Patents by Inventor Haim M. Haskal

Haim M. Haskal 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).

  • Patent number: 6023352
    Abstract: The invention features methods and systems for thermally fixing or erasing a laser-induced hologram in a photorefractive material, for example, by directing laser radiation having a wavelength through a thickness of the photorefractive material containing the hologram, wherein the wavelength is selected such that the photorefractive material absorbs a portion of the laser radiation and transmits another portion of the laser radiation. The transmitted laser radiation can be redirected back through the hologram, wherein both the laser radiation directed and redirected to the hologram are sufficiently absorbed by the photorefractive material to thermally fix or erase the hologram.
    Type: Grant
    Filed: August 11, 1998
    Date of Patent: February 8, 2000
    Assignee: University of Massachusetts
    Inventor: Haim M. Haskal
  • Patent number: 4514047
    Abstract: A quarterwave retarder prism such as can be used in optical recording has a shape similar to a dove prism, and has three internal reflections, with the retarder prism designed to have the emerging light beam on the same axis or collinear with the entering light beam such that the accumulated phase retardation in the device is one quarterwave over a wide range of wavelengths of light.
    Type: Grant
    Filed: October 12, 1982
    Date of Patent: April 30, 1985
    Assignee: Magnetic Peripherals Inc.
    Inventors: Haim M. Haskal, Robert A. Briones