公开(公告)号：US10084279B2

公开(公告)日：2018-09-25

申请号：US15827207

申请日：2017-11-30

Applicant: CSIR

Inventor： Ihar Anatolievich Litvin ,  Gary Rees King

IPC: H01S3/00 ,  H01S3/094 ,  H01S3/102 ,  H01S3/0941

CPC classification number: H01S3/0071 ,  H01S3/094049 ,  H01S3/094061 ,  H01S3/09408 ,  H01S3/094096 ,  H01S3/09415 ,  H01S3/102 ,  H01S3/1022

Abstract: A laser apparatus has a gain medium which has opposite ends, wherein the laser apparatus includes at least two independently controllable excitation sources, each one of the excitation sources being operable to produce an input beam to excite or pump the gain medium. Beam splitting arrangements are associated with the excitation sources are configured to split the input beam of its associated excitation source into at least two sub-beams. Beam guiding arrangements are associated with the excitation sources and are configured to direct a path of at least one of the split sub-beams from its associated excitation source, whereby each excitation source, its associated beam splitting arrangement, and beam guiding arrangement are arranged such that the sub-beams are respectively directed inwardly towards the gain medium at opposite ends.

公开(公告)号：US09941656B2

公开(公告)日：2018-04-10

申请号：US14995300

申请日：2016-01-14

Applicant: OFS Fitel, LLC

Inventor： David J DiGiovanni

IPC: G02B6/24 ,  H01S3/094 ,  C03B37/012 ,  G02B6/024 ,  G02B6/036 ,  H01S3/067 ,  G02B6/028 ,  H01S3/0941 ,  G02B6/255

CPC classification number: H01S3/094007 ,  C03B37/01217 ,  C03B2203/22 ,  C03B2203/31 ,  G02B6/024 ,  G02B6/0285 ,  G02B6/03616 ,  G02B6/03622 ,  G02B6/03627 ,  G02B6/03633 ,  G02B6/255 ,  H01S3/06712 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/094053 ,  H01S3/09408 ,  H01S3/0941 ,  H01S3/09415

Abstract: A double-clad (DC) polarization-maintaining (PM) optical fiber comprises a core, an inner cladding, an outer cladding, and stress rods. The core has a core refractive index (ncore). The inner cladding is located radially exterior to the core and has an inner cladding refractive index (n1), which is less than ncore. The stress rods are located in the inner cladding, and each stress rod has a stress rod refractive index (n2), which is substantially matched to n1. The outer cladding is located radially exterior to the inner cladding. The outer cladding has an outer cladding refractive index (nout), which is less than n1.

公开(公告)号：US20180069370A1

公开(公告)日：2018-03-08

申请号：US15257895

申请日：2016-09-06

Applicant: Tyco Electronics Subsea Communications LLC

Inventor： Yu Sun ,  Oleg Sinkin ,  Maxim A. Bolshtyansky ,  Alexei N. Pilipetskii ,  Dmitri Foursa

IPC: H01S3/23 ,  H04J14/02 ,  H04B10/516 ,  H01S3/094

CPC classification number: H01S3/2316 ,  H01S3/094049 ,  H01S3/09408 ,  H04B10/2581 ,  H04B10/2972 ,  H04B10/516 ,  H04J14/02 ,  H04J14/04

Abstract: Optical amplifier assembly for spatial division multiplexing (SDM) optical communication systems. Each optical amplifier assembly includes a single pump assembly configured for causing amplification of signals traveling on separate fiber paths in different directions. Each fiber path includes a plurality of spatial dimensions. The single pump assembly includes a plurality of pump sources to provide redundancy and the optical amplifier assembly further includes splitters for splitting outputs of the pump sources to amplifiers coupled to the different spatial dimensions. Different modulation formats may be used on the different spatial dimensions with different pump power being provided to each of the modulation formats. Amplifiers with complementary outputs may be coupled to average out gain deviations.

公开(公告)号：US09871338B2

公开(公告)日：2018-01-16

申请号：US15397719

申请日：2017-01-03

Applicant: NLIGHT, INC.

Inventor： Raymond Kirk Price

IPC: G02B6/28 ,  H01S3/094 ,  H01S3/067 ,  H01S3/16

CPC classification number: H01S3/094053 ,  G02B6/2835 ,  H01S3/06733 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/094011 ,  H01S3/09408 ,  H01S3/09415 ,  H01S3/1603

Abstract: Disclosed herein is a fiber pump combiner, comprising, a multi-clad fiber comprising an outer cladding layer and an inner cladding layer, a plurality of tapered trenches formed in the inner cladding layer and a plurality of pump fibers, wherein the plurality of pump fibers are tapered and fused into corresponding ones of the plurality of tapered trenches.

