Patents by Inventor John Sigfred Osmundson

John Sigfred Osmundson 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).

  • Length controlled stabilized mode-lock Nd:YAG laser
    Patent number: 4025875
    Abstract: A method and apparatus for stabilizing the amplitude and repetition rate of mode-locked Nd:YAG laser pulses by controlling the laser length through a feedback loop is described. The end mirror of the laser is mounted on a piezoelectric crystal which is dithered at a low frequency. A portion of fundamental 1.06 micrometer laser radiation is converted into its second harmonic frequency and the average power of the second harmonic frequency is detected by an integrating detector. The amount of the power of the second harmonic frequency depends on the match between the optical length of the laser cavity and the mode-lock frequency. The length is controlled by a feedback loop which phase compares the output of the second harmonic detector to the piezoelectric crystal dither signal.
    Type: Grant
    Filed: January 5, 1976
    Date of Patent: May 24, 1977
    Inventors: James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher, John Sigfred Osmundson