Patents by Inventor Robert W. Lodenkamper

Robert W. Lodenkamper 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).

  • High power single mode semiconductor lasers and optical amplifiers using 2D Bragg gratings
    Patent number: 6366598
    Abstract: A waveguide (10) is provided having a two-dimensional optical wavelength Bragg grating (20) embedded within a semiconductor laser medium (16). More particularly, the waveguide (10) includes an active region (16) sandwiched between n-doped and p-doped cladding layers (14, 22). The two-dimensional Bragg grating (20) is formed in the active region (16). Upper and lower electrodes (24, 26) are defined on opposite sides of the cladding layers (14, 22) to complete the waveguide structure (10). The two-dimensional grating (20) provides simultaneous frequency selective feedback for mode control in both the longitudinal and lateral directions.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: April 2, 2002
    Assignee: TRW Inc.
    Inventors: Doyle T. Nichols, Srinath Kalluri, Michael G. Wickham, Timothy A. Vang, Michael P. Nesnidal, Robert W. Lodenkamper
  • Stabilization of injection locking of CW lasers
    Patent number: 6359913
    Abstract: An injection locking system for lasers. In particular, a signal from a master laser is phase modulated and injected into a slave laser. The phase difference &phgr; is maintained at zero by way of a phase locked loop. By maintaining the phase difference &phgr; at zero, the frequency drift is compensated by maintaining the frequency within a predetermined locking range.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: March 19, 2002
    Assignee: TRW Inc.
    Inventor: Robert W. Lodenkamper