Patents by Inventor M. Yasin A. Raja

M. Yasin A. Raja 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).

  • Wavelength-resonant surface-emitting semiconductor laser
    Patent number: 4881236
    Abstract: A wavelength resonant semiconductor gain medium is disclosed. The essential feature of this medium is a multiplicity of quantum-well gain regions separated by semiconductor spacer regions of higher bandgap. Each period of this medium consisting of one quantum-well region and the adjacent spacer region is chosen such that the total width is equal to an integral multiple of 1/2 the wavelength in the medium of the radiation with which the medium is interacting. Optical, electron-beam and electrical injection pumping of the medium is disclosed. This medium may be used as a laser medium for single devices or arrays either with or without reflectors, which may be either semiconductor or external.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: November 14, 1989
    Assignee: University of New Mexico
    Inventors: Steven R. J. Brueck, Christian F. Schaus, Marek A. Osinski, John G. McInerney, M. Yasin A. Raja, Thomas M. Brennan, Burrell E. Hammons