Optical Fiber Laser Patents (Class 372/6)
  • Patent number: 11502476
    Abstract: A laser oscillator includes a first structure disposed with an optical section, a second structure disposed with a power source section, and an electric cable that electrically connects the optical section and the power source section. The first structure is removably coupled to the second structure, the electric cable is removably connected to at least one of the power source section and the optical section, and the optical section is allowed to be replaced.
    Type: Grant
    Filed: October 23, 2020
    Date of Patent: November 15, 2022
    Assignee: Fanuc Corporation
    Inventors: Masahiro Honda, Yuuta Sugimachi
  • Patent number: 11493605
    Abstract: Provided are a depth information camera module and a base assembly, a projection assembly, an electronic device and a manufacturing method thereof. The depth information camera module includes: a projection assembly to project a laser to a to-be-detected object; a receiving assembly, including a photosensitive element for receiving the laser reflected from the to-be-detected object; and a base assembly, the base assembly including a circuit board and a base body, the base body being supported by the circuit board, where the photosensitive element is electrically connected to the circuit board, the projection assembly circuit board is supported on a top side of the base body such that the circuit board and the projection assembly circuit board are respectively at different heights of the base assembly. Here, the projection assembly has an integral structure to facilitate assembly of the projection assembly.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: November 8, 2022
    Assignee: NINGBO SUNNY OPOTECH CO., LTD.
    Inventors: Feifan Chen, Zhongwei Wang, Qi Rong, Junjie Zeng, Hangang Wei, Beibei Dai, Minjie Pan
  • Patent number: 11482834
    Abstract: A laser system produces pulses having wavelengths between 2000 nm and 2100 nm, peak output powers greater than 1 kW, average powers greater than 10 W, pulse widths variable from 0.5 to 10 nsec, pulse repetition frequencies variable from 0.1 to over 2 MHz, and a pulse extinction of at least 60 dB. Pulses from a diode laser having a wavelength between 1000 nm and 1100 nm are amplified by at least one fiberoptic amplifier and applied as the pump input to an Optical Parametric Amplifier (OPA). A cw laser provides an OPA seed input at a wavelength between 2000 nm and 2200 nm. The idler output of the OPA having difference frequency wavelength between 2000 nm and 2100 nm is further amplified by a crystal amplifier. The fiberoptic amplifier can include Ytterbium-doped fiberoptic. The crystal amplifier can include a Ho:YAG, Ho:YLF, Ho:LuAG, and/or a Ho:Lu2O3 crystal.
    Type: Grant
    Filed: March 31, 2021
    Date of Patent: October 25, 2022
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Leonard A. Pomeranz, Scott D. Setzler, Jojit C. Torcedo
  • Patent number: 11473982
    Abstract: Disclosed herein is a method for measuring temperature via distributed temperature sensing comprising transmitting light through a fiber optic cable; detecting backscattered light in the fiber optic cable, wherein the backscattered light comprises an anti-Stokes band and a Stokes band; calculating a ratio between an intensity of the anti-Stokes band and an intensity of the Stokes band; and using the calculated ratio to determine a temperature being sensed in the fiber optic cable; wherein the fiber optic cable comprises, from the center to the periphery; a central core having a refractive index that decreases progressively from a center of the central core to an edge of the core, wherein the refractive index follows an alpha profile; wherein a bandwidth-length product of the multimode optical fiber has a value greater than 2000 MHz-km at 1550 nm.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: October 18, 2022
    Assignee: OFS FITEL, LLC
    Inventors: David D Braganza, Jie Li, Xiaoguang Sun
  • Patent number: 11467266
    Abstract: In one embodiment, a lidar system includes a light source configured to emit local-oscillator light and pulses of light, where each emitted pulse of light is (i) coherent with a corresponding portion of the local-oscillator light and (ii) includes a spectral signature of one or more different spectral signatures. The lidar system also includes a receiver configured to detect the local-oscillator light and a received pulse of light, the received pulse of light including light from one of the emitted pulses of light scattered by a target located a distance from the lidar system, the one of the emitted pulses of light including a particular spectral signature of the one or more spectral signatures. The local-oscillator light and the received pulse of light are coherently mixed together at the receiver. The receiver includes one or more detectors and a frequency-detection circuit.
