Patents by Inventor Martin B. Small

Martin B. Small 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).

  • Heterostructure diode injection laser having a constricted active region
    Patent number: 4166253
    Abstract: In a heterostructure diode injection laser, the active layer has a region of relatively lesser thickness in registration with a stripe geometry contact. Increased gain within the region of lesser thickness relative to adjacent regions of greater thickness tends to effectively confine lasing operation to the thinner or constricted region. The dimensions of the constricted active region may be readily selected to discriminate against multifilament lasing modes in order to produce a single spot laser beam over a wide range of injection levels.
    Type: Grant
    Filed: August 15, 1977
    Date of Patent: August 28, 1979
    Assignee: International Business Machines Corporation
    Inventors: Martin B. Small, Peter S. Zory, Jr.