, the fiber Bragg grating including a plurality of periodically spaced grating portions situated with respect to the propagation axis so that light associated with Raman scattering is directed out of the core so as to reduce the generation of optical gain associated with stimulated Raman scattering (SRS).2. The apparatus of claim 1 , wherein the plurality of periodically spaced grating portions are situated at a non-perpendicular angle with respect to the propagation axis.3. The apparatus of claim 1 , wherein the at least one FBG is situated within a fiber oscillator defined between a high-reflecting FBG and a partially-reflecting FBG.4. The apparatus of claim 3 , wherein the at least one FBG is situated adjacent to the partially-reflecting FBG.5. The apparatus of claim 4 , wherein the at least one FBG and the partially-reflecting FBG are situated in a passive section of optical fiber that is spliced to an active fiber of the fiber oscillator.6. The apparatus of claim 1 , wherein the at least one FBG comprises a plurality of FBGs spaced apart from each other and distributed along the length of the optical fiber.7. The apparatus of claim 6 , ...

Подробнее
Номер записи: 59
02-06-2022 дата публикации

Counter pumping a large mode area fiber laser

Номер: US20220173567A1
Автор: Brian Michael Schulz, Daniel Scott Schulz, Donald Lee Sipes, JR., James LEFORT, Jason Tafoya
Принадлежит: Optical Engines Inc

A fiber support assembly includes: a first glass tube, wherein the first glass tube is at tached to a microlens or lenslet of a microlens or lenslet array; a second glass tube at least partially disposed within the first glass tube; and a gain fiber disposed within the second glass tube, wherein the gain fiber has a first tapered end cap, and wherein the gain fiber with the first tapered end cap is aligned to the microlens or lenslet attached to the first glass tube. The fiber support assembly may further include: a pump fiber disposed within the second glass tube, wherein the pump fiber has a second tapered end cap; and a reflector configured to receive counter-pumping light from the pump fiber and direct the counter-pumping light to the first tapered end cap of the gain fiber.

Подробнее
Номер записи: 60
20-04-2017 дата публикации

Laser Apparatus with Dispersion Control

Номер: US20170110846A1
Автор: Sell Alexander
Принадлежит: TOPTICA PHOTONICS AG

The invention relates to a laser apparatus comprising a laser radiation source which generates pulsed laser radiation, wherein the laser radiation has spectral components in at least two wavelength ranges that differ from one another—a first wavelength range (W) and a second wavelength range (W)—, and comprising a dispersion control element comprising at least one dielectric multilayer mirror (MCM), wherein the laser radiation is reflected one or more times at the multilayer mirror (MCM). It is an object of the invention to provide a laser apparatus which is improved over the prior art. In particular, the setup thereof should be less complex, require less adjustment outlay and—in particular—be less sensitive to external influences. The invention achieves this object in that the multilayer mirror (MCM) is reflective in the two wavelength ranges (W, W), the reflection of the spectral component in the second wavelength range (W) having a time delay in relation to the reflection of the spectral component in the first wavelength range (W) such that the spectral components of the laser radiation reflected at the multilayer mirror (MCM) in the two wavelength ranges (W, W) coincide in time in an interaction centre of the laser apparatus. Moreover, the invention relates to a dielectric multilayer mirror and a method for generating laser radiation. 112. A laser apparatus comprising a laser radiation source which generates pulsed laser radiation , wherein the laser radiation has spectral components in at least two wavelength ranges that differ from one another—a first wavelength range (W) and a second wavelength range (W)— , and comprising a dispersion control element comprising at least one dielectric multilayer mirror (MCM) , wherein the laser radiation is reflected one or more times at the multilayer mirror (MCM) , wherein{'b': 1', '2', '2', '1', '1', '2, 'the multilayer mirror (MCM) is reflective in the two wavelength ranges (W, W), the reflection of the spectral component ...

Подробнее
Номер записи: 61
11-04-2019 дата публикации

OPTICAL FIBER FOR LIGHT AMPLIFICATION HAVING A CORE WITH LOW BEND LOSS AND END FEATURES WITH HIGH BEND LOSS AND RELATED METHOD

Номер: US20190109430A1
Автор: ROCKWELL David A., SHKUNOV Vladimir V.
Принадлежит:

An apparatus includes an optical fiber configured to transport an optical signal. A cross-section of the optical fiber has a longer slow-axis dimension and a shorter fast-axis dimension. The optical fiber includes a core configured to receive and amplify the optical signal, end features optically coupled to the core at opposite ends of the core, and a cladding surrounding the core and end features. The core has a height in the slow-axis dimension and a width in the fast-axis dimension. Each end feature has a height in the slow-axis dimension and a width in the fast-axis dimension. The core has a lower bend loss than the end features. The optical fiber is configured to confine optical power of a fundamental mode in the core and allow optical power of higher-order mode(s) to leak from the core into the end features. Each end feature's height is less than the core's width. 1. An apparatus comprising: a core configured to receive and amplify the optical signal, the core having a height in the slow-axis dimension and a width in the fast-axis dimension;', 'end features optically coupled to the core at opposite ends of the core, each end feature having a height in the slow-axis dimension and a width in the fast -axis dimension, the core having a lower bend loss than the end features; and', 'a cladding surrounding the core and the end features;, 'an optical fiber configured to transport an optical signal, a cross-section of the optical fiber having a longer slow-axis dimension and a shorter fast-axis dimension, the optical fiber comprisingwherein the optical fiber is configured to confine optical power of a fundamental mode in the core and to allow optical power of one or more higher-order modes to leak from the core into the end features; andwherein the height of each end feature in the slow-axis dimension is less than the width of the core in the fast-axis dimension.2. The apparatus of claim 1 , wherein the optical fiber is bent to allow the optical power in the end ...

Подробнее
Номер записи: 62
04-05-2017 дата публикации

RARE-EARTH DOPED GAIN FIBERS

Номер: US20170125965A1
Автор: Jiang Shibin, Luo Tao, PAN Lei, Wang Qing
Принадлежит:

Rare earth oxides doped multicomponent glass fibers for laser generation and amplification, including a core and a cladding, the core comprising at least 2 weight percent glass network modifier selected from BaO, CaO, MgO, ZnO, PbO, KO, NaO, LiO, YO, or combinations; wherein the mode of the core is guided with step index difference between the core and the cladding, a numerical aperture of the fiber is between 0.01 and 0.04; core diameter is from 60 to 150 micron, and a length of the gain fiber is shorter than 60 cm. 1. An Ytterbium doped multicomponent glass fiber for laser generation and amplification from 1.01 to 1.12 micron wavelength , comprising:a core; anda cladding;wherein said core comprises:at least 2 weight percent glass network modifier selected from BaO, CaO, MgO, ZnO, PbO, K2O, Na2O, Li2O, Y2O3, or combinations thereof; andytterbium oxide at a level from about 3 to about 50 weight percent;wherein:a mode of the core is guided with step index difference between the core and the cladding;a numerical aperture of the fiber is between 0.01 and 0.04;a core diameter is from 60 micron to 150 micron; anda length of the gain fiber is shorter than 60 cm.2. The Ytterbium doped multicomponent glass fiber of claim 1 , wherein said ytterbium oxide is present at a level from about 5 to about 25 weight percent.3. The Ytterbium doped multicomponent glass fiber of claim 1 , wherein the length of the gain fiber is from about 5 cm to about 45 cm.4. The Ytterbium doped multicomponent glass fiber of claim 1 , wherein the multicomponent glass fiber includes a polarization maintaining fiber. This application is a continuation-in-part from U.S. patent application Ser. No.14/605,740, now published as US 2016/0216441, from which it claims priority. The disclosure of application sin 14/605,740 is incorporated herein by reference.This invention relates to rare-earth doped gain fibers.High-power, pulsed fiber lasers are of great interest in applications such as laser micromachining, ...