    Type: Grant
    Filed: June 26, 2020
    Date of Patent: October 11, 2022
    Assignee: Luminar, LLC
    Inventors: Joseph G. LaChapelle, Jason M. Eichenholz, Alex Michael Sincore
  • Patent number: 11460554
    Abstract: A method for expanding a dynamic range of a light detection and ranging (LiDAR) system is provided. The method comprises transmitting, using a light source of the LiDAR system, a sequence of pulse signals consisting of two or more increasingly stronger pulse signals. The method further comprises receiving, using a light detector of the LiDAR system, one or more returned pulse signals corresponding to the transmitted sequence of pulse signals. The one or more returned pulse signals are above the noise level of the light detector. The method further comprises selecting a returned pulse signal within the dynamic range of the light detector, identifying a transmitted pulse signal of the transmitted sequence that corresponds to the selected returned pulse signal, and calculating a distance based on the selected returned signal and the identified transmitted signal.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: October 4, 2022
    Assignee: INNOVUSION, INC.
    Inventors: Rui Zhang, Yimin Li, Junwei Bao
  • Patent number: 11422307
    Abstract: A cladding mode stripper, includes: a resin part that covers a coating-removed section of an optical fiber and has a refractive index not less than that of an outermost shell of the optical fiber in the coating-removed section. A surface of the resin part includes an incident angle reducing structure. The surface is opposite to an interface between the resin part and the outermost shell. The incident angle reducing structure reduces a first incident angle or a first average incident angle at which cladding mode light that has entered the resin part from the optical fiber enters the surface.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: August 23, 2022
    Assignee: Fujikura Ltd.
    Inventor: Ryokichi Matsumoto
  • Patent number: 11411367
    Abstract: Multi-stage fiber amplifiers can amplify signals from a few Watts to several kilowatts. These amplifiers are limited in power by intensity instabilities resulting from a sequence of nonlinear optical effects. These nonlinear optical effects include stimulated Brillouin scattering (SBS), with produces a high-intensity pulse close to the signal wavelength that propagates backward up the amplifier chain, causing permanent damage to the upstream components. This SBS pulse can be blocked by an optical isolator that blocks backward-propagating light at or near the signal wavelength. At high enough power levels, the SBS pulse can also induce backward-propagating light at wavelengths tens to hundreds of nanometers away from the signal wavelength. This SBS-Pulse Induced Non-linear Spectrum light is outside the isolator's reject band, so it can propagate upstream and de-stabilize the upstream amplifier stages.
    Type: Grant
    Filed: March 23, 2020
    Date of Patent: August 9, 2022
    Assignee: Massachusetts Institute of Technology
    Inventors: Andrew Benedick, Kevin Creedon, John J. Zayhowski
  • Patent number: 11387622
    Abstract: A fiber laser system based in solitonic passive mode-locking, including a laser diode to emit and deliver an optical signal of a first wavelength; a single-fiber laser cavity including a dichroic mirror, a SESAM and a polarization maintaining highly-doped active fiber, to receive the emitted signal and to emit a pulsed optical signal of a second wavelength, generating laser light in the form of mode-locked ultrashort pulses; a unit coupling the laser diode to the single-fiber laser cavity; and an isolator device protecting the cavity from back reflections. The solitonic mode-locked ultrashort pulses are comprised in a range of 100 fs<10 ps with repetition rates of hundreds MHz to tens of GHz.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: July 12, 2022
    Assignee: FYLA LASER, S. L.
    Inventors: Pere Pérez Millán, Javier Abreu Afonso, Salvador Torres Peiró, Viorel Otgon, Héctor Muñoz Marco
  • Patent number: 11307350
    Abstract: The single mode optical fiber disclosed herein has a core, an inner cladding, a trench and an outer cladding, along with a non-glass protective coating. The refractive index profile of the optical fiber is such that the optical fiber has relatively low bend loss at both small and large bend diameters. The relative refractive indices of the inner cladding, trench and outer cladding are such that a tunneling point that arises during bending is pushed out beyond the trench and thus sufficiently far away from the core so that bending losses for both small and large radius bends are relatively small.
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: April 19, 2022
    Assignee: Corning Incorporated
    Inventors: Ming-Jun Li, Snigdharaj Kumar Mishra, Pushkar Tandon
  • Patent number: 11303091
    Abstract: A pulsed light generation device, includes: a first optical fiber through which first pulsed light and second pulsed light, having an intensity that decreases while an intensity of the first pulsed light increases, and increases while the intensity of the first pulsed light decreases, having been multiplexed and entered therein, are propagated; and a second optical fiber at which the first pulsed light, having exited the first optical fiber and entered therein, is amplified while being propagated therein, wherein: at the first optical fiber, phase modulation occurs in the first pulsed light due to cross phase modulation caused by the second pulsed light; and self-phase modulation occurring in the first pulsed light at the second optical fiber is diminished by the phase modulation having occurred at the first optical fiber.
