Patents Examined by Xinning (Tom) Niu
  • Patent number: 11081854
    Abstract: A laser oscillator capable of detecting scattered light intensity when a laser beam is incident on an end surface of a fiber more appropriately is provided. A laser oscillator monitoring control system includes: a scattered light detection unit that detects a scattered light intensity on an input end surface of a process fiber of a fiber laser oscillator; a control unit that controls a laser output value on the basis of a laser output command value from a CNC and a detection result obtained by the scattered light detection unit; a normal scattered light calculation unit that calculates a normal index value; a first threshold setting unit that sets a first threshold indicating an abnormality resulting from a contamination and/or a scratch; a second threshold setting unit that sets a second threshold indicating an abnormality resulting from an optical axis shift; and a third threshold setting unit that sets a third threshold indicating an abnormality of a level in which a component is destroyed.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: August 3, 2021
    Assignee: FANUC CORPORATION
    Inventor: Tatsuya Suzuki
  • Patent number: 11075503
    Abstract: A multi-section laser device is configured with a gain section and an integrated photodetector section. The photodetector section, rather than being a separate component, is integrated directly into the body of the laser. The integrated photodetector section absorbs photons generated by the gain section and creates a photocurrent that is proportional to the output of the multi-section laser device. The measured photocurrent is usable to calculate power output of the multi-section laser device and to identify any adjustments that may be needed to be made to the laser in order to achieve desired laser light output.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: July 27, 2021
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventors: Raymond Kirk Price, Yarn Chee Poon, Gambhir Ranjit
  • Patent number: 11063404
    Abstract: Disclosed are embodiments of bidirectionally emitting semiconductor (BEST) laser architectures including higher order mode suppression structures. The higher order mode suppression structures are centrally located and extend from an inner transition boundary, which may be established by confronting high reflector (HR) facets in some embodiments or a central plane defining two sides of a unitary, bidirectional optical cavity in other embodiments. Examples of the higher order mode suppression structures include narrow regions of bidirectional flared laser oscillator waveguide (FLOW) devices, which are also referred to as reduced mode diode (REM) devices; high-index regions of bidirectional higher-order mode suppressed laser (HOMSL) devices; and non- or less-etched gain-guided lateral waveguides of bidirectional low divergence semiconductor laser (LODSL) devices.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: July 13, 2021
    Assignee: nLIGHT, Inc.
    Inventor: Manoj Kanskar
  • Patent number: 11056856
    Abstract: Embodiments of the invention relate to a plasmonic laser including a substrate and a coaxial plasmonic cavity formed on the substrate and adapted to facilitate a plasmonic mode. The plasmonic laser further includes an electrical pumping circuit configured to electrically pump the plasmonic laser. The coaxial plasmonic cavity includes a peripheral plasmonic ring structure, a central plasmonic core and a gain structure arranged between the peripheral plasmonic ring structure and the central plasmonic core. The gain structure includes one or more ring-shaped quantum wells as gain material. The one or more ring-shaped quantum wells have a surface that is aligned orthogonal to a surface of the substrate. The electrical pumping circuit is configured to pump the plasmonic laser via the peripheral plasmonic ring structure and the central plasmonic core.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: July 6, 2021
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Svenja Mauthe, Kirsten Emilie Moselund
  • Patent number: 11038318
    Abstract: This disclosure relates to semiconductor quantum cascade lasers (QCLs). A three-terminal QCL device is disclosed. The three-terminal QCL device includes a unipolar multi-period quantum cascade laser structure embedded in a bipolar structure having three terminals providing at least two independently controllable biases to the QCL device for adjusting the lasing intensity and for tuning the lasing wavelength of the QCL device. The three-terminal QCL device further includes a quantum impedance matching structure for achieving high efficiency carrier injection and lowering lasing threshold. In addition, the multi-period quantum cascade laser structure is selectively doped to provide near charge neutrality during operation. The three-terminal QCL may further be controlled to achieve simultaneous dual- or multi-color lasing.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: June 15, 2021
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Jean-Pierre Leburton, John Michael Dallesasse
  • Patent number: 11031746
    Abstract: A semiconductor laser module includes a semiconductor laser device that outputs laser light; an optical fiber that includes a core portion and a cladding portion formed at an outer periphery of the core portion and that receives the laser light from one end and guides the laser light to the outside of the semiconductor laser module; an optical part disposed at an outer periphery of the optical fiber, having optical transmittance at a wavelength of the laser light, and that fixes the optical fiber; a first fixative that fixes the optical part and the optical fiber; and a housing that accommodates the semiconductor laser device and the one end of the optical fiber that receives the laser light, wherein an optical reflection reducing region treated to absorb the laser light and having a rough surface is formed around the optical part.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: June 8, 2021
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Yuta Ishige, Maiko Ariga, Masaki Iwama
