Patents by Inventor H. Dean Stovall

H. Dean Stovall 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).

  • Method and apparatus for correcting amplitude variation in electro-optic laser systems
    Patent number: 5018153
    Abstract: A method and apparatus which corrects the amplutide variation in the output in an electro-optic modulated laser system (10). Birefringence within the electro-optic crystal (25) causes elliptical polarization of the linearly polarized laser light (22) produced by the laser gain medium (16), in turn causing a loss in the laser output (27). The loss owing to the elliptical polarization is corrected by either applying a D.C. bias from voltage source (30) directly to the electro-optic crystal (25) or by inserting a quarter-wave plate (32) within the laser's resonant cavity.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: May 21, 1991
    Assignee: Hughes Aircraft Company
    Inventors: Kuei-Ru Chien, Robin A. Reeder, H. Dean Stovall
  • Crystal modulated laser with improved resonator
    Patent number: 4885752
    Abstract: The laser (10) has a crystal modulator (22) located at one end (16) of the laser gain medium (12) opposite the end (14) to which the total reflector or grating (18) is attached. The outcoupler (28) is spaced a predetermined nonzero distance apart from the edge (30) of the crystal (22). The spacing (d) is selected to overcome and compensate for distortions caused by thermal lensing effects in the crystal (22).
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: December 5, 1989
    Assignee: Hughes Aircraft Company
    Inventors: Kuei-Ru Chien, Kin-Kwok Hui, H. Dean Stovall, John H. S. Wang, Albert J. Lamm