    Type: Grant
    Filed: January 3, 2020
    Date of Patent: April 12, 2022
    Assignee: NIKON CORPORATION
    Inventor: Akira Tokuhisa
  • Patent number: 11276982
    Abstract: A doped fiber amplifier is proposed that includes both a Ho-doped amplifier (used as a preamplifier) and a Tm-doped amplifier (used as a power amplifier). The Ho-doped preamplifier typically uses a single clad (SC) optical fiber as the gain element, with both the propagating signal and pump beam introduced into the Ho-doped core of the SC fiber. The Tm-doped power amplifier typically utilizes a double clad (DC) optical fiber as the gain element, which allows for a multimode pump to propagate within the Tm-doped core region and inner cladding, providing efficient high power amplification of the signal received at its input.
    Type: Grant
    Filed: January 22, 2020
    Date of Patent: March 15, 2022
    Assignee: Cybel, LLC.
    Inventors: Jean-Marc Delavaux, Robert E. Tench, Clement Romano
  • Patent number: 11217961
    Abstract: Embodiments relate to a noise suppressor for suppressing noise of an optical signal, including a core through which the optical signal travels, a clad that is wrapped around the core and configured to expose part of the core, and a graphene layer formed on the part of the core, and a digital optical signal generation system including the same.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: January 4, 2022
    Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Yong-Won Song, Sungjae Lee
  • Patent number: 11217958
    Abstract: A semiconductor laser diode light source package includes: a seed light source for outputting signal beams; a pump beam source for outputting pump beams; and at least one mirror for transmitting the signal beams to a core of an output optical fiber and transmitting the pump beams to first cladding of the output optical fiber, wherein the seed light source, the pump beam source, and the at least one mirror are realized in a semiconductor chip, and the output optical fiber is connected to an end terminal of the semiconductor laser diode light source package.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: January 4, 2022
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hong-Seok Seo, Bongki Mheen, Gyu Dong Choi
  • Patent number: 11183812
    Abstract: A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. The short cavity laser has a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation, and includes embodiments for fast and wide tuning, and optimized spectral shaping. Disclosed are both electrical and optical pumping in a MEMS-VCSEL geometry with mirror and gain regions optimized for wide tuning, high output power, and a variety of preferred wavelength ranges; and a semiconductor optical amplifier, combined with the short-cavity laser to produce high-power, spectrally shaped operation. Several preferred imaging and detection systems make use of this tunable source for optimized operation are also disclosed.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: November 23, 2021
    Assignees: Thorlabs, Inc., Praevium Research, Inc.
    Inventors: Alex Ezra Cable, Vijaysekhar Jayaraman, Benjamin Michael Potsaid
  • Patent number: 11158990
    Abstract: The present disclosure relates to optical fiber amplifying systems having operability at a wide variety of ambient temperatures and to methods for using them. One aspect of the disclosure is an optical fiber system configured to provide amplified radiation. The system includes an active optical fiber; a plurality of grating-locked pump sources, each having an output optically coupled to the active optical fiber; one or more temperature sensors, configured to measure a temperature associated with one or more of the grating-locked pump sources; and a control system configured to accept measurements from the one or more temperature sensors and, for a desired total pump power output, to provide to one or more of the grating-locked pump sources a set of drive currents suitable to provide the desired total pump power output.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: October 26, 2021
    Assignee: Nufern
    Inventor: Daniel J. Creeden
  • Patent number: 11156848
    Abstract: In various embodiments, optical repositioners and/or angled dispersive elements are utilized to manipulate portions of an input laser beam emitted by a group of laser emitters in order to form a multi-wavelength output beam having a high beam quality factor.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: October 26, 2021
    Assignee: TERADIODE, INC.
    Inventors: Parviz Tayebati, Wang-Long Zhou, Bien Chann, Robin Huang, Michael Cruz
  • Patent number: 11126018
    Abstract: Embodiments include apparatuses, methods, and systems including a dynamic polarization controller (DPC) to receive a first light beam and a second light beam, to adjust a rotation of a state of polarization (SOP) of the first light beam and the second light beam to generate a third light beam and a fourth light beam, under the control of a first control signal, a second control signal, and a third control signal. The first control signal may be related to a phase difference between the third light beam and the fourth light beam, the second control signal may be related to an intensity difference between the third light beam and the fourth light beam, and the third control signal may be related to a rotation of a SOP of the third light beam and the fourth light beam. Other embodiments may also be described and claimed.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: September 21, 2021
    Assignee: INTEL CORPORATION
    Inventors: Taehwan Kim, Ganesh Balamurugan, Hao Li, Hasitha Jayatilleka
  • Patent number: 11112614
    Abstract: A light-emitting device improves the beam quality of emission light from a single emitter light source in the slow-axis direction, and includes a light source 10 having a single emitter and a beam shaping module that splits the emission light from the light source into to a plurality of split-lights in the slow-axis direction, and shapes the split-lights as a shaped-beam arrayed in the fast-axis direction, and outputs the shaped-beam.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: September 7, 2021
    Assignee: SHIMADZU CORPORATION
    Inventors: Akiyuki Kadoya, Ichiro Fukushi, Koji Tojo
  • Patent number: 11106046
    Abstract: Beam combining optical systems include a fiber beam combiner having multiple inputs to which output fibers of laser diode sources are spliced. Cladding light stripping regions are situated at the splices, and include exposed portions of fiber claddings that are at least partially encapsulated with an optical adhesive or a polymer. A beam combiner fiber that is optically downstream of a laser source has an exposed cladding secured to a thermally conductive support with a polymer or other material that is index matched to the exposed cladding. This construction permits attenuation of cladding light propagating toward a beam combiner from a splice.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: August 31, 2021
    Assignee: nLIGHT, Inc.
