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BEAM EXPANSION WITH THREE-DIMENSIONAL DIFFRACTIVE ELEMENTS

  • US 20100284085A1
  • Filed: 09/28/2006
  • Published: 11/11/2010
  • Est. Priority Date: 09/28/2006
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a substrate made of an optical material having a first surface and a second surface; and

    a three-dimensional diffractive element comprising a plurality of pixels disposed on the substrate, said three-dimensional diffractive element comprises;

    at least one area configured to receive an input optical beam, andat least one further area configured to provide at least one output opticalbeam with an exit pupil expanded in one or two dimensions,wherein at least part of the input optical beam is diffracted in said at least one area to provide at least one optical beam substantially within the first and second surfaces, andat least part of the at least one optical beam is further coupled out of the first or the second surface of the substrate by diffraction in said at least one further area to provide said at least one output optical beam.

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