Patents by Inventor Johannes H. C. Van Heuven

Johannes H. C. Van Heuven 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).

  • Semiconductor laser or intensifier
    Patent number: 4376307
    Abstract: A semiconductor laser or traveling wave intensifier has an active layer between two passive semiconductor layers, and a strip-shaped electrode geometry. The active layer is uniform in thickness, while at least one of the passive layers within the strip-shaped geometry comprises a strip-shaped zone which contains portions having different refractive indices n.sub.1 and n.sub.2. According to the invention it holds that(n.sub.1 -n.sub.2) (d.sub.1 -d.sub.2)>0,wherein n.sub.1 is the refractive index of the portion which at least within said strip-shaped zone adjoins the active layer, d.sub.1 is the thickness thereof within the strip-shaped zone, and d.sub.2 is the thickness thereof beside the strip-shaped zone.
    Type: Grant
    Filed: May 15, 1980
    Date of Patent: March 8, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Tullio E. Rozzi, Johannes H. C. Van Heuven