  • Patent number: 11031747
    Abstract: The present embodiment relates to a light emitting device having a structure capable of removing zero order light from output light of an S-iPM laser. The light emitting device includes a semiconductor light emitting element and a light shielding member. The semiconductor light emitting element includes an active layer, a pair of cladding layers, and a phase modulation layer. The phase modulation layer has a basic layer and a plurality of modified refractive index regions, each of which is individually disposed at a specific position. The light shielding member has a function of passing through a specific optical image output along an inclined direction and shielding zero order light output along a normal direction of a light emitting surface.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: June 8, 2021
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Yoshitaka Kurosaka, Kazuyoshi Hirose, Takahiro Sugiyama, Yuu Takiguchi, Yoshiro Nomoto
  • Patent number: 11031751
    Abstract: The present embodiment relates to a light emitting device having a structure capable of removing zero order light from output light of an S-iPM laser. The light emitting device includes a semiconductor light emitting element and a light shielding member. The semiconductor light emitting element includes an active layer, a pair of cladding layers, and a phase modulation layer. The phase modulation layer has a basic layer and a plurality of modified refractive index regions, each of which is individually disposed at a specific position. The light shielding member has a function of passing through a specific optical image output along an inclined direction and shielding zero order light output along a normal direction of a light emitting surface.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: June 8, 2021
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Yoshitaka Kurosaka, Kazuyoshi Hirose, Takahiro Sugiyama, Yuu Takiguchi, Yoshiro Nomoto
  • Patent number: 11025032
    Abstract: A laser diode device includes: a first heat sink including a first mounting layer, in which the first mounting layer includes at least two mounting pads electrically isolated from one another; a second heat sink including a second mounting layer, in which the second mounting layer includes at least two mounting pads electrically isolated from one another; and a laser diode bar between the first heat sink and the second heat sink, in which a bottom electrical contact of the laser diode bar is mounted to the first mounting layer, and a top electrical contact of the laser diode bar is mounted to the second mounting layer.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: June 1, 2021
    Assignee: Trumpf Photonics, Inc.
    Inventors: Thilo Vethake, Stefan Heinemann
  • Patent number: 11018477
    Abstract: A tunable laser device is described. In one example, the tunable laser device includes an adaptive ring mirror, a gain waveguide, a loop mirror waveguide, and a booster amplifier waveguide. The gain waveguide and the boost amplifier waveguide can be formed in a semiconductor optical amplifier (SOA) region of the tunable laser device, and the adaptive ring mirror and the loop mirror waveguide can be formed in a silicon photonics region of the tunable laser device. The adaptive ring mirror includes a phase shifter optically coupled between a number of MMI couplers. By inducing a phase shift using the phase shifter, the wavelength of the output of the tunable laser device can be altered or adjusted for use in coherent fiber-optic communications, for example, among other applications.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: May 25, 2021
    Assignee: MACOM Technology Solutions Holdings, Inc.
    Inventor: Haruhisa Soda
  • Patent number: 11005227
    Abstract: A high-power fiber laser produces a compound output beam having a center beam and an annular beam. The center beam and the annular beam are independently adjustable in power and wavelength. The output beam is delivered from an output optical fiber having a center core and a concentric annular core. A fundamental beam generated by a seed laser is amplified by a fiber amplifier and partially converted to a second-harmonic beam by a second-harmonic generator. The residual fundamental beam and second-harmonic beam are separated, attenuated, and selectively coupled into the cores of the output optical fiber.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: May 11, 2021
    Assignee: Nufern
    Inventors: Peyman Ahmadi, Peter Andrew Rosenthal
  • Patent number: 10998696
    Abstract: A vertical cavity surface emitting laser includes a first laminate including first semiconductor layers having a first Al composition, and second semiconductor layers having a second Al composition greater than the first Al composition; a current confinement structure including a current aperture and a current blocker; a first compound semiconductor layer adjacent to the current confinement structure; and a second compound semiconductor layer adjacent to the first laminate and the first compound semiconductor layer. The first compound semiconductor layer has a first aluminum profile changing monotonously in a direction from the first laminate to the current confinement structure from a first minimum Al composition within a range greater than the first Al composition and smaller than the second Al composition to a first maximum Al composition. The second compound semiconductor layer has an Al composition greater than the first Al composition and smaller than the first maximum Al composition.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: May 4, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Natsumi Kaneko, Yutaka Onishi, Takeshi Aoki
  • Patent number: 10992109
    Abstract: A device includes a substrate, a first vertical cavity surface emitting laser (VCSEL) array on the substrate, a second VCSEL array on the substrate and adjacent to the first VCSEL array, and an isolation structure between the first VCSEL array and the second VCSEL array. The isolation structure provides electrical isolation between the first VCSEL array and the second VCSEL array.