Подробнее
Номер записи: 63
25-04-2019 дата публикации

LIGHT TRAP FOR HIGH POWER FIBER LASER CONNECTOR

Номер: US20190123505A1
Автор: Karlsen Scott R., Sanders Walter R.
Принадлежит: nLIGHT, Inc.

A fiber laser system includes a fiber laser connector having a housing to terminate a fiber that generates a laser beam. A chamber extends internally along a length of the housing. A light trap includes a plurality of threads formed along a wall of the chamber to trap light reflected back to the fiber laser connector in response to an application of the laser beam to a workpiece. 1. A system , comprising:a fiber connector including a housing, the housing including a first section to terminate a fiber to generate a laser beam and a second different section to encase at least a portion of the fiber;a chamber extending internally along a length of the second section of the housing, wherein a wall of the chamber is optically non-transmissive; anda light trap including plurality of threads formed along the wall of the chamber to trap light reflected back to the fiber connector in response to an application of the laser beam to a workpiece.2. The system of claim 1 , wherein the chamber has a substantially cylindrical cross-section.3. The system of claim 1 , wherein the plurality of threads are helically shaped around the wall of the chamber.4. The system of claim 1 , wherein the plurality of threads are formed to have a substantially uniform pitch between adjacent ones of the plurality of threads.5. The system of claim 1 , wherein the plurality of threads are formed to have a substantially non-uniform pitch between adjacent ones of the plurality of threads.6. The system of claim 1 , wherein the plurality of threads are formed to have a substantially triangle sawtooth contour.7. The system of claim 1 , further comprising:a reflective plating or coating formed on the plurality of threads formed along the wall of the chamber.8. The system of claim 7 , wherein the reflective plating or coating comprises a partial reflector.9. The system of claim 8 , wherein the reflective plating or coating comprises nickel claim 8 , chromium claim 8 , platinum or a combination thereof.10. ...

Подробнее
Номер записи: 64
27-05-2021 дата публикации

PHOTONIC CHIP INTEGRATED WITH A FIBER LASER

Номер: US20210159659A1
Автор: Bandyopadhyay Saumil, Hochberg Michael J.
Принадлежит:

Photonic chip includes an external cavity (EC) optical circuit to provide wavelength-selective optical feedback to a length of active optical fiber. Light generated in the active optical fiber may be coupled from the EC circuit to a light processing circuit of the photonic chip, such as an optical modulator or an optical mixer. The EC circuits may include single-frequency and multi-frequency optical filters, which may include ring resonators, dual-ring resonators, and optical modulators to support multi-frequency lasers. The EC circuits may further include pump combiners and optical isolators. 1. A photonic chip comprising:a light processing circuit;an external cavity (EC) circuit configured for connecting to an active optical fiber (AOF) to form a laser cavity therewith; and,an optical coupler configured to optically couple the EC circuit to the light processing circuit for feeding light produced in the AOF to the light processing circuit.2. The photonic chip of configured for receiving or transmitting light signals claim 1 , wherein the light processing circuit comprises at least one of an optical modulator or an optical mixer.3. The photonic chip of further comprising a pump combiner configured to couple pump light into the EC circuit.4. The photonic chip of comprising one or more EC ports for connecting to the AOF claim 1 , wherein the EC circuit is optically coupled to the one or more EC ports and comprises an optical filter configured to select one or more distinct wavelengths of the light received from the AOF for returning back to the AOF.5. The photonic chip of wherein the one or more EC ports comprise first and second EC ports for connecting to opposite ends of the AOF claim 4 , and wherein the optical filter is disposed in an optical path between the first EC port and the second EC port.6. The photonic chip of wherein the one or more EC ports comprise a bi-directional EC port for connecting to the AOF claim 4 , and wherein the optical filter comprises a ...

Подробнее
Номер записи: 65
12-05-2016 дата публикации

SURFACE-EMITTING LIGHT SOURCE AND LASER APPARATUS

Номер: US20160134076A1
Автор: Arai Nobuyuki, Ikeda Keisuke, Shimizu Kenichi
Принадлежит:

A surface-emitting light source includes a substrate including a light emitting region where plural light emitting points are disposed and a non-light emitting region located around the light emitting region; and a lens array including plural lenses and a non-lens region around the plural lenses. The substrate and the lens array are directly bonded with each other at the non-light emitting region and the non-lens region such that the plural light emitting points and the plural lenses face each other, and the lens array has a linear expansion coefficient not greater than a linear expansion coefficient of the substrate. 1. A surface-emitting light source , comprising:a substrate including a light emitting region where plural light emitting points are disposed and a non-light emitting region located around the light emitting region; anda lens array including plural lenses and a non-lens region around the plural lenses,wherein the substrate and the lens array are directly bonded with each other at the non-light emitting region and the non-lens region such that the plural light emitting points and the plural lenses face each other, andthe lens array has a linear expansion coefficient not greater than a linear expansion coefficient of the substrate.2. The surface-emitting light source of claim 1 , wherein a surface top of each of the plural lenses matches an optical axis of each of the plural light emitting points.3. The surface-emitting light source of claim 1 , wherein the non-light emitting region and the non-lens region are bonded with each other with an adhesive at not less than four portions symmetrical with respect of the center of the light emitting points.4. The surface-emitting light source of claim 1 , wherein each of the plural lenses has a convex surface facing each corresponding one of the light emitting points.5. A laser apparatus claim 1 , comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the surface-emitting light source according to ;'}a ...

Подробнее
Номер записи: 66
21-05-2015 дата публикации

OPTICAL FIBER WITH SMOOTH TIP

Номер: US20150141974A1
Автор: Ashraf Naim, KHACHATUROV ARKADY, Kuka Georg
Принадлежит:

A laser fiber has a distal end having a laser fiber face. A tip addition is attached to or formed onto the fiber face. The material of the tip addition one of fragments or melts when laser energy from a suitable laser device is passed through the laser fiber and through the tip addition. 1. A laser fiber , wherein the laser fiber has a distal end having a laser fiber face;a tip addition attached to the laser fiber face;the material of the tip addition comprising a material which absorbs laser energy and one or more of fragments and melts;wherein, upon impingement of laser energy through the laser to the laser fiber face and to the tip addition, the tip addition one or more of fragments and melts.2. The laser fiber of wherein the tip addition is of a diameter of equal to or greater than the diameter of the laser fiber.3. The laser fiber of wherein the tip addition material is selected from one or more of: epoxy claim 1 , acrylate and UV-cured glues.4. The laser fiber of wherein the tip addition material is curable with UV energy.5. The laser fiber of claim 1 , wherein the tip addition on the laser fiber face is formed with a smooth surface.6. The laser fiber of claim 1 , wherein the tip addition is formed in one of a spherically shaped surface or a hemispherically shaped surface.7. The laser fiber of claim 1 , wherein the tip addition is formed in a curved shaped surface.8. The laser fiber of claim 1 , wherein the tip addition diameter is selected to be greater than the diameter of the laser fiber but of lesser diameter than the interior of an endoscope tube into which it is inserted.9. The laser fiber of claim 1 , wherein the tip addition is selected from one or more of: an epoxy claim 1 , an acrylate claim 1 , or an UV-cured glue.10. The laser fiber of claim 1 , wherein the tip addition is formed of a material which absorbs IR wavelengths of light.11. The laser fiber of claim 1 , wherein the tip addition is formed of a Vitralit® glue.12. The laser fiber of claim 1 ...

