Patents by Inventor Ronald R. Drenten

Ronald R. Drenten 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).

  • Device for doubling the frequency of a light wave
    Patent number: 5218661
    Abstract: A device for doubling the frequency of a light wave and having a satisfactory waveguide action is obtained in a simple manner by providing, in a nonlinear optical material 11, periodic domains 12 having a reduced second-order susceptibility and an increased refractive index relative to the nonlinear optical material by means of proton exchange or proton implantation. By means of a heat treatment, the refractive index of the material in the periodic domains is reduced to a value which is less than 0.10 higher than that of the nonlinear optical material, thus obtaining a low degree of light scattering.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: June 8, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Richard B. J. Droste, Ronald R. Drenten, Michiel J. Jongerius
  • Optical device with phase-locked diodelaser array
    Patent number: 4822151
    Abstract: A polarization-rotator (22) and a polarization-sensitive beam combiner (30') are arranged in the radiation path between a phase-locked diode laser array (10) radiating in a stable supermode and a collimator lens (46). The two radiation lobes (11, 12) are superposed so that a single radiation spot (S) can be obtained. The quality of the spot can be improved by an arrangement of a prism system (40) and a spatial filter (45) in the lateral far field.
    Type: Grant
    Filed: March 2, 1988
    Date of Patent: April 18, 1989
    Assignees: Hitachi Ltd., U.S. Philips Corporation
    Inventors: Kimio Tatsuno, Jan Opschoor, Carolus J. van der Poel, Ronald R. Drenten