Patents by Inventor Anthony W. Yu

Anthony W. Yu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10530114
    Abstract: The disclosed subject matter relates to a polarization-maintaining very large mode area (PM VLMA) Erbium-doped fiber and a polarization maintaining, Er-doped VLMA amplifier.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: January 7, 2020
    Assignee: United States of America as represented by the Administrator of NASA
    Inventors: Mark A. Stephen, Anthony W. Yu, Jeffrey W. Nicholson
  • Patent number: 10450650
    Abstract: The present invention relates to a method of manufacturing large area graphene for graphene-based photonics devices such as bolometric graphene detectors, or for use as a saturable absorber in ultra-high bandwidth detectors for producing ultrafast laser pulses. The method includes: growing a first graphene layer on one side of a metal substrate, and a second graphene layer on another side of the metal substrate; coating the first graphene layer with a plurality of resist layers including a low molecular weight polymethylmethacrylate, and a high molecular weight polymethylmethacrylate; removing the second graphene layer and the metal substrate to reveal the first graphene layer; disposing the first graphene layer on an optical substrate; and removing the plurality of resist layers from the first graphene layer to reveal a final graphene layer, which can be used as the basis to manufacture a multilayer graphene structure for graphene detectors.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: October 22, 2019
    Assignee: The United States of America as represented by the Admininstrator of the National Aeronautics and Space Administration
    Inventors: Mahmooda Sultana, Mary J. Li, Anthony W. Yu
  • Patent number: 10429243
    Abstract: The present invention relates an apparatus and method for measuring range-resolved atmospheric sodium temperature profiles using a space-based Lidar instrument, including a diode-pumped Q-switched self-Raman c-cut Nd:YVO4 laser with intra-cavity frequency doubling that could produce multi-watt 589 nm wavelength output. The c-cut Nd:YVO4 laser has a fundamental wavelength that is tunable from 1063-1067 nm. A continuous wave narrow linewidth diode laser is used as an injection seeder to provide single-frequency grating tunable output around 1066 nm. The injection-seeded self-Raman shifted Nd:VO4 laser is tuned across the sodium vapor D2 line at 589 nm. In one embodiment, a space-qualified frequency-doubled 9 Watt at 532 nm wavelength Nd:YVO4 laser, is utilized with a tandem interference filter temperature-stabilized fused-silica-etalon receiver and high-bandwidth photon-counting detectors.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: October 1, 2019
    Assignee: U.S.A. as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Anthony W. Yu, Michael A. Krainak, Diego Janches, Sarah L. Jones, Branimir Blagojevic
  • Publication number: 20190067895
    Abstract: The disclosed subject matter relates to a polarization-maintaining very large mode area (PM VLMA) Erbium-doped fiber and a polarization maintaining, Er-doped VLMA amplifier.
    Type: Application
    Filed: August 31, 2017
    Publication date: February 28, 2019
    Inventors: MARK A. STEPHEN, ANTHONY W. YU, JEFFREY W. NICHOLSON
  • Publication number: 20180058935
    Abstract: The present invention relates an apparatus and method for measuring range-resolved atmospheric sodium temperature profiles using a space-based Lidar instrument, including a diode-pumped Q-switched self-Raman c-cut Nd:YVO4 laser with intra-cavity frequency doubling that could produce multi-watt 589 nm wavelength output. The c-cut Nd:YVO4 laser has a fundamental wavelength that is tunable from 1063-1067 nm. A continuous wave narrow linewidth diode laser is used as an injection seeder to provide single-frequency grating tunable output around 1066 nm. The injection-seeded self-Raman shifted Nd:VO4 laser is tuned across the sodium vapor D2 line at 589 nm. In one embodiment, a space-qualified frequency-doubled 9 Watt at 532 nm wavelength Nd:YVO4 laser, is utilized with a tandem interference filter temperature-stabilized fused-silica-etalon receiver and high-bandwidth photon-counting detectors.