Подробнее
Номер записи: 67
03-06-2021 дата публикации

PLUGGABLE OPTICAL MODULE AND OPTICAL COMMUNICATION SYSTEM

Номер: US20210165174A1
Автор: MINOTA Yuuji
Принадлежит: NEC Corporation

In a pluggable optical module, to easily and compactly house an optical fiber for connecting optical components in a housing in which a plurality of optical components are mounted. A pluggable optical module includes a first optical fiber housing unit a second optical fiber housing unit, and a housing. The first optical fiber housing unit can house a first optical fiber connected to a first optical component. The second optical fiber housing unit can house a second optical fiber connected to a second optical component. The housing can house the first optical fiber housing unit and the second optical fiber housing unit. The pluggable optical module is configured to be capable of being inserted into and removed from an optical communication apparatus and the housing constitutes an outer shape of the pluggable optical module. 1. A pluggable optical module comprising:a first optical fiber housing unit configured to be capable of housing a first optical fiber connected to a first optical component;a second optical fiber housing unit configured to be capable of housing a second optical fiber connected to a second optical component; anda housing comprising a housing structure capable of housing the first optical fiber housing unit and the second optical fiber housing unit, whereinthe pluggable optical module is configured to be capable of being inserted into and removed from an optical communication apparatus and the housing constitutes an outer shape of the pluggable optical module.2. The pluggable optical module according to claim 1 , wherein one or both of the first optical fiber housing unit and the second optical fiber housing unit are an optical fiber housing unit configured to house an extra length of a housed optical fiber.3. The pluggable optical module according to claim 2 , wherein one or both of the first optical fiber housing unit and the second optical fiber housing unit contact with the housing and the contacted part is fixed to the housing.4. The pluggable ...

Подробнее
Номер записи: 68
23-04-2020 дата публикации

Supervisory signal paths for an optical transport system

Номер: US20200127735A1
Автор: Ludivine MOIROT, Omar Ait Sab
Принадлежит: Alcatel Submarine Networks SAS

A bidirectional optical repeater having two unidirectional optical amplifiers and a supervisory optical circuit connected to optically couple the corresponding unidirectional optical paths. In an example embodiment, the supervisory optical circuit provides three pathways therethrough for supervisory optical signals, the first pathway being from the output of the first optical amplifier to the input of the second optical amplifier, the second pathway being between the input of the first optical amplifier and the input of the second optical amplifier, and the third pathway being from the output of the second optical amplifier to the input of the first optical amplifier. The pathways are arranged such that the remote monitoring equipment of the corresponding optical transport system can use optical time-domain reflectometry to determine and monitor, as a function of time, the individual gains of the first and second optical amplifiers.

Подробнее
Номер записи: 69
28-05-2015 дата публикации

Method of optimizing multicore optical fiber and devices utilizing same

Номер: US20150147025A1
Автор: Paul S. Westbrook
Принадлежит: OFS FITEL LLC

A method of designing multicore optical fibers is provided. A geometry for the core arrangement is selected. At least one of i) core width, ii) core position with respect to other cores, or iii) orientation with respect to incoming, outgoing, or at least partially traversing radiation such as an inscription beam are optimized. A design space is created in which no core shadows or blocks any other core with respect to incoming, outgoing, or at least partially traversing radiation. Optimization generally includes tracing tangents of core widths against an orthogonal axis and ensuring no overlap of space between said tangents on said axis. For twisted fiber, optimization also includes optimizing effective length and twist rate of the fiber. Devices entailing such fibers, such as multicore pump coupler and multicore fiber distributed feedback laser, are also contemplated.

Подробнее
Номер записи: 70
18-05-2017 дата публикации

FIBER LASER PACKAGING

Номер: US20170141527A1
Автор: Brown Aaron W., Reynolds Mitchell
Принадлежит: nLIGHT, Inc.

Packaging for a fiber laser includes a conduit surrounding the fiber laser and a thermally conductive compound filling a gap between the fiber laser and the conduit setting the fiber laser within the conduit. The fiber laser may have a substantially circular first cross section having a first diameter and the conduit may have a substantially circular second cross section having a second diameter larger than the first diameter of the fiber laser. The conduit may have a splice window cut out from a wall of the conduit and optical potting compound may fix a portion of the fiber laser under the splice window. 1. An apparatus , comprising:a fiber laser;a conduit surrounding the fiber laser; anda compound filling a gap between the fiber laser and the conduit setting the fiber laser within the conduit.2. The apparatus of claim 1 ,wherein the fiber laser comprises a substantially circular first cross section having a first diameter; andwherein the conduit comprises a substantially circular second cross section having a second diameter larger than the first diameter of the fiber laser.3. The apparatus of claim 1 ,{'sup': '2', 'wherein the fiber laser has a power density of greater than 10 kW/mm.'}4. The apparatus of claim 1 ,wherein the conduit comprises aluminum, copper, or steel.5. The apparatus of claim 1 ,wherein the conduit dissipates heat from the fiber laser during operation.6. The apparatus of claim 1 , further comprising:at least one splice window cut out from a wall of the conduit.7. The apparatus of claim 7 , further comprising:optical potting compound to fix a portion of the fiber laser in the splice window.8. A method claim 7 , comprising:cutting a window into a predetermined length of tubing;installing a first predetermined length of fiber laser within a second predetermined length of tubing such that the second predetermined length of tubing substantially surrounds the first predetermined length of fiber laser and such that the fiber laser is visible through ...

Подробнее
Номер записи: 71
10-06-2021 дата публикации

LASER APPARATUS, RESIN DEGRADATION DETECTION METHOD, AND DETECTION METHOD OF OPTICAL POWER

Номер: US20210175676A1
Автор: Sugiyama Naoyuki
Принадлежит: FUJIKURA LTD.

A laser apparatus includes: an optical fiber through which a laser beam propagates; a resin that fixes the optical fiber; a sound sensor that detects a sound produced by the resin that shrinks when a power of light propagating through the optical fiber decreases from its peak value; a storage that stores a threshold relating to a sound produced when the resin shrinks; and a comparison determination part. The comparison determination part compares a detected value representative of the sound detected by the sound sensor to the threshold stored in the storage and determines that the resin has been degraded when the detected value exceeds the threshold. 1. A laser apparatus comprising:an optical fiber through which a laser beam propagates;a resin that fixes the optical fiber in place;a sound sensor that detects a sound produced by the resin that shrinks when power of light propagating through the optical fiber decreases from its peak value;a storage that stores a threshold value; and compares the threshold value to a detected value representative of the sound detected by the sound sensor; and', 'determines that the resin has been degraded when the detected value exceeds the threshold value., 'a comparison determination part that2. The laser apparatus as recited in claim 1 , whereinthe threshold value relates to an amplitude of sound at a specific frequency or in a specific frequency band, andthe laser apparatus further comprises an analysis part that performs a frequency analysis on data representative of the sound detected by the sound sensor and outputs, to the comparison determination part, an amplitude at the specific frequency or in the specific frequency band as the detected value.3. The laser apparatus as recited in claim 1 , further comprising at least one fiber laser connected to the optical fiber.4. A method of detecting degradation of a resin that fixes an optical fiber claim 1 , the method comprising:setting a certain threshold value;detecting a sound ...

Подробнее
Номер записи: 72
24-05-2018 дата публикации

Solar-pumped fiber laser device

Номер: US20180145475A1
Автор: Taizo Masuda
Принадлежит: Toyota Motor Corp

Provided is a solar-pumped fiber laser device that includes: a first layer of a light guiding material or a fluorescent material having a circular or an elliptical planar contour with an even thickness; and an optical fiber wound around a peripheral thickness edge of the first layer, wherein the optical fiber is irradiated with light formed of solar light having entered a flat surface of the planar contour of the first layer, the solar light being scattered by the light guiding material, or with fluorescence generated by applying the solar light having entered the flat surface of the planar contour of the first layer to the fluorescent material.