    Inventors: Chris A. Rivera, Dahv A. V. Kliner, Joseph Emery
  • Patent number: 11067872
    Abstract: A doubly resonant optical parametric oscillator (1) includes a fan-out crystal (5, 55, 105) having an optical non-linearity of order 2 and placed in an optical cavity (6) able to reflect a pump (2). The crystal (5, 55, 105) has an entrance face (59) and an exit face (60), through which faces the optical axis passes, an upper face (57) and a lower face (58).
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: July 20, 2021
    Assignee: BLUE INDUSTRY AND SCIENCE
    Inventors: Johann Georges Des Aulnois, Benjamin Szymanski
  • Patent number: 11048042
    Abstract: A photonic integrated circuit may include a substrate and an optical waveguide integrated with the substrate. The optical waveguide may include a bend section, wherein a bend shape of the bend section is defined by a curvature function to suppress waveguide mode conversion.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: June 29, 2021
    Assignee: Lumentum Operations LLC
    Inventors: Shibnath Pathak, Konstantin Petrovich Petrov, Brian Daniel, Hossein Hodaei, Michael C. Larson, Amit Mizrahi
  • Patent number: 11043786
    Abstract: Aspects of the present disclosure describe systems, methods, and structures that advantageously amplify optical signals through the effect of optical pump signals generated by a multicore laser diode and multicore rare-earth doped optical fiber in optical communication with a 3D waveguide structure and a multicore input signal fiber providing a plurality of optical signals for amplification.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: June 22, 2021
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Kohei Nakamura, Yoshihisa Inada, Takanori Inoue
  • Patent number: 11043785
    Abstract: Methods for synthesizing fibers having nanoparticles therein are provided, as well as preforms and fibers incorporating nanoparticles. The nanoparticles may include one or more rare earth ions selected based on fluorescence at eye-safer wavelengths, surrounded by a low-phonon energy host. Nanoparticles that are not doped with rare earth ions may also be included as a co-dopant to help increase solubility of nanoparticles doped with rare earth ions in the silica matrix. The nanoparticles may be incorporated into a preform, which is then drawn to form fiber. The fibers may beneficially be incorporated into lasers and amplifiers that operate at eye safer wavelengths. Lasers and amplifiers incorporating the fibers may also beneficially exhibit reduced Stimulated Brillouin Scattering.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: June 22, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Colin C. Baker, Edward J. Friebele, Woohong Kim, L. Brandon Shaw, Jasbinder S. Sanghera
  • Patent number: 11035720
    Abstract: A warning device for preventing underground cables against accidental excavation comprises an optical fiber vibration sensor having a mode recognition function, a signal processing unit, a wireless communication unit and a power supply unit, wherein the signal processing unit is connected to the optical fiber vibration sensor, the wireless communication unit and the power supply unit, and the optical fiber vibration sensor is installed within a set range of a cable and is used to monitor vibration signals around the cable, so that once a behavior possibly endangering the cable occurs, an alarm is given out in time to reduce power transmission and transformation accidents. Compared with the prior art, the warning device has the advantages of low false alarm rate, rapid response and accurate localization region.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: June 15, 2021
    Assignee: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER COMPANY
    Inventors: Lijun Zhou, Yunjie Zhou, Xiaojuan Jiang, Hong Min, Tiecheng Lou, Jinhua Yu, Jia Chen, Kaibo Ma, Dekang Wen, Ting Ye, Qinqin Han, Ran An, Tianyu Yang, Chenyang Xuan, Yin Zhou, Chenbin Wu
  • Patent number: 11038596
    Abstract: Consistent with the present disclosure, codewords indicative of a super Gaussian distribution may be encoded and decoded using the encoders and decoders disclosed herein. Based on such codewords, symbols may be transmitted in accordance or in conformance with a super Gaussian distribution to tailor the SE of an optical signal or subcarrier for a given link having non-linear degradations and shaping gain. Such tailed SE may not be achievable with a Gaussian symbol transmission probability distribution.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: June 15, 2021
    Assignee: Infinera Corporation
    Inventor: Mohsen N. Tehrani
  • Patent number: 11029476
    Abstract: Examples herein relate to optical systems. In particular, implementations herein relate to an optical system including an optical transmitter configured to transmit optical signals. The optical transmitter includes a first optical source configured to emit light having different wavelengths, a waveguide, and an optical coupler configured to couple the emitted light from the first optical source to the waveguide. The optical transmitter further includes an array of two or more second optical sources coupled to the waveguide, each of the two or more second optical sources configured to be injection locked to a different respective wavelength of the emitted light transmitted via the waveguide from the first optical source. In some implementations, the first optical source is a master comb laser and the two or more second optical sources are slave ring lasers.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: June 8, 2021
