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Holographic exposure system for computer generated holograms

  • US 4,960,311 A
  • Filed: 08/31/1989
  • Issued: 10/02/1990
  • Est. Priority Date: 08/31/1989
  • Status: Expired due to Term
First Claim
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1. A system for exposing a recording medium with a computer generated diffraction grating which exhibits multiple order scattering noise when illuminated comprising:

  • a point source of illumination positioned to direct light at the diffraction grating for exposing the recording medium;

    means for relatively moving the point source during the exposure to reduce the multiple order scattering noise;

    means for interacting with the point source to form a desired interference pattern; and

    means for varying the wavelength of the point source to compensate for any variation in formation of fringe spacing in the recorded interference pattern.

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