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Holographic elements for an optical recording system

DC
  • US 5,450,378 A
  • Filed: 11/08/1993
  • Issued: 09/12/1995
  • Est. Priority Date: 10/25/1991
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling at least one beam of light in an optical data storage system comprising:

  • a) a light source; and

    b) a multi-function volume holographic optical element (HOE) in a raypath of light from said light source, said holographic optical element adapted to perform a plurality of optical functions selected from the group of generating servo error signals, generating a focus error signal, generating a tracking error signal, collimation, beam shaping, beam splitting, and combining at least two beams.

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