Patents by Inventor William K. Bischel

William K. Bischel 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).

  • Method and apparatus for producing laser radiation following two-photon excitation of a gaseous medium
    Patent number: 4140978
    Abstract: Method and apparatus for producing laser radiation by two-photon optical pumping of an atomic or molecular gaseous medium and subsequent lasing action. A population inversion is created as a result of two-photon absorption of the gaseous species. Stark tuning is utilized, if necessary, in order to tune the two-photon transition into exact resonance. In particular, gaseous ammonia (NH.sub.3) or methyl fluoride (CH.sub.3 F) is optically pumped by a pair of CO.sub.2 lasers to create a population inversion resulting from simultaneous two-photon excitation of a high-lying vibrational state, and laser radiation is produced by stimulated emission of coherent radiation from the inverted level.
    Type: Grant
    Filed: April 29, 1977
    Date of Patent: February 20, 1979
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: William K. Bischel, Ralph R. Jacobs, Donald Prosnitz, Charles K. Rhodes, Patrick J. Kelly