Подробнее
Номер записи: 73
01-06-2017 дата публикации

OPTICAL SIGNAL WAVEGUIDE DISPERSION FILTER

Номер: US20170155224A1
Автор: Pitwon Richard C.A., Worrall Alexander C.
Принадлежит:

An apparatus includes a curved multimode polymer waveguide having at least one inflection point and a doped region being doped with an amplifying dopant. An optical pump source or electrical pump source is configured to excite the doped region and amplify the optical signal transmitting along the curved multimode polymer waveguide. 1. An apparatus comprising:a curved multimode polymer waveguide having at least two inflection points and a doped region being doped with an amplifying dopant; anda pump source configured to excite the doped region.2. The apparatus of claim 1 , wherein the multimode polymer waveguide transmits a multimode optical signal upstream of the at least one inflection point and transmits a lesser mode optical signal downstream of the at least one inflection point.3. The apparatus of claim 1 , wherein the polymer waveguide has a substantially constant cross-sectional area upstream of the at least one inflection point claim 1 , along the inflection point claim 1 , and downstream of the inflection point.4. The apparatus of claim 1 , wherein the doped region is co-extensive with the curved multimode polymer waveguide.5. The apparatus of claim 1 , wherein the pump source is an optical pump source.6. The apparatus of claim 1 , wherein the pump source is an electrical pump source and the doped region comprises an electroluminescent polymer.7. (canceled)8. The apparatus of claim 1 , wherein the multimode polymer waveguide is curved and has at least one inflection point defining a Fermat's spiral.9. The apparatus of claim 1 , further comprising crosstalk suppression elements adjacent to the at least one inflection point.10. A system comprising:a multimode polymer waveguide having a curved mode stripping path and a doped region being doped with an amplifying dopant, the curved mode stripping path removes one or more higher order optical modes, the multimode polymer waveguide defining a parabolic spiral or a Fermat's spiral that includes the curved mode ...

Подробнее
Номер записи: 74
01-06-2017 дата публикации

FIBER LASER

Номер: US20170155226A1
Автор: Chen Hong, Jiang Feng, Ju Jian, LI Quanfa, Li Wei, Liu Yiran
Принадлежит: Maxphotonics Corporation

The present disclosure discloses a fiber laser, including a laser seed source, an amplifying optical path, an output optical isolator and an optical fiber cylinder; wherein, the amplifying optical path is connected to the laser seed source and the output optical isolator, the laser seed source is used to output optical source, the amplifying optical path includes a first stage amplifying optical path and a second stage amplifying optical path, the first stage amplifying optical path is connected to the laser seed source and the second stage amplifying optical path respectively, the output optical source is output via the output optical isolator after two-stage amplifying; the second stage amplifying optical path comprises a multi-mode active optical fiber; the multi-mode active optical fiber is coiled on the optical fiber cylinder. By the disposing way above, the present disclosure may improve output optical beam quality of the fiber laser. 1. A fiber laser comprising a laser seed source , an amplifying optical path , an output optical isolator and an optical fiber cylinder , wherein ,the amplifying optical path is connected to the laser seed source and the output optical isolator, the laser seed source is used to output optical source, the amplifying optical path includes a first stage amplifying optical path and a second stage amplifying optical path, the first stage amplifying optical path is connected to the laser seed source and the second stage amplifying optical path respectively, the output optical source is output via the output optical isolator after two-stage amplifying;the second stage amplifying optical path comprises a multi-mode active optical fiber;the multi-mode active optical fiber is coiled on the optical fiber cylinder;wherein the fiber laser further comprises an upper casing and a lower casing,the laser seed source and the first stage amplifying optical path are fixed to the upper casing, the second stage amplifying optical path, the output ...

Подробнее
Номер записи: 75
28-08-2014 дата публикации

MULTI-CORE AMPLIFICATION OPTICAL FIBER AND MULTI-CORE OPTICAL FIBER AMPLIFIER

Номер: US20140240819A1
Автор: Aiso Keiichi, MAEDA Koichi, Matsumoto Shigeto, Matsuura Hiroshi, Mimura Yu, Miyabe Ryo, Saito Tsunetoshi, Sugizaki Ryuichi, TSUCHIDA Yukihiro, Watanabe Kengo
Принадлежит: FURUKAWA ELECTRIC CO., LTD.

A multi-core amplification optical fiber includes a plurality of rare-earth-doped core portions and a cladding portion positioned at an outer periphery of the core portions and having refractive index lower than those of the core portions. When a doping concentration of the rare-earth of each of the core portions is 250 ppm to 2000 ppm, a relative refractive index difference of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 μm to 5 μm, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 μm and at equal to or smaller than 60 μm so that a light-crosstalk between the adjacent core portions is equal to or lower than −30 dB. 1. A multi-core amplification optical fiber comprising:a plurality of core portions doped with a rare-earth element; anda cladding portion positioned at an outer periphery of each of the core portions and having refractive index lower than refractive index of each of the core portions, whereinwhen a concentration of the rare-earth element doped to each of the core portions is 250 ppm to 2000 ppm, a relative refractive index difference Δ of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 μm to 5 μm, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 μm and at equal to or smaller than 60 μm so that a crosstalk of light between the adjacent core portions is equal to or lower than −30 dB.2. The multi-core amplification optical fiber according to claim 1 , wherein the separation distance is set at equal to or longer than 45 μm and equal to or shorter than 60 μm so that the crosstalk is equal to or lower than −40 dB.3. The multi-core amplification optical fiber according to claim 1 , ...

Подробнее
Номер записи: 76
28-08-2014 дата публикации

LOW-MODE HIGH POWER FIBER COMBINER

Номер: US20140241385A1
Автор: ABRAMOV Andrey, Fomin Valentin, Mochalov Dmitry
Принадлежит:

A high power fiber laser system is configured with a combiner end fiber spliced to a combiner output fiber. The system further includes a light stripper extending along the combiner end and output fibers and configured with sequentially located zones which are provided with respective refractive indices. In a forward propagating direction of light signal, the upstream zone includes polymeric material with the refractive index higher than that of the cladding of the combiner end fiber. This zone is configured to remove the backreflected core guided light bled into the cladding of the combiner through a splice between combiner end and output fibers. The intermediate zone includes polymeric material configured with a refractive index lower than that of the cladding of the combiner output fiber so it can prevent clad guided signal light from decoupling the cladding under the material. The downstream zone is configured with polymeric material having a refractive index lower than that of the cladding of the combiner output fiber. The polymeric material of the downstream zone is impregnated with a plurality of light diffusers scattering high numerical aperture rays of the clad-guided signal light. 1. A low-mode (“LM”) high power combiner , comprising:a plurality of single mode (“SM”) passive fibers guiding respective SM outputs, the SM fibers being bundled together to define a taper narrowing to an end fiber, the end fiber having a core guiding combined LM signal light in a propagating direction, and at least one cladding;a multitimode combiner output fiber butted to the end fiber to define a splice, the output fiber having a cladding surrounding a core which guides the LM light, the LM light being incident on a workpiece partially reflecting the incident light so that a portion of the reflected light is coupled into the core of the output fiber guiding the reflected light in a counter-propagating direction; anda clad mode absorber (“CMA”) surrounding the end fiber and ...

Подробнее
Номер записи: 77
14-05-2020 дата публикации

Laser based system for cutting transparent and semi-transparent substrates

Номер: US20200147730A1
Автор: Cheng-Hsi Miao
Принадлежит: Vertiled Co Ltd

Disclosed is a system for efficiently cutting a transparent substrate. The system includes a laser source in optical communication with at least one multi-foci optical system. The laser source outputs at least one optical signal to the optical system. The optical system is positioned between the laser source and the substrate to be cut. The optical system includes at least one housing detachably coupled to at least one base member. One or more plate members having one or more apertures formed therein may be coupled to at least one of the housing, the baser member, or both. The aperture formed on the plate member may be configured to permit the optical signal to enter and exit the optical system. Various optical subassemblies may be positioned within or coupled to the optical system.

Подробнее
Номер записи: 78
08-06-2017 дата публикации

OPTICAL POWER MONITOR DEVICE AND OPTICAL POWER MONITOR METHOD

Номер: US20170160167A1
Автор: KASHIWAGI Masahiro
Принадлежит: FUJIKURA LTD.

