Patents by Inventor Andreas Hemmerich

Andreas Hemmerich 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).

  • Solid state laser operating with frequency doubling and stabilized by an external resonator
    Patent number: 5068546
    Abstract: Solid state laser comprising a solid state laser diode for generating fundamental wave laser radiation; an external ring resonator which is arranged in the beam path of the fundamental wave laser radiation and through which the fundamental wave laser radiation passes in a predetermined forward direction; an optical nonlinear medium arranged in the ring resonator for generating the 2nd harmonic of the fundamental wave laser radiation; and an arrangement for feeding fundamental wave laser radiation back to the solid state laser diode which includes a scattering optical element which is arranged in the beam path of the fundamental wave laser radiation of the ring resonator and which causes a small part of the fundamental wave laser radiation to propagate in a direction opposite to the forward direction through the beam path back to the solid state laser diode.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: November 26, 1991
    Assignee: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.
    Inventors: Andreas Hemmerich, David McIntyre, Claus Zimmermann, Theodor Haensch