Patents by Inventor David S. Spence

David S. Spence 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).

  • Methods and systems to enhance multiple wave mixing process
    Patent number: 7292387
    Abstract: Frequency conversion methods are taught wherein non-collinear phase matching configurations may be implemented in non-linear crystals used in three wave mixing processes such that the frequency conversion efficiency is enhanced through walk-off compensation while also maximizing conversion efficiency. The harmonic conversion techniques are especially applicable to sum frequency process, and in particular to third harmonic generation.
    Type: Grant
    Filed: January 12, 2006
    Date of Patent: November 6, 2007
    Assignee: Spectra-Physics, Inc.
    Inventors: Hanna J. Hoffman, David S. Spence, Alan B. Petersen, James D. Kafka