An optical power monitor device includes a first optical fiber, including a core and a cladding surrounding the core and being at least one of an incidence-side optical fiber and a launch-side optical fiber connected to each other at a connection point, which is constituted by a curve portion and a linear portion between the curve portion and the connection point, a low refractive index layer that is provided in at least a portion of the linear portion on an outer side of the cladding and has a refractive index lower than a refractive index of the cladding, and a first optical detector that is provided at a position close to at least the curve portion. 1. An optical power monitor device comprising:a first optical fiber comprising a core and a cladding surrounding the core, the first optical fiber being at least one of an incidence-side optical fiber and a launch-side optical fiber connected to each other at a connection point and being constituted by a curve portion and a linear portion positioned between the curve portion and the connection point;a low refractive index layer that is provided in at least a part of the linear portion on an outer side of the cladding and has a refractive index lower than a refractive index of the cladding; anda first optical detector that is provided at a position close to the curve portion.2. The optical power monitor device according to claim 1 ,wherein one of the incidence-side optical fiber and the launch-side optical fiber is the first optical fiber, and the other is a second optical fiber constituting the linear portion, andwherein a second optical detector is provided at a position overlapping the second optical fiber when seen in a plan view.3. The optical power monitor device according to claim 1 , further comprising:a supporting member that comprises a groove accommodating the first optical fiber therein; anda filler that is buried in a vicinity of the first optical fiber and has a refractive index equal to or higher than a ...

Подробнее
Номер записи: 79
08-06-2017 дата публикации

FIBER LASER DEVICE

Номер: US20170162998A1
Автор: KASHIWAGI Masahiro
Принадлежит: FUJIKURA LTD.

A fiber laser device () includes an amplification optical fiber () having a core () doped with an active element, a first FBG () reflecting at least a part of light emitted from the active element, and a second FBG () reflecting the light reflected off the first FBG () at a reflectance lower than the reflectance of the first FBG (). The wavelength of a fundamental-mode light beam reflected off the first FBG () and the wavelength of a fundamental-mode light beam reflected off the second FBG () are matched with each other. The wavelengths of higher-mode light beams reflected off the first FBG () and the wavelengths of higher-mode light beams reflected off the second FBG are unmatched with each other. 1. A fiber laser device comprising:an amplification optical fiber having a core doped with an active element that emits light in a pumped state;a first FBG formed on a core of an optical fiber disposed on a first side of the amplification optical fiber, the first FBG reflecting at least a part of light emitted from the active element; anda second FBG formed on a core of an optical fiber disposed on a second side of the amplification optical fiber, the second FBG reflecting the light reflected off the first FBG at a reflectance lower than a reflectance of the first FBG, wherein:a wavelength of a fundamental-mode light beam reflected off the first FBG and a wavelength of a fundamental-mode light beam reflected off the second FBG are matched with each other; andwavelengths of higher-mode light beams reflected off the first FBG and wavelengths of higher-mode light beams reflected off the second FBG are unmatched with each other.2. The fiber laser device according to claim 1 , wherein:the first FBG is formed of a plurality of high-refractive index portions at a predetermined interval, the high-refractive index portion having a refractive index higher than a refractive index of the core on which the first FBG is formed;the second FBG is formed of a plurality of high-refractive ...

Подробнее
Номер записи: 80
08-06-2017 дата публикации

OPTICAL MODE FILTER EMPLOYING RADIALLY ASYMMETRIC FIBER

Номер: US20170162999A1
Автор: Farrow Roger L., Logan David N., McComb Timothy S., Saracco Matthieu
Принадлежит:

Fiber amplifier and/or mode filter including a linearly birefringent LMA fiber coiled at a radius of curvature over a bend length to differentiate a fundamental optical mode from supported higher-order modes through bending losses. The LMA fiber may be a polarization-maintaining (PM) fiber having a variety of geometrical core shapes and cladding configurations. In some embodiments, the birefringent LMA fiber includes a radially asymmetric core that is angularly rotated over a length of the coiled fiber to ensure bending losses are experienced in orthogonally oriented higher-order modes associated with some orientation relative to the core orientation. In some embodiments, the fiber coiling is two-dimensional with bending occurring only about one axis. In some embodiments, an asymmetric core is pre-spun to a predetermined axial spin profile. In some embodiments, angular rotation of the core is achieved through mechanically twisting an un-spun fiber over a length of the coil. 1. A fiber amplifier , comprising:a light source to produce an optical beam; and the LMA fiber has a radially asymmetric core; and', 'the asymmetric core has an angular rotation about a fiber axis over a bend length having a radius of curvature about an axis of curvature, non-parallel to the fiber axis, to attenuate the higher-order modes more than the fundamental mode through bend losses., 'a linearly birefringent large mode area (LMA) fiber coupled to the light source to support a fundamental mode and higher-order modes of the optical beam, wherein2. The fiber amplifier of claim 1 , wherein:the axis of curvature is orthogonal to the fiber axis over the bend length; andthe angular rotation over the bend length has a predetermined spin profile providing a suppression of at least 10 dB/meter of bend length for all higher-order modes.3. The fiber amplifier of claim 2 , wherein the LMA fiber is coiled about the axis of curvature with a fixed radius of curvature over the bend length and a rate of the ...

Подробнее
Номер записи: 81
14-06-2018 дата публикации

Polarization-Maintaining Fiber Device Supporting Propagation In Large Mode Field Diameters

Номер: US20180164499A1
Автор: Ahmad Raja E, DiGiovanni David J, Yan Man F
Принадлежит: OFS FITEL, LLC

A higher-order mode (HOM) fiber is configured as a polarization-maintaining fiber by including a pair of stress rods at a location within the cladding layer that provides for a sufficient degree of birefringence without unduly comprising the spatial mode profile of the propagating higher-order modes. Long-period gratings are used as mode couplers at the input and output of the PM-HOM fiber, where the gratings are formed by exposing areas of the core region orthogonal to the position of the stress rods. The diameter of the stress rods (D) and displacement of the rods from the center of the core region (R) are controlled to yield a configuration with an acceptable birefringence and polarization extinction ratio (PER) within the HOM fiber, even in situations where the fiber is bent (a bend radius less than 50 cm). 1. A polarization-maintaining optical fiber comprisingan inner core, having a first refractive index value and size;an outer core disposed to surround the inner core, the outer core having a second refractive index value different from the first refractive index value;{'sub': 'nm', 'a cladding layer disposed to surround the outer core, the cladding layer having a predetermined refractive index value, the combination of the inner core, outer core, and cladding layer configured such that the inner core and the outer core support the propagation of one or more defined lower-order modes (LOMs) and one or more defined higher-order LPmodes; and'}{'b': 1', '1, 'sub': 'nm', 'a pair of stress rods disposed substantially within the cladding layer on either side of the outer core and arranged along a common axis, defining a slow polarization axis, the pair of stress rods formed of a material having a coefficient of thermal expansion (CTE) different from the cladding layer CTE, where each stress rod exhibits a like diameter D and a like separation R between a center of the inner core and an inner edge of a stress rod, the values of D and R selected to provide a ...

Подробнее
Номер записи: 82
15-06-2017 дата публикации

LIGHT SOURCE DEVICE AND INFORMATION ACQUISITION APPARATUS

Номер: US20170170620A1
Автор: Iwase Hideo
Принадлежит:

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

Подробнее
Номер записи: 83
15-06-2017 дата публикации

LIGHT SOURCE APPARATUS AND INFORMATION ACQUISITION APPARATUS USING SAME

Номер: US20170170621A1
Автор: Miura Shun
Принадлежит:

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

Подробнее
Номер записи: 84
21-05-2020 дата публикации

MULTIMODE FIBER, OPTICAL AMPLIFIER, AND FIBER LASER

Номер: US20200161826A1
Автор: Mimuro Masakuni
Принадлежит: FUJIKURA LTD.

