Patents by Inventor Francois Pradere

Francois Pradere 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).

  • Production of short light pulses by time compression
    Patent number: 4618783
    Abstract: Mono-pulses of light are generated by time compression of laser energy. A Raman medium is located in a low Q energy storage cavity having low losses for light at a predetermined frequency and energy delivered by a laser is that frequency in the storage cavity. The Raman medium is also located in a Stokes cavity dimensioned for having a high gain at a Stokes frequency. Most of the stored energy at the Stokes frequency is extracted by a single to and fro travel through the Stokes cavity.
    Type: Grant
    Filed: April 23, 1984
    Date of Patent: October 21, 1986
    Assignee: Centre National de la Rechereche Scientifique
    Inventors: Francois Pradere, Robert Frey
  • Process and device for delivering a monochromatic light beam by stimulated scattering
    Patent number: 4348599
    Abstract: For generation of a light beam having a narrow linewidth, an energy extraction beam of narrow linewidth, typically from a pulsed laser, is directed into a Raman medium having a large stimulated line. A second source, typically a pulsed laser, delivers a beam coaxial to the first in the medium. The frequency of the first beam is within the stimulated emission line of the medium induced by the second frequency and energy transfer occurs from the second to the first beam without substantial increase in the spectral linewidth.
    Type: Grant
    Filed: May 15, 1981
    Date of Patent: September 7, 1982
    Assignee: Centre Nationale de la Recherche Scientifique
    Inventors: Francois Pradere, Robert Frey