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Di Liang, Zhixin Liu
  • Patent number: 10985519
    Abstract: A laser system based on nonlinear pulse compression and a LMA optical fiber therefor are provided. The LMA optical fiber is configured to amplify seed light pulses and promote the onset of nonlinear spectral broadening. The LMA optical fiber includes a first section having constant core and cladding diameters and receiving and supporting propagation of the light pulses in multiple transversal modes. The first section is configured to suppress high order modes propagating therealong. The LMA optical fiber further includes a tapered second section receiving the fundamental mode from the first section, the core and cladding diameters increasing gradually along said second section so as to provide an adiabatic transition of the fundamental mode. The LMA optical fiber further includes an optional third section having constant core and cladding diameters. Dispersive compression of the light pulses outputted by the LMA optical fiber provides excellent beam quality and high peak powers.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: April 20, 2021
    Assignee: Institut National D'Optique
    Inventors: Vincent Roy, Claude Paré, Louis Desbiens
  • Patent number: 10903087
    Abstract: A laser processing method for processing a substrate having a device formed on the front side, an electrode pad being formed on the device. The method includes applying a pulsed laser beam to the back side of the substrate at a position corresponding to the electrode pad, thereby forming a fine hole in the substrate so that the fine hole reaches the electrode pad, detecting first plasma light generated from the substrate by the application of the pulsed laser beam to the substrate and also detecting second plasma light generated from the electrode pad by the application of the pulsed laser beam to the electrode pad, and stopping the laser beam when the second plasma light is detected. Time intervals of the pulsed laser beam repeatedly applied to the same fine hole are set to 0.1 ms or more.
    Type: Grant
    Filed: October 11, 2019
    Date of Patent: January 26, 2021
    Assignee: DISCO CORPORATION
    Inventor: Hiroshi Morikazu
  • Patent number: 10879666
    Abstract: The present invention comprises a core (11) and a primary coating (12) that is lower in refractive index than the core (11) and that covers the side surface of the core (11) except in a coating-removed section (I0). The side surface of the core (11), in at least part of the coating-removed section (I0), is covered with an intermediate-refractive-index resin part (14) that is lower in refractive index than the core (11) and that is higher in refractive index than the primary coating (12).
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: December 29, 2020
    Assignee: FUJIKURA LTD.
    Inventor: Ryokichi Matsumoto
  • Patent number: 10862263
    Abstract: Good femtosecond fiber laser performance is achieved by producing picosecond Raman shifted pulses of sufficient intensity to undergo self-phase modulation (SPM), thus causing the pulses to advantageously spread spectrally, which then makes it possible to temporally compress the pulses with an optical compressor to produce femtosecond pulses with high peak power.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: December 8, 2020
    Assignee: MPB COMMUNICATIONS INC.
    Inventors: Alaa Al-Kadry, Vladimir Karpov, Wallace Raymond Lovett Clements
  • Patent number: 10855048
    Abstract: Briefly, methods and/or systems, are described for a wavelength-dispersive mode-locked fiber-ring laser, which generates an Airy beam profile for stable optical pulses.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: December 1, 2020
    Assignee: The University of Hong Kong
    Inventors: Kin Yip Kenneth Wong, Xiaoming Wei
  • Patent number: 10802120
    Abstract: In one embodiment, a lidar system includes a light source configured to emit (i) local-oscillator light and (ii) pulses of light, where each emitted pulse of light is coherent with a corresponding portion of the local-oscillator light. The lidar system also includes a receiver configured to detect the local-oscillator light and a received pulse of light, the received pulse of light comprising light from one of the emitted pulses of light that is scattered by a target located a distance from the lidar system. The local-oscillator light and the received pulse of light are coherently mixed together at the receiver. The receiver includes one or more detectors configured to produce one or more respective photocurrent signals corresponding to the coherent mixing of the local-oscillator light and the received pulse of light. The receiver also includes a pulse-detection circuit configured to determine a time-of-arrival for the received pulse of light.