An object is to improve the efficiency of amplification by rare earth ion while maintaining beam quality of output light in a multi-mode fiber doped with rare earth ion. A multi-mode fiber () that includes a rare-earth-ion-doped core and that has a normalized frequency of not less than 2.40 includes a filter portion () that is formed by bending a partial section of or entirety of the multi-mode fiber (), the filter portion () having a smallest diameter (diameter R) that is set so that (1) only LP LP LP and LP modes propagate or only LP and LP modes propagate and (2) a loss of a highest-order one of the modes that propagate is not more than 0.1 dB/m. 1. A multi-mode fiber that comprises a rare-earth-ion-doped core and that has a normalized frequency of not less than 2.40 ,the multi-mode fiber comprising a filter portion that is formed by bending a partial section of or entirety of the multi-mode fiber,{'b': 01', '11', '21', '02', '01', '11, 'the filter portion having a smallest diameter that is set so that (1) only LP, LP, LP, and LP modes propagate or only LP and LP modes propagate and (2) a loss of a highest-order one of the modes that propagate is not more than 0.1 dB/m.'}2. The multi-mode fiber as set forth in claim 1 , wherein:the normalized frequency of the multi-mode fiber is not less than 3.83; and{'b': 01', '11', '21', '02', '02, 'the smallest diameter of the filter portion is set so that only the LP, LP, LP, and LP modes propagate and that a loss of the LP mode is not more than 0.1 dB/m.'}3011111. The multi-mode fiber as set forth in claim 1 , wherein the smallest diameter of the filter portion is set so that only the LP and LP modes propagate and that a loss of the LP mode is not more than 0.1 dB/m.4. The multi-mode fiber as set forth in claim 1 , wherein the filter portion is formed by winding at least a partial section of the multi-mode fiber into a loop form or a coil form.5. An optical amplifier comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1 ...

Подробнее
Номер записи: 85
23-06-2016 дата публикации

Fiber laser assembly and method of generating light

Номер: US20160181756A1
Автор: Kai-Hsiu Liao, Martin H. Muendel, Matthew KUTSURIS, Xiuquan Ma
Принадлежит: Lumentum Operations LLC

A modal instability of a fiber amplifier may be reduced by coupling, e.g. splicing, a length of passive multimode optical fiber to an active multimode optical fiber of the fiber amplifier. Upon launching light into the passive optical fiber, some higher order transversal modes may be excited in the passive optical fiber. The higher-order modes may interfere with the fundamental mode in the passive multimode optical fiber. However, the intermodal interference of the launched modes does not cause thermal gradients in the passive optical fiber. Upon propagation in the passive multimode optical fiber, the excited optical modes may lose mutual coherence, causing a reduction of contrast of the intermodal interference pattern along the doped core of the active optical fiber, effectively reducing modal instability in the active optical fiber.

Подробнее
Номер записи: 86
21-06-2018 дата публикации

FIBER LASER PACKAGING

Номер: US20180175577A1
Автор: Hodges Aaron Ludwig, Reynolds Mitchell Ryan
Принадлежит: nLIGHT, Inc.

A packaged fiber laser may include a wound fiber laser spiral including a metal ribbon having ends, surfaces, and edges; a fiber laser on a first one of the surfaces of the metal ribbon; and a metal sheet coupled to a first one of the edges of the metal ribbon or a second one of the surfaces of the metal ribbon. Packaging for a fiber laser may include a cooling plate coupled to a second one of the edges of the metal ribbon or the second surface of the metal ribbon, the cooling plate including: a casing including a cover, a bottom, and an outer sidewall; flow channels formed inside the casing, the flow channels defined by inner sidewalls of the cooling plate, wherein the cover is coupled to a top of the inner sidewalls to enclose the flow channel; and an inlet to deliver coolant to the flow channels. 1. An apparatus , comprising: a metal ribbon having ends, surfaces, and edges;', 'a fiber laser on a first one of the surfaces of the metal ribbon; and', 'a metal sheet coupled to a first one of the edges of the metal ribbon or a second one of the surfaces of the metal ribbon; and, 'a wound fiber laser spiral, including a cover to enclose flow channels formed inside the cooling plate, wherein the cover is coupled to a top of sidewalls of the flow channels; and', 'an inlet to deliver coolant to the flow channels., 'a cooling plate coupled to a second one of the edges of the metal ribbon or the second surface of the metal ribbon, the cooling plate including2. The apparatus of claim 1 , further comprising a potting compound between the fiber laser and the first surface of the metal ribbon.3. The apparatus of claim 1 , wherein the metal sheet has a same thermal conductivity as the metal ribbon.4. The apparatus of claim 1 , wherein the surfaces of the metal ribbon are planar.5. The apparatus of claim 1 , wherein the surfaces of the metal ribbon are curved.6. The apparatus of claim 1 , wherein the first surface of the metal ribbon defines an enclosure for the fiber laser.7. ...

Подробнее
Номер записи: 87
02-07-2015 дата публикации

METAL-INSULATOR-METAL WAVEGUIDE FOR NANO-LASERS AND OPTICAL AMPLIFIERS

Номер: US20150188280A1
Автор: Hill Martin Terence
Принадлежит:

A metal-insulator-metal (MIM) waveguide structure for nano-lasers or optical amplifiers is described. The structure comprises a substrate on which are supported first and second metal layers which form electrical contacts for the waveguide. A narrow ridge of low-band gap semiconductor core, which forms the optical gain material, is sandwiched between the two metal layers. The semiconductor core is surrounded on both sides by a low refractive index material which is also sandwiched between the two metal layers. First and second layers of thin higher-band gap doped semiconductor material are provided between the respective first and second metal layers and the low-band gap semiconductor core and the low refractive index material. The optical mode that propagates down this waveguide is localised in the centre of the waveguide structure where the narrow ridge of low-band gap semiconductor core is. 1. A metal-insulator-metal (MIM) waveguide structure for nano-lasers or optical amplifiers , the structure comprising:a substrate on which are supported first and second metal layers which form electrical contacts for the waveguide structure; and,a narrow ridge of low-band gap semiconductor core, which forms the optical gain material, sandwiched between the two metal layers and surrounded on both sides by a low refractive index material; and,first and second layers of thin higher-band gap doped semiconductor material provided between the respective first and second metal layers and the low-band gap semiconductor core and the low refractive index material wherein, in use, the gain required to overcome metallic loss in the waveguide is reduced because of the strong refractive index discontinuity at the interface of the optical gain material and low refractive index material.2. A MIM waveguide structure as defined in claim 1 , wherein the waveguide structure further comprises first and second thin dielectric layers respectively provided between the first layer of doped ...

Подробнее
Номер записи: 88
02-07-2015 дата публикации

HIGH-POWER FIBER LASER EMPLOYING NONLINEAR WAVE MIXING WITH HIGHER-ORDER MODES

Номер: US20150188283A1
Автор: Ramachandran Siddharth
Принадлежит:

A high-power fiber laser exploits efficiency and wavelength-conversion of nonlinear wave mixing in a higher-order mode (HOM) fiber providing large effective area and higher-power operation than single-order mode (SMF) fiber. In a “monomode” approach, mixing waves (pump(s), signal, idler) propagate in the same higher-order mode, and in an “intermodal” approach different waves propagate in different modes. The monomode approach can provide high-power wavelength conversion generating output in a desired band where good dopants may be unavailable. The intermodal approach demonstrates coherent combining of outputs of multiple lasers to generate high-power output in a desired band. 1. A fiber laser , comprising:a higher-order-mode (HOM) fiber, the HOM fiber supporting a plurality of guided modes of propagation including higher-order modes, the HOM fiber having a predetermined mode-dependent dispersion characteristic defining a zero-dispersion wavelength for a first higher-order mode, the zero-dispersion wavelength defining a set of respective higher-order modes, wavelengths and phases of constituent optical signals of a predetermined pattern of nonlinear wave mixing in which at least one of the constituent optical signals propagates in the first higher-order mode,an optical signal source having an output coupled to an input point of the HOM fiber and operative to launch a first optical signal into the HOM fiber, the first optical signal being a first one of the constituent optical signals and producing the predetermined pattern of nonlinear wave mixing in the HOM fiber; andan output optical element coupled to an output point of the HOM fiber, the output optical element operative to extract a second optical signal from the HOM fiber, the second optical signal being a second one of the constituent optical signals and produced by the pattern of nonlinear wave mixing, the second optical signal propagating in a second higher-order mode of the set of modes defined by the zero- ...