公开(公告)号：US09847616B1

公开(公告)日：2017-12-19

申请号：US14997757

申请日：2016-01-18

Applicant: Rofin-Sinar UK Ltd

Inventor： Howard John Baker ,  Jason Robert Lee ,  Benjamin Stuart Fulford ,  David James Lewis Birkin

IPC: H01S3/00 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/16 ,  G02B19/00 ,  G02B27/09

CPC classification number: H01S3/094049 ,  G02B19/0009 ,  G02B19/0057 ,  G02B27/0961 ,  H01S3/0606 ,  H01S3/09408 ,  H01S3/0941 ,  H01S3/163 ,  H01S3/1685 ,  H01S3/2308 ,  H01S5/005 ,  H01S5/4012 ,  H01S5/4031

Abstract: Apparatus and method for the amplification of a laser beam by pumping a homogenous composite source beam through an amplification medium. A slab crystalline active medium is side-pumped via a pump module having a laser diode bar and an optical assembly. The optical assembly has a fast axis collimator and a lens in the fast axis and an array of slow axis collimators and the lens in the slow axis. The lenses are spaced so that the individual source beams from the emitters are: imaged upon a first facet of the amplification medium; have a beam waist at or near the first facet; are sized to fill the first facet; substantially overlap on the first facet; and are directed so that peripheral source beams undergo total internal reflection on entering the amplification medium. Embodiments of multiple laser diode bars and optical assemblies are described together with double side pumping arrangements.

公开(公告)号：US09837783B2

公开(公告)日：2017-12-05

申请号：US15004680

申请日：2016-01-22

Applicant: nLIGHT Photonics Corporation

Inventor： Dahv A. V. Kliner ,  Roger L. Farrow

IPC: H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/094

CPC classification number: H01S3/06729 ,  H01S3/06733 ,  H01S3/0675 ,  H01S3/08045 ,  H01S3/094007 ,  H01S3/09408

Abstract: An optical apparatus includes one or more pump sources situated to provide laser pump light, and a gain fiber optically coupled to the one or more pump sources, the gain fiber including an actively doped core situated to produce an output beam, an inner cladding and outer cladding surrounding the doped core and situated to propagate pump light, and a polymer cladding surrounding the outer cladding and situated to guide a selected portion of the pump light coupled into the inner and outer claddings of the gain fiber. Methods of pumping a fiber sources include generating pump light from one or more pump sources, coupling the pump light into a glass inner cladding and a glass outer cladding of a gain fiber of the fiber source such that a portion of the pump light is guided by a polymer cladding surrounding the glass outer cladding, and generating a single-mode output beam from the gain fiber.

公开(公告)号：US20170117682A1

公开(公告)日：2017-04-27

申请号：US14453318

申请日：2014-08-06

Applicant: The Boeing Company

Inventor： Vytas T. Gylys ,  Andrea Koumvakalis ,  Gregory A. Needham ,  Dale A. Holmes

IPC: H01S3/13 ,  H01S3/0941 ,  H01S3/06 ,  H01S3/16 ,  H01S3/08 ,  H01S3/081

CPC classification number: H01S3/1305 ,  H01S3/0014 ,  H01S3/0604 ,  H01S3/0606 ,  H01S3/07 ,  H01S3/08059 ,  H01S3/08081 ,  H01S3/08095 ,  H01S3/0813 ,  H01S3/09408 ,  H01S3/0941 ,  H01S3/1312 ,  H01S3/139 ,  H01S3/1618 ,  H01S3/1643

Abstract: A device includes a first sensor configured to generate a first output signal corresponding to an energy of a portion of a forward beam transmitted by a mirror of a laser resonator system. The device further includes a second sensor configured to generate a second output signal corresponding to an energy of a portion of a return beam transmitted by the mirror. A ratio of the energy of the portion of the forward beam and the energy of the portion of the return beam corresponds to a measurement of a feedback ratio of the laser resonator system.

公开(公告)号：US20160359288A1

公开(公告)日：2016-12-08

申请号：US15240442

申请日：2016-08-18

Applicant: FUJIKURA LTD.