    Type: Grant
    Filed: February 19, 2020
    Date of Patent: October 13, 2020
    Assignee: Luminar Technologies, Inc.
    Inventors: Joseph G. LaChapelle, Jason M. Eichenholz, Alex Michael Sincore
  • Patent number: 10782478
    Abstract: A differential mode attenuation compensator includes a first multi-mode optical fiber and a third multi-mode optical fiber in which a plurality of propagation modes propagate in a wavelength of a propagating optical signal; and a second multi-mode optical fiber including a core and a clad and arranged with a central axis aligned between the first multi-mode optical fiber and the third multi-mode optical fiber, in which each loss in the plurality of propagation modes is different in the first multi-mode optical fiber and the third multi-mode optical fiber.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: September 22, 2020
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masaki Wada, Taiji Sakamoto, Takayoshi Mori, Shinichi Aozasa, Takashi Yamamoto, Kazuhide Nakajima
  • Patent number: 10751833
    Abstract: A fiber coupling device includes a housing and a window provided in the housing. The fiber coupling device is configured to collectively guide plural laser beams to at least a first fiber, the plurality of laser beams each being emitted from a corresponding one of plural external laser light sources and entering through a laser beam inlet. The housing is configured such that the laser beams enter the housing from the laser beam inlet. The window is provided inside the housing and faces the laser beam inlet. The fiber coupling device is not required to detach when an optical axis is adjusted.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: August 25, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Doukei Nagayasu, Hitoshi Nishimura, Makoto Ryudo, Jingbo Wang, Yoshiaki Takenaka, Kiyotaka Eizumi, Hideaki Yamaguchi, Ryo Ishikawa, Masatoshi Nishio
  • Patent number: 10751834
    Abstract: An optical beam delivery device is formed of optical fibers configured for beam divergence or mode coupling control. An incident optical beam propagates through a first length of fiber, which is coupled to a second length of fiber and has a first refractive index profile (RIP). The first RIP enables, in response to an applied perturbation, modification of the beam characteristics of the incident optical beam to form an adjusted optical beam having modified beam characteristics relative to beam characteristics of the incident optical beam. The second length of fiber is formed with one or more confinement regions defining a second RIP and arranged to confine at least a portion of the adjusted optical beam. The second and first lengths of fiber are tapered in the direction of light beam propagation to control output beam divergence or susceptibility to beam mode coupling in the first length of fiber, respectively.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: August 25, 2020
    Assignee: nLIGHT, Inc.
    Inventors: Joona Koponen, Roger L. Farrow, Dahv A. V. Kliner
  • Patent number: 10749310
    Abstract: The invention relates to a MOPA laser system having at least one laser oscillator (MO), which generates laser radiation at an emission wavelength (?0), and having an optical amplifier (PA) downstream the laser oscillator (MO) in the propagation direction of the laser radiation, which optical amplifier amplifies the laser radiation and thereby spectrally broadens it to a useful bandwidth (??). It is an object of the invention to provide an improved MOPA laser system which is designed for a high power of the amplified laser radiation and which is insensitive to back-reflection. Unavoidable back-reflections should neither affect the output power of the optical amplifier (PA), nor lead to the destruction of the laser oscillator (MO) or other components of the system.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: August 18, 2020
    Assignee: Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V.
    Inventors: Nicoletta Haarlammert, Thomas Schreiber
  • Patent number: 10725243
    Abstract: A broadband light source apparatus, and corresponding method, includes a broadband light source configured to provide source light with a source wavelength spectrum having a centroid thermal sensitivity. The apparatus also includes a broadband optical filter characterized by a filter spectrum that has one or more spectral characteristics and a thermal sensitivity with magnitude and sign. The filter is configured to receive the source light and to deliver broadband output light with an output spectrum that is a function of the source and filter spectra and has an output centroid wavelength. The spectral characteristics and the magnitude and sign of the thermal sensitivity of the filter are configured to minimize a thermal sensitivity of the output centroid wavelength. The filter can be configured in view of a particular source spectrum to stabilize output centroid wavelength and maximize total output power passively with respect to ambient temperature fluctuations.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: July 28, 2020
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventor: Gilbert D. Feke
  • Patent number: 10714888
    Abstract: A pulsed electromagnetic-wave generator includes an excitation light source, a laser resonator, a pulse generating unit, and a wavelength converting unit. Excitation light from the excitation light source enters the laser resonator. The pulse generating unit is configured to generate a pulsed light group including at least two or more pulses with different frequencies (?) and different oscillation timings (t) in one excitation process of the excitation light source, an oscillation frequency difference (??) between the pulses in the pulsed light group being an integral multiple of a Free Spectral Range (FSR) of the laser resonator. The pulsed light group enters the wavelength converting unit. The wavelength converting unit is configured to generate a pulsed electromagnetic wave in which a wavelength of each pulse in the pulsed light group is converted.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: July 14, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Ikeoh, Yasuhiro Higashi, Yoshio Wada, Takumi Satoh, Hiroaki Minamide, Kouji Nawata, Yuma Takida
  • Patent number: 10705348
    Abstract: An optical power control system includes a laser source to provide an optical beam, a variable beam characteristics (VBC) fiber, and a controller operatively coupled to the VBC fiber and configured to control, in response to information indicating change in optical power of the optical beam, different states of perturbation so as to control optical power density.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: July 7, 2020
    Assignee: nLIGHT, Inc.