Подробнее
Номер записи: 89
08-07-2021 дата публикации

Optical module and erbium-doped fiber amplifier

Номер: US20210210922A1
Автор: Da-xin CHEN, Feng-Qing Zhou, Gui-jun JI, Hai-feng LV, Zhong-Sheng Wang
Принадлежит: MOLEX LLC

An optical module includes an optical fiber component, a wavelength division multiplexing (WDM) filter, at least one isolator, a mirror and an optical detecting component. The optical fiber component, the WDM filter, the at least one isolator, the mirror and the optical detecting component are configured to prevent a signal light which is before an EDF component and an amplified signal light after the EDF component from counter transmission with a simplified structure and compact size.

Подробнее
Номер записи: 90
09-07-2015 дата публикации

OPTIC FIBER AMPLIFIER HAVING A HIGH BRILLOUIN THRESHOLD AND METHOD FOR MAKING SUCH AN AMPLIFIER

Номер: US20150194787A1
Автор: Canat Guillaume, Fleury Didier, Le Gouët Julien, Lombard Laurent
Принадлежит: Office National d'Etudes et de Recherches Aérospatiales-ONERA

According to one aspect, the invention relates to an optic fiber amplifier having a high Brillouin threshold, and including: an amplification optic fiber () comprising a core and a sheath and suitable for amplifying a signal beam travelling in said core; means for coupling the signal beam in an input end of said amplification optic fiber; means for coupling a pump laser beam for pumping said amplification optic fiber; a structure () including a deformable portion around which at least one portion of said amplification optic fiber is wound in the shape of turns, said turns being in contact with a surface of said deformable portion, wherein the friction of said optic fiber on said surface resulting, during the deformation of said deformable portion, in an elongation of said amplification optic fiber according to an elongation profile that varies from one turn to the other. 1. An optical fiber amplifier with high Brillouin threshold comprising:an amplifying optical fiber comprising a core and a cladding, which is suitable for the amplification of a signal beam propagating in said core;a first coupling device for coupling a signal beam in an input end of said amplifying optical fiber,a second coupling device for coupling a laser pump beam for the pumping of said amplifying optical fiber,a structure comprising a deformable part around which at least one part of said amplifying optical fiber is wound in the form of coils, said coils being in contact with a surface of said deformable part, the rubbing of said optical fiber on said surface causing during the deformation of said deformable part an elongation of said amplifying optical fiber according to an elongation profile varying from one coil to the next.2. The optical fiber amplifier as claimed in claim 1 , wherein said amplifying optical fiber is fixed to said structure at a given number of fixing points claim 1 , the elongation of the amplifying optical fiber at said fixing points being less than 0.3%.3. The optical ...

Подробнее
Номер записи: 91
29-06-2017 дата публикации

Compact hybrid laser rod and laser system

Номер: US20170187159A1
Автор: Diego F. Pierrottet, Farzin Amzajerdian, George E. Busch
Принадлежит: National Aeronautics and Space Administration NASA

A hybrid fiber rod includes a fiber core and inner and outer cladding layers. The core is doped with an active element. The inner cladding layer surrounds the core, and has a refractive index substantially equal to that of the core. The outer cladding layer surrounds the inner cladding layer, and has a refractive index less than that of the core and inner cladding layer. The core length is about 30 to 2000 times the core diameter. A hybrid fiber rod laser system includes an oscillator laser, modulating device, the rod, and pump laser diode(s) energizing the rod from opposite ends. The rod acts as a waveguide for pump radiation but allows for free-space propagation of laser radiation. The rod may be used in a laser resonator. The core length is less than about twice the Rayleigh range. Degradation from single-mode to multi-mode beam propagation is thus avoided.

Подробнее
Номер записи: 92
04-06-2020 дата публикации

LASER OSCILLATOR WITH DISPERSED INSTALLATION ROUTE OF OPTICAL FIBER

Номер: US20200176944A1
Автор: INOUE Tomohiro
Принадлежит: FANUC Corporation

Provided is a laser oscillator including: in a single housing, a first optical fiber extending from an excitation light source module; a second optical fiber extending from a resonator; and a first plate on which a connection point between the first optical fiber and the second optical fiber is disposed, the first optical fiber and the second optical fiber extending toward the connection point from one side and another side of the first plate, respectively. 1. A laser oscillator having an excitation light source module and a resonator in a single housing , the laser oscillator comprising:a first optical fiber extending from the excitation light source module;a second optical fiber extending from the resonator; anda first plate on which a connection point between the first optical fiber and the second optical fiber is disposed,wherein the first optical fiber and the second optical fiber extending toward the connection point from one side and another side of the first plate, respectively.2. The laser oscillator of claim 1 , whereinall connection points between optical fibers in the housing are disposed at a position visible from a maintenance side.3. The laser oscillator of claim 2 , further comprising:a second plate on which the excitation light source module and the resonator are disposed,wherein the first plate and the second plate are disposed in a two-layer structure.4. The laser oscillator of claim 3 , whereinthe excitation light source module and the resonator are disposed on a front surface and a back surface of the second plate, respectively.5. The laser oscillator of claim 3 , further comprising:a cooling device configured to cool the second plate.6. The laser oscillator of claim 3 , whereinthe first plate is disposed closer to the maintenance side than the second plate, andthe first plate has a surface area less than a surface area of the second plate.7. The laser oscillator of claim 3 , whereinthe first plate is disposed closer to the maintenance side than ...

Подробнее
Номер записи: 93
15-07-2021 дата публикации

LASER GAIN OPTICAL FIBER HEAT-DISSIPATING DEVICE

Номер: US20210218216A1
Автор: Hu Mengyun, XU Shuai, ZENG Heping, ZHANG Qingshan
Принадлежит:

The present disclosure relates to a gain optical fiber heat-dissipating device for high power ultra-fast laser, including a gain optical fiber and a heat-dissipating structure. The heat-dissipating structure includes a metal tube, a flexible heat-conducting layer and a water-cooling structure. The gain optical fiber is passed through the metal tube, and the flexible heat-conducting layer is provided between the metal tube and the gain optical fiber. The water-cooling structure is provided on the metal tube to reduce temperature of the gain optical fiber. The gain optical fiber heat-dissipating device according to the present disclosure can dissipate the heat through a water-cooling mode, and realize rapid heat dissipation, thus improving heat-dissipating efficiency. 1. A gain optical fiber heat-dissipating device , comprising:a gain optical fiber; and a metal tube, the gain optical fiber being passed through the metal tube,', 'a flexible heat-conducting layer provided between the metal tube and the gain optical fiber, and', 'a water-cooling structure provided on the metal tube to reduce temperature of the gain optical fiber., 'a heat-dissipating structure comprising2. The gain optical fiber heat-dissipating device according to claim 1 , wherein the water-cooling structure comprises a water-cooling end socket and a fiber optic terminal claim 1 , the fiber optic terminal is made of a metal material claim 1 , the water-cooling end socket has a sealing chamber configured to contain circulating cooling water and cool the fiber optic terminal claim 1 , the sealing chamber is provided with a first inlet and a first outlet;the fiber optic terminal is mounted on the water-cooling end socket and passed through the sealing chamber, at least one of two ends of the gain optical fiber is provided with the fiber optic terminal, two ends of the gain optical fiber extend to an outside of the metal tube;an end of the metal tube and an end of the gain optical fiber adjacent on an ...

Подробнее
Номер записи: 94
15-07-2021 дата публикации

OPTICAL TRANSMISSION MODULE, OPTICAL TRANSMISSION-RECEPTION MODULE AND OPTICAL MODULE

Номер: US20210218217A1
Автор: CHEN Jinlei, CUI Feng, FU Qinhao, Tang Yi, XIE Yifan, Yu Lin
Принадлежит: Hisense Broadband Multimedia Technologies Co., Ltd.

