Patents by Inventor Steven R. Bowman

Steven R. Bowman 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).

  • Optically addressed spatial light modulator using an intrinsic semiconductor active material and high resistivity cladding layers
    Patent number: 5637883
    Abstract: An optically addressed spatial light modulator includes top and bottom conductive layers sandwiching an intrinsic semiconductor multilayer structure. A cladding layer having a high trapping density is sandwiched between at least one of the electrodes and the intrinsic semiconductor layer structure. Typically, one cladding layer will be sandwiched between the top conductive layer and the intrinsic semiconductor multilayer structure and another cladding layer will be sandwiched between the bottom conductive layer and the intrinsic semiconductor structure. The cladding layer or layers laterally confine the photocarriers generated within the intrinsic semiconductor multilayer structure.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: June 10, 1997
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Steven R. Bowman, William S. Rabinovich, Douglas S. Katzer, Harry B. Dietrich
  • Optically pumped, praseodymium based solid state laser
    Patent number: 5535232
    Abstract: The present invention is a solid state laser, including: (1) a laser cavity defined by a first mirror and an opposing second mirror, where these mirrors are reflective at the output wavelength of the laser; (2) a laser medium disposed in the laser cavity, including a low phonon energy host material, doped with an amount of praseodymium ions sufficient to produce a longitudinal mode laser emission from the transition of the praseodymium ions from the .sup.3 F.sub.3 excited state to a lower energy state when the laser medium is pumped by an appropriate pump, where the energy gap between the .sup.3 F.sub.3 excited state and the lower energy state corresponds to the output wavelength of the laser; and (3) a pump for the laser medium.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: July 9, 1996
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Steven R. Bowman, Joseph Ganem, Barry J. Feldman
  • Holmium quasi-two level laser
    Patent number: 5287378
    Abstract: The directly pumped holmium (Ho) quasi-two level laser of the invention comprises a directly pumped holmium laser having a host material doped with an amount of holmium ions sufficient to produce an output laser emission at a wavelength of about 2.1 .mu.m when the holmium laser is pumped by a pump beam at a wavelength of about 2 .mu.m and a pumping laser for producing the pump beam. In an exemplary embodiment, the pumping laser comprises a Cr,Tm:YAG laser pumped by a flashlamp.
    Type: Grant
    Filed: December 30, 1992
    Date of Patent: February 15, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Steven R. Bowman, Barry J. Feldman
  • Holmium laser pumped with a neodymium laser
    Patent number: 5036520
    Abstract: A solid-state laser device includes a neodymium laser pump source capable outputting a pump beam of about 1.1 .mu.m wavelength, and a holmium laser being pumped by said 1.1 .mu.m pump beam to generate an output laser beam of about 3 .mu.m wavelength.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: July 30, 1991
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Steven R. Bowman, William S. Rabinovich