    Inventors: Robert J. Martinsen, Jacob L. Bell, Dahv A.V. Kliner, Roger L. Farrow
  • Patent number: 10698110
    Abstract: The disclosed embodiments include an apparatus and method of using a laser to scan the ground or a target from an airborne or ground-based platform. In certain embodiments, the apparatus and method produces a 3-D elevation model of the terrain. In some embodiments, the apparatus includes a pulsed laser, a receiver to detect and amplify the pulse after being reflected by objects on the ground (or the ground itself), and electronics which measures the time of flight of the optical pulse from which the slant range to the target is calculated. Technical advantages of the disclosed embodiments include avoiding blind zones to ensure that no laser shots are wasted. In certain embodiments for airborne applications, the apparatus may also be configured to maintain a constant swath width or constant spot spacing independent of aircraft altitude or ground terrain elevation.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: June 30, 2020
    Assignee: TELEDYNE DIGITAL IMAGING, INC.
    Inventors: Chris Verheggen, Joe Liadsky, Michael Sitar, Daryl Hartsell
  • Patent number: 10697761
    Abstract: There is provided a system for measuring temperature and strain simultaneously utilizing Brillouin Scattering within an optical fiber. The system has a cladding, a first optical core within the cladding and a second optical core within the cladding and having a different refractive index profile and/or composition than the first core. Means to couple light into and out of said individual optical cores and/or from one optical core to the other within the fiber is provided along with means for calculating strain and temperature characteristics based on measured Brillouin frequencies for said optical cores.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: June 30, 2020
    Assignee: OZ OPTICS LTD.
    Inventors: Omur M. Sezerman, Lufan Zou
  • Patent number: 10693273
    Abstract: A reflector includes a gain fiber and a periodic refraction structure unit. The gain fiber has a core doped with a rare earth element. The periodic refraction structure unit includes a high-refractive-index region that has a predetermined width, that is formed at a predetermined spacing along an optical axis direction of the gain fiber, that is formed across an entire section of the core that is orthogonal to the optical axis of the core, and that has a first refractive index, and a low-refractive-index region that is formed adjacent to the high-refractive-index region, that has a width equal to the predetermined spacing, and that has a second refractive index lower than the first refractive index. A width di of an ith periodic structure of refractive index in the periodic refraction structure unit is given by the equation di=Hi·(?/(2·ni))+?/(4·ni).
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: June 23, 2020
    Assignees: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA, TOYOTA SCHOOL FOUNDATION
    Inventors: Kazuo Hasegawa, Satoru Kato, Tomoya Okazaki, Kazuya Saito
  • Patent number: 10693275
    Abstract: A directly modulated semiconductor laser whose optical output can be modulated by varying the transmittance of an end reflector of the laser cavity. In an example embodiment, the end reflector can be implemented using a lightwave circuit in which optical waveguides are arranged to form an optical interferometer. At least one of the optical waveguides may include a waveguide section configured to modulate the phase of an optical beam passing therethrough in response to an electrical radio-frequency drive signal in a manner that causes the transmittance and reflectance of the end reflector to be modulated accordingly. Advantageously, relatively high (e.g., >10 GHz) phase and/or amplitude modulation speeds of the optical output can be achieved in this manner to circumvent the inherent modulation-speed limitations of the laser's gain medium.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: June 23, 2020
    Assignee: NOKIA SOLUTIONS AND NETWORKS OY
    Inventors: Po Dong, Guilhem De Valicourt
  • Patent number: 10682726
    Abstract: An optical beam delivery device. The device comprises a first length of fiber comprising a first RIP formed to enable the adjusting of one or more beam characteristics of an optical beam by a perturbation device. The optical beam delivery device further comprises a second length of fiber having a proximal end for receiving the optical beam from the first length of fiber and a distal end. The proximal end is coupled to the first length of fiber. The second length of fiber comprises a second RIP formed to confine at least a portion of the optical beam within one or more confinement regions. A beam modification structure is disposed at, or a distance from, the distal end of the second length of fiber. The beam modification structure is configured to modify at least one property of the optical beam chosen from beam divergence properties, beam spatial properties and beam directional characteristics.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: June 16, 2020
    Assignee: nLIGHT, Inc.
