Patents by Inventor Chandra Kumar

Chandra Kumar 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).

  • Infrared polarization rotator and optical switch
    Patent number: 4093344
    Abstract: An optical polarization rotator is developed for use with infrared radiation using a nonlinear, two-photon interaction in a solid medium. The mechanism employed is resonance dispersion, where the sum frequency of an infrared beam to be rotated and a visible control beam is close to the frequency of a two-photon transition of exciton states, thereby producing different amounts of dispersion for the two orthogonal components of the linearly polarized infrared beam. The result of a phase difference between the two components is a rotation of the plane of polarization of the infrared beam.
    Type: Grant
    Filed: November 5, 1976
    Date of Patent: June 6, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Theodoor Charlouis Damen, Erich Gornik, Van-Tran Nguyen, Chandra Kumar Naranbhai Patel