Patents by Inventor Guey-Wu Chang

Guey-Wu Chang 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: 8184667
    Abstract: The configurations of an electro-optic Bragg deflector and the methods of using it as a laser Q-switch in a Q-switched laser and in a Q-switched wavelength-conversion laser are provided. As a first embodiment, the electro-optic Bragg deflector comprises an electrode-coated electro-optic material with one of a 1D and a 2D spatially modulated electro-optic coefficient. When a voltage is supplied to the electrodes, the electro-optic material behaves like a Bragg grating due to the electro-optically induced spatial modulation of the refractive index. The second embodiment relates to an actively Q-switched laser, wherein the electro-optic Bragg deflector functions as a laser Q-switch. The third embodiment of the present invention combines the Q-switched laser and a laser-wavelength converter to form a Q-switched wavelength-conversion laser, wherein the EO Bragg deflector can be monolithically integrated with a quasi-phase-matching wavelength converter in a fabrication process.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: May 22, 2012
    Assignee: National Tsing Hua University
    Inventors: An-Chung Chiang, Shou-Tai Lin, Yen-Chieh Huang, Yen-Yin Lin, Guey-Wu Chang
  • Publication number: 20110075688
    Abstract: The configurations of an electro-optic Bragg deflector and the methods of using it as a laser Q-switch in a Q-switched laser and in a Q-switched wavelength-conversion laser are provided. As a first embodiment, the electro-optic Bragg deflector comprises an electrode-coated electro-optic material with one of a 1D and a 2D spatially modulated electro-optic coefficient. When a voltage is supplied to the electrodes, the electro-optic material behaves like a Bragg grating due to the electro-optically induced spatial modulation of the refractive index. The second embodiment relates to an actively Q-switched laser, wherein the electro-optic Bragg deflector functions as a laser Q-switch. The third embodiment of the present invention combines the Q-switched laser and a laser-wavelength converter to form a Q-switched wavelength-conversion laser, wherein the EO Bragg deflector can be monolithically integrated with a quasi-phase-matching wavelength converter in a fabrication process.
    Type: Application
    Filed: December 9, 2010
    Publication date: March 31, 2011
    Applicant: NATIONAL TSING HUA UNIVERSITY
    Inventors: An-Chung Chiang, Shou-Tai Lin, Yen-Chieh Huang, Yen-Yin Lin, Guey-Wu Chang
  • Publication number: 20090059967
    Abstract: The configurations of an electro-optic Bragg deflector and the methods of using it as a laser Q-switch in a Q-switched laser and in a Q-switched wavelength-conversion laser are provided. As a first embodiment of the present invention, the electro-optic Bragg deflector comprises an electrode-coated electro-optic material with a spatially modulated electro-optic coefficient. When a voltage is supplied to the electrodes, the electro-optic material behaves like a Bragg grating due to the electro-optically induced spatial modulation of the refractive index. The second embodiment of the present invention relates to an actively Q-switched laser, wherein the electro-optic Bragg deflector functions as a laser Q-switch. The third embodiment of the present invention combines the Q-switched laser and a laser-wavelength converter to form a Q-switched wavelength-conversion laser, wherein the EO Bragg deflector can be monolithically integrated with a quasi-phase-matching wavelength converter in a fabrication process.
    Type: Application
    Filed: February 28, 2008
    Publication date: March 5, 2009
    Applicant: NATIONAL TSING HUA UNIVERSITY
    Inventors: An-Chung Chiang, Shou-Tai Lin, Yen-Chieh Huang, Yen-Yin Lin, Guey-Wu Chang