    Inventors: Ken Gross, Dahv A. V. Kliner, Roger Farrow
  • Patent number: 10677984
    Abstract: Disclosed are an optical beam delivery device, systems, and methods for sequentially adjusting, with respect to members of a set of confinement regions, a propagation path for establishing a controllable, temporally apparent intensity distribution. The disclosed techniques entail applying to a variable beam characteristics (VBC) fiber different states perturbation to change the propagation path and the members of the set of confinement regions through which a confined portion of an adjusted optical beam propagates, thereby establishing at an output end of the VBC fiber the controllable, temporally apparent intensity distribution.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: June 9, 2020
    Assignee: nLIGHT, Inc.
    Inventors: Aaron W. Brown, Dahv A. V. Kliner, Roger L. Farrow
  • Patent number: 10663769
    Abstract: Systems and methods for modifying an optical beam and adjusting one or more beam characteristics of an optical beam are provided. The system may include a first length of fiber operably coupled with an optical beam source and configured to receive an optical beam therefrom. The system may also include a perturbation device operably coupled with the first length of fiber and configured to modify the optical beam traversing therethrough, and a second length of fiber operably coupled with the first length of fiber and configured to receive the modified optical beam therefrom. The system may further include a beam shaping assembly configured to receive the modified optical beam from the second length of fiber, adjust one or more beam characteristics of the modified optical beam, and direct the adjusted optical beam to a downstream process.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: May 26, 2020
    Assignee: nLIGHT, Inc.
    Inventors: Scott Karlsen, Brian Victor, Dahv A. V. Kliner, Roger Farrow
  • Patent number: 10663768
    Abstract: An optical beam delivery device is configured to generate, from an optical beam, selectable intensity profiles. The device has a first length of fiber having a first refractive index profile (RIP), and a second length of fiber having second RIP that is different from the first RIP. The second length of fiber includes coaxial confinement regions arranged to confine at least a portion of an adjusted optical beam. The confined portion corresponds to an intensity distribution of different intensity distributions. The intensity distribution is established by a corresponding state of different states of perturbation that is applied to the device such that the confined portion is configured to provide, at an output of the second length of fiber, a selected intensity profile of the selectable intensity profiles.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: May 26, 2020
    Assignee: nLIGHT, Inc.
    Inventors: Robert J. Martinsen, Dahv A. V. Kliner, Roger L. Farrow
  • Patent number: 10620448
    Abstract: A speckle-free imaging light source based on a random fiber laser (RFL) using a strong-coupling multi-core optical fiber, relating to a field of optical fiber laser illumination light source, is provided, mainly including a pumping source and an optical fiber loop mirror, and further including the strong-coupling multi-core optical fiber with/without a single-mode optical fiber. Through directly adopting the strong-coupling multi-core optical fiber or combining the single-mode optical fiber with the strong-coupling multi-core optical fiber to serve as a main device in the RFL-based illumination light source, the generated RFL has multiple transvers modes and low spatial coherence which prevent speckle formation during illumination, which provides an ideal illumination light source for high-speed full-field speckle-free imaging technology.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: April 14, 2020
    Assignee: University of Electronic Science and Technology of China
    Inventors: Yunjiang Rao, Rui Ma, Weili Zhang, Bo Hu
  • Patent number: 10608399
    Abstract: A manufacturing technique of ultra-wideband high gain optical fibers and devices is disclosed, including: (1) manufacturing a gain fiber, which is a composite structural optical fiber, having a core composed of a plurality of sets of sector structures distributed symmetrically or a plurality of concentric ring structures. The core is composed of at least two kinds of rare-earth-ion-doped glass, and luminescence centers are located in different sector or ring structure regions; and (2) constructing a fiber laser: using the gain fiber, selectively exciting rare earth ions in different regions in the core by controlling a shape of pump light spot, and combining with fiber grating pairs to realize a tunable laser output. The present disclosure can manufacture gain fibers with high-gain and ultra-wideband characteristics by combining the design of the fiber structure and the control of the light field of the pump light.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: March 31, 2020
    Assignee: South China University of Technology
    Inventors: Zhongmin Yang, Guowu Tang, Zhishen Zhang