    Type: Grant
    Filed: July 19, 2019
    Date of Patent: April 27, 2021
    Assignee: Lumentum Operations LLC
    Inventor: Albert Yuen
  • Patent number: 10971898
    Abstract: Disclosed herein is a system comprising: an optical system with a focal plane; an apparatus at the focal plane; a filter; wherein the apparatus comprises an array of vertical-cavity surface-emitting lasers (VCSELs) on a first substrate and an array of detectors on a second substrate, the detectors configured to detect laser beams that are emitted by the VCSELs and backscattered by an object; wherein the first substrate is mounted to the second substrate and is configured to allow the laser beams that are emitted by the VCSELs and backscattered by the object to transmit through the first substrate and reach the detectors; wherein the filter is configured to prevent light other than the laser beams from passing.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: April 6, 2021
    Assignee: Shenzhen Genorivision Technology Co., Ltd.
    Inventors: Peiyan Cao, Yurun Liu
  • Patent number: 10965091
    Abstract: The present invention relates to a novel stand-off distance chemical detector system such as can be used, for example, for standoff detection of explosives. Instead of a conventional lasing medium, a Pr:YAG or Pr:BYF based UV laser is used which can be advantageously implemented in Raman spectroscopy.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: March 30, 2021
    Assignee: Alakai Defense Systems, Inc.
    Inventors: Robert Douglas Waterbury, Darius Vunck, Robert Dean Babnick, Timothy Molner, Hunter Hardy, Ed Dottery, Robert McKinney, David Welford
  • Patent number: 10965087
    Abstract: Provided is a laser device that includes a laser chamber in which a pair of discharge electrodes are disposed; a line narrowing optical system including a grating disposed in a position outside the laser chamber; a beam expander optical system that increases a diameter of a light beam, outputted from the laser chamber and traveling toward the grating, in a first direction parallel to a discharge direction between the discharge electrodes and in a second direction orthogonal to the discharge direction; and a holding platform that is formed as a component separate from the laser chamber and the grating, holds the beam expander optical system, and forms along with the beam expander optical system a beam expander unit.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: March 30, 2021
    Assignee: Gigaphoton Inc.
    Inventors: Hirotaka Miyamoto, Osamu Wakabayashi
  • Patent number: 10958037
    Abstract: It is provided a laser arrangement, having an electro-absorption-modulated laser, having a laser section and an electro-absorption modulator section; a current source for supplying the laser section with current; a DC voltage source that is arranged in addition to the current source and can be used to apply DC voltage to a diode structure of the electro-absorption modulator section; a driver with which an RF signal is able to be fed to the laser; and an electrical connection via which the driver is connected to the laser. The electrical connection provides a direct current connection between the driver and the laser such, and the driver is configured such, that a photocurrent that is generated in the electrode-absorption modulator section of the laser by illumination with light of the laser section at least partially flows to the driver and at least contributes to the energy supply of the driver.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: March 23, 2021
    Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FĂ–RDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Jung Han Choi, Heinz-Gunter Bach, Lei Yan
  • Patent number: 10944238
    Abstract: An optical member holding device includes a holding member, an optical member and an elastic member. The holding member has a recess defined by one or more lateral surfaces and a bottom surface with a through-hole opening at the bottom surface. The optical member is disposed on the bottom surface of the recess, and includes a light transmissive part. The optical member has an upper surface and one or more lateral surfaces. The elastic member consists of an inorganic material. The elastic member includes a main part disposed on the upper surface of the optical member, and a plurality of supporting parts each extending outward and bending downward to be in contact with the one or more lateral surfaces of the recess and the one or more lateral surfaces of the optical member to exert elastic force that secures the optical member in a predetermined location in the recess.
    Type: Grant
    Filed: November 14, 2018
    Date of Patent: March 9, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Hiroaki Kuroda, Tomonori Miyoshi
  • Patent number: 10935802
    Abstract: A spectral beam combining system includes a plurality of input fibers and a prism having a curved input surface. The plurality of input fibers are attached to the curved input surface. The spectral beam combining system also includes an immersion grating defined on a second surface of the prism, a protective cap disposed over the immersion grating, and an output surface.
    Type: Grant
    Filed: January 9, 2020
    Date of Patent: March 2, 2021
    Assignee: RAM Photonics, LLC
    Inventor: John R. Marciante
  • Patent number: 10938176
    Abstract: The present invention relates to a diode laser with external spectrally selective feedback. It is an object of the invention is to provide an external cavity diode laser with wavelength stabilization which allows an increased overall output power in the desired wavelength range.
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: March 2, 2021
    Assignee: HIGHYAG LASERTECHNOLOGIE GMBH
    Inventors: Haro Fritsche, Ralf Koch, Bastian Kruschke, Fabio Ferrario