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Holographic imaging

  • US 5,796,498 A
  • Filed: 09/06/1994
  • Issued: 08/18/1998
  • Est. Priority Date: 02/14/1992
  • Status: Expired due to Term
First Claim
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1. An apparatus for imaging an object obscured by a diffusing medium, comprising:

  • a pulsed laser light source to generate an object beam (3'"'"') and a reference beam (4'"'"') whereby the object (7) obscured by the diffusing medium can be illuminated with the object beam (3'"'"');

    a real time interferogram recording medium (8), comprising a photorefractive medium, arranged to be exposed to, and to record an interferogram formed by the coincidence of light from the object (7) and the reference beam (4'"'"');

    a means for reconstructing an image from the interferogram; and

    a means for recording the image;

    said apparatus including a reference beam path means for guiding the reference beam so that a pulse of the reference beam arrives at the real time interferogram recording medium so as to be coincident with at least one of unscattered light and least scattered light from the object, thereby causing the interferogram recorded to represent the information content contained within the unscattered light or the least scattered light from the object (7).

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