An optical transmission module includes a housing having a cavity therein and an optical transmission device encapsulated in the cavity. The optical transmission device includes an optical waveguide substrate, laser assemblies, an optical multiplexing assembly and main waveguides. The optical waveguide substrate includes a surface and a first reflection inclined surface having an acute angle therebetween. The laser assemblies are disposed on the surface of the optical waveguide substrate, and are configured to emit laser beams towards the surface of the optical waveguide substrate. The optical multiplexing assembly is disposed in the optical waveguide substrate, and is configured to combine the laser beams into a laser beam. The main waveguides are disposed inside the optical waveguide substrate, light inlet ends of the main waveguides face the first inclined surface, and light outlet ends of the main waveguides are communicated with the optical multiplexing assembly. 1. An optical transmission module , comprising:a housing having a cavity therein;a circuit board;an optical fiber adapter configured to fix an optical fiber; and an optical waveguide substrate, wherein the optical waveguide substrate includes a surface and a first reflection inclined surface connected to the surface, and an angle between the surface and the first reflection inclined surface is an acute angle;', 'a plurality of laser assemblies disposed on the surface of the optical waveguide substrate, the laser assemblies being configured to emit laser beams towards the surface of the optical waveguide substrate;', 'an optical multiplexing assembly disposed in the optical waveguide substrate, the optical multiplexing assembly being configured to combine the laser beams emitted by the plurality of laser assemblies into a laser beam; and', 'a plurality of main waveguides disposed inside the optical waveguide substrate, light inlet ends of the main waveguides facing the first reflection inclined surface, ...

Подробнее
Номер записи: 95
25-09-2014 дата публикации

LASER MODULE AND METHOD FOR MANUFACTURING SAME

Номер: US20140286363A1
Автор: KASAI Yohei
Принадлежит: FUJIKURA LTD.

A laser module includes: a bottom plate of a box; the frame member being fixed to the bottom plate; a pipe member including a hollow portion PH communicating with the through hole OP of a box, the pipe member being fixed to the outer wall of the frame member; an optical fiber held on the hollow portion PH of the pipe member; and a laser element accommodated in the internal space of the box, the optical axis of the laser element being aligned with the optical axis of the optical fiber. When the bottom plate is placed on a plane, the bottom face of the pipe member is on the same face as a bottom plate portion contacting the plane. 17-. (canceled)8. A laser module comprising:a bottom plate of a box;a frame member of the box including a through hole that communicates an internal space of the box with an external space, the frame member being fixed to the bottom plate;a pipe member including a hollow portion communicating with the through hole, the pipe member being joined to an outer wall of the frame member;an optical fiber held on the hollow portion of the pipe member; anda laser element accommodated in the internal space of the box, an optical axis of the laser element being aligned with an optical axis of the optical fiber,wherein when the bottom plate is placed on a plane, a bottom face of the pipe member is on a same face as a bottom plate portion contacting the plane.9. The laser module according to claim 8 , wherein a relationship is provided in which a value that a contact area between the pipe member and the plane is divided by a base area of the pipe member is greater than a value that a contact area between the bottom plate and the plane is divided by a base area of the bottom plate.10. The laser module according to claim 8 , wherein a state is provided in which a height of the pipe member is lower than a height of the frame member to which the pipe member is joined.11. The laser module according to claim 8 , wherein a state is provided in which a width of ...

Подробнее
Номер записи: 96
23-07-2015 дата публикации

High power parallel fiber arrays

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

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

Подробнее
Номер записи: 97
14-07-2016 дата публикации

SYSTEM AND METHOD FOR HIGH-POWER, PULSED RING FIBER OSCILLATOR

Номер: US20160204564A1
Автор: Brooks Christopher D., Di Teodoro Fabio, Royse Robert W., Savage-Leuchs Matthias P., Vatter Tracy W.
Принадлежит: LOCKHEED MARTIN CORPORATION

A ring laser includes a large-core rare-earth-doped fiber ring-connected with a free-space path having an electro-optic switch, output coupler, and intracavity band-pass filter to enforce lasing operation in narrow wavelength range. In some cavity-dumped modes, the laser is configured in a similar manner, except that an output coupler is omitted since the optical power is extracted from the laser cavity by the electro-optic switch itself. The same laser can be configured to operate in Q-switched and/or cavity-dumping modes as well as in hybrid modes (e.g., partial Q-switch, followed by cavity dumping, or even CW). In some embodiments, the laser can be used as, or inject laser light into, a regenerative solid-state amplifier, or a Raman laser, or can be also used to generate visible, ultra-violet, mid-infrared, and far-infrared (THz) radiation via nonlinear wavelength conversion processes. The various embodiments can use a power oscillator or seed-plus-amplifier MOPA configuration. 1. (canceled)2. The apparatus of claim 23 , further comprising:a rare-earth-doped optical-fiber power amplifier that is optically coupled to receive the first signal beam and that has a power-gain-fiber section configured to generate an amplified second signal beam; anda wavelength-conversion device optically coupled to receive the amplified second signal beam and configured to form a wavelength-converted output beam that has a second wavelength different from the first wavelength.3. (canceled)4. The apparatus of claim 23 , wherein the gain-fiber section of the first optical fiber includes a large-mode-area (LMA) gain-fiber section claim 23 , wherein the first optical fiber further includes a passive polarization-maintaining fiber section connected to an end of the LMA gain-fiber section.5. The apparatus of claim 2 , wherein the optical-fiber power amplifier includes a passive polarization-maintaining delivery fiber that couples the amplified output beam out of a second end of the power- ...

Подробнее
Номер записи: 98
22-07-2021 дата публикации

System-level optical amplifier efficiency performance metric

Номер: US20210226408A1
Автор: BOERTJES David W., Flannery Damian, Jones Kevan
Принадлежит:

Systems and methods for a system-level Erbium-Doped Fiber Amplifier (EDFA) optical amplifier efficiency metric. The efficiency metric is a single metric that summarizes optical amplifier behavior and has a predictable behavior over various different optical amplifier settings. Specifically, the efficiency metric is simple and elegant. The simplicity is based on the fact the efficiency metric is determined from available data in an optical amplifier, not requiring external monitoring equipment, dithering, etc. The elegance is based on the fact the efficiency metric covers different optical amplifier settings, multiple pumps, etc. and is shown to reflect degradation with these differences in real-world systems accurately. Specifically, the efficiency metric is designed to reflect health in a multiple pump optical amplifier, providing a single value that represents the total pump currents across all of the multiple pumps. 1. A non-transitory computer-readable medium having instructions stored thereon for programming a processor to perform steps of:obtaining data from an Erbium-Doped Fiber Amplifier (EDFA) optical amplifier having a plurality of pumps, wherein the data includes a representative optical power in the EDFA optical amplifier and a pump metric representative of a state of the plurality of pumps;determining an efficiency metric based on the representative optical power and the pump metric representative of the state of the plurality of pumps;determining a degradation in operation of the EDFA optical amplifier based on the efficiency metric; andcausing one or more actions based on a determination of the degradation.2. The non-transitory computer-readable medium of claim 1 , wherein the instructions stored thereon further program the processor to perform steps ofdetermining the degradation based on one of i) the efficiency metric reaching a threshold and ii) values of the efficiency metric over time having a negative trend.3. The non-transitory computer- ...

Подробнее
Номер записи: 99
12-07-2018 дата публикации

Tandem pumped fiber laser or fiber amplifier

Номер: US20180198251A1
Автор: Manoj Kanskar
Принадлежит: NLight Inc

In an example, an apparatus to tandem pump a fiber laser or fiber amplifier may include a combiner; a power amplifier or a power oscillator, or a combination thereof, coupled to an output of the combiner; a seed laser to output light to the power amplifier or the power oscillator, or the combination thereof, via the combiner; and a tandem pump to generate light of a pump source signal, wherein the light of the pump source signal is output to the combiner to cladding pump the power amplifier or the power oscillator, or the combination thereof. Other embodiments may be disclosed and/or claimed.

Подробнее
Номер записи: 100