Patents by Inventor Eric A. Lundstrom

Eric A. Lundstrom 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).

  • Output coupler for laser resonator
    Patent number: 4461009
    Abstract: A laser output coupler utilizes a birefrigent lens which has one side thereof curved so as to present a non-uniform polarization distribution across the face of the lens. A polarized beam splitter is employed to separate the output beam from the feedback beam; the feedback beam having a non uniform distribution across the laser aperture enhances mode discrimination of a pulsed resonator.
    Type: Grant
    Filed: September 15, 1981
    Date of Patent: July 17, 1984
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Eric A. Lundstrom
  • Waveplate for correcting thermally induced stress birefringence in solid state lasers
    Patent number: 4408334
    Abstract: Thermally induced stress birefringence in laser resonators is eliminated by inserting a waveplate in the resonating cavity. The waveplate is chosen by matching its polarization transmission matrix to the polarization transmission matrices of the laser rod and a Porro prism used as an end reflector in the resonating cavity. This produces a total polarization transmission matrix in the resonating cavity which is independent of ray coordinates. Additional control of the polarization transmission matrix is provided using a Porro prism as a cavity reflector that has an antireflection coating on its roof to change the required phase advance angle of the waveplate.
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: October 4, 1983
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Eric A. Lundstrom