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Two layer optical elements

  • US 6,005,714 A
  • Filed: 12/02/1997
  • Issued: 12/21/1999
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. An optical element formed as a body having two layers, at least one of which is transmissive to a selected wavelength of illumination, the optical element comprising:

  • one layer formed with a first surface relief optical formation as a boundary thereof; and

    the other layer formed on said boundary so as to have an adjacent boundary that is a second surface relief optical formation that is the conjugate of the first surface relief formation, the other layer having further optical features on a surface opposite the adjacent boundary, wherein the first and second surface relief optical formations are diffractive formations and the further optical features includes a third surface relief diffractive optical formation that is a compensated conjugate of the diffractive formations.

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