Inventor： Yuji Matsuoka

IPC: H01S3/00 ,  G01J1/44 ,  H01S3/23 ,  G02B6/28 ,  H01S3/067 ,  G01J1/42 ,  G02B6/42

CPC classification number: H01S3/0014 ,  G01J1/4257 ,  G01J1/44 ,  G02B6/2804 ,  G02B6/4286 ,  H01S3/067 ,  H01S3/0675 ,  H01S3/094011 ,  H01S3/09408 ,  H01S3/1305 ,  H01S3/2383

Abstract: To provide a fiber laser apparatus capable of detecting a failure of an optical fiber within a wide range of the apparatus with an inexpensive configuration. The fiber laser apparatus 100 has a plurality of fiber laser units 110, a combiner 120 operable to optically combine output laser beams outputted from the fiber laser unit 110 to generate a combined laser beam, a laser emission portion 130 operable to emit the combined laser beam, output laser beam power detection parts 170 operable to detect a power of an output laser beam of each of the fiber laser units 110, a combined laser beam power detection part 140 operable to detect a power of the combined laser beam, and a failure detection part 160 operable to compare the total of detected powers of the output laser beams (total laser beam power) with the detected power of the combined laser beam and determine that a failure has occurred in the fiber laser unit 110 when a ratio of the power of the combined laser beam to the total laser beam power becomes lower than a predetermined threshold T.

Abstract translation: 提供一种光纤激光装置，其能够以廉价的结构检测该装置的宽范围内的光纤的故障。 光纤激光装置100具有多个光纤激光器单元110，组合器120可操作以光学地组合从光纤激光单元110输出的输出激光束以产生组合的激光束;激光发射部分130，其可操作地发射组合的激光束 输出激光束功率检测部分170，其可操作以检测每个光纤激光器单元110的输出激光束的功率;组合激光束功率检测部分140，其可操作以检测组合的激光束的功率;以及故障检测 部分160可操作以将输出激光束的检测功率（总激光束功率）的总和与组合的激光束的检测功率进行比较，并且确定当光纤激光单元110的功率的比率 组合的激光束相对于总激光束功率变得低于预定阈值T.

公开(公告)号：US09496676B2

公开(公告)日：2016-11-15

申请号：US14776030

申请日：2014-03-11

Applicant: NEC Corporation

Inventor： Motoyoshi Kawai

IPC: H01S3/13 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/067

CPC classification number: H01S3/1301 ,  H01S3/06754 ,  H01S3/094061 ,  H01S3/09408 ,  H01S3/094096 ,  H01S3/09415 ,  H01S5/4018

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

Abstract translation: [问题]在光放大器中，激发激光二极管的激发光电平降低，或者当激发光的输出停止时，备用激发激光二极管工作，因此电流消耗增加。 [解决方案]该光放大器设置有多个激发激光二极管，第一电流控制元件，第二电流控制元件和控制装置。 激发激光二极管振荡激发光，激发光被输入到光纤放大器。 第一电流控制元件控制在激发激光二极管中流动的电流。 第二电流控制元件控制在至少一个激励激光二极管中流动的电流。 控制装置控制第一电流控制元件和第二电流控制元件。

公开(公告)号：US09484705B2

公开(公告)日：2016-11-01

申请号：US14440643

申请日：2013-11-07

Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V. ,  RWTH AACHEN

Inventor： Peter Russbueldt ,  Guido Rotarius ,  Thomas Sartorius ,  Johannes Weitenberg

IPC: H01S3/06 ,  H01S3/08 ,  H01S3/094 ,  H01S3/16 ,  H01S3/0941

CPC classification number: H01S3/0604 ,  H01S3/0606 ,  H01S3/0625 ,  H01S3/08059 ,  H01S3/08081 ,  H01S3/08095 ,  H01S3/09408 ,  H01S3/094084 ,  H01S3/094096 ,  H01S3/09415 ,  H01S3/1618 ,  H01S3/1643 ,  H01S2301/02

Abstract: An optically end-pumped amplifier with a plate-shaped optical gain medium has a plurality of pump laser units for optically pumping the gain medium through at least one of the narrow side surfaces thereof. The pump laser units are designed such that the pump laser radiation, upon passing through the gain medium, has an elongated beam cross section having a short axis and a long axis running parallel to the main surfaces of the gain medium and propagates freely through the gain medium with respect to the short axis. They are arranged such that in each case the principal axes of the beam bundles of the pump laser units impinge on one of the pumped side surfaces in a plane perpendicular to the short axis at an angle to one another, wherein the beam cross sections of the beam bundles are superimposed on one another.

Abstract translation: 具有板状光学增益介质的光学端部泵浦放大器具有多个泵浦激光器单元，用于通过其增益介质中的至少一个窄侧面光学泵浦增益介质。 泵浦激光器单元被设计成使得泵浦激光辐射在通过增益介质时具有细长的横截面，其具有短轴和平行于增益介质的主表面延伸的长轴，并且通过增益自由地传播 介质相对于短轴。 它们被布置成使得在每种情况下，泵激光单元的束束的主轴在垂直于短轴的平面中的一个泵浦侧表面上彼此成角度地撞击，其中梁的横截面 束束彼此重叠。