    Type: Application
    Filed: August 25, 2016
    Publication date: March 1, 2018
    Inventors: ANTHONY W. YU, MICHAEL A. KRAINAK, Diego Janches, Sarah L. Jones, Branimir Blagojevic
  • Publication number: 20170088944
    Abstract: The present invention relates to a method of manufacturing large area graphene for graphene-based photonics devices such as bolometric graphene detectors, or for use as a saturable absorber in ultra-high bandwidth detectors for producing ultrafast laser pulses. The method includes: growing a first graphene layer on one side of a metal substrate, and a second graphene layer on another side of the metal substrate; coating the first graphene layer with a plurality of resist layers including a low molecular weight polymethylmethacrylate, and a high molecular weight polymethylmethacrylate; removing the second graphene layer and the metal substrate to reveal the first graphene layer; disposing the first graphene layer on an optical substrate; and removing the plurality of resist layers from the first graphene layer to reveal a final graphene layer, which can be used as the basis to manufacture a multilayer graphene structure for graphene detectors.
    Type: Application
    Filed: September 24, 2015
    Publication date: March 30, 2017
    Inventors: Mahmooda Sultana, Mary J. Li, Anthony W. Yu
  • Patent number: 7050222
    Abstract: High power, low degree of polarization superluminescent diodes (SLDS) are described. A semiconductor optical amplifier (SOA) which amplifies light in substantially one polarizaton state can be used to create a SLD by combining the output from both sides of this polarization sensitive SOA in a manner which results in a depolarized output.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: May 23, 2006
    Assignee: Covega, Inc.
    Inventors: Anthony W. Yu, Stewart W. Wilson, Dennis Bowler, Peter J. S. Heim, Scott A. Merritt
  • Patent number: 7002733
    Abstract: An optical amplification device includes a depolarizer for reducing the polarization sensitivity requirements on an SOA by changing the input to the SOA from having an arbitrary (unknown) polarization state to a known (depolarized) state. The depolarizer receives an input optical signal and outputs a depolarized, optical signal, and a semiconductor optical amplifier (SOA) receives the depolarized optical signal and outputs an amplified optical signal.
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: February 21, 2006
    Assignee: Quantum Photonics, Inc.
    Inventors: Mario Dagenais, Stewart W Wilson, Anthony W. Yu, Peter J. S. Heim
  • Publication number: 20040150876
    Abstract: An optical amplification device includes a depolarizer for reducing the polarization sensitivity requirements on an SOA by changing the input to the SOA from having an arbitrary (unknown) polarization state to a known (depolarized) state. The depolarizer receives an input optical signal and outputs a depolarized, optical signal, and a semiconductor optical amplifier (SOA) for receives the depolarized optical signal and outputs an amplified optical signal.
    Type: Application
    Filed: January 30, 2003
    Publication date: August 5, 2004
    Inventors: Mario Dagenais, Stewart Wayne Wilson, Anthony W. Yu, Peter J.S. Heim
  • Publication number: 20030155486
    Abstract: An optical alignment device is provided comprising a base portion extending the length of the alignment device, a substantially horizontal package mounting portion coupled to the base portion, and a component retaining portion coupled to the base portion.
    Type: Application
    Filed: August 1, 2002
    Publication date: August 21, 2003
    Applicant: QUANTUM PHOTONICS
    Inventors: Frankie Rogers, Anthony W. Yu, James Sung Cho, Stewart Wayne Wilson
  • Patent number: 4723841
    Abstract: A variable transmission output coupler and deviationless tuner forms a part of a tunable laser cavity. The device uses frustrated total internal reflection to provide variable output coupling and laser tunability simultaneously. Two Pellin-Broca prisms are pressed against each other by a variable spring pressure mechanism. An adjustable screw regulates the variable force, controlling the thickness of an air film between two prism faces. The Pellin-Broca prisms enable tuning the laser without angular deviation of the output beam. All beams enter and exit at Brewster's Angle, minimizing losses. No coatings are used on the optical elements, reducing the possibility of damage at high operating power of the laser. The coupler may be used in pulsed as well as continuous wave lasers.
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: February 9, 1988
    Assignee: Georgia Tech Research Corporation
    Inventors: Rajarshi Roy, Anthony W. Yu