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Diffractive optical element using polarization rotation grating for in-coupling

  • US 10,073,278 B2
  • Filed: 08/27/2015
  • Issued: 09/11/2018
  • Est. Priority Date: 08/27/2015
  • Status: Active Grant
First Claim
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1. An optical system, comprising:

  • a substrate of optical material;

    a first diffractive optical element (DOE) disposed on the substrate, the first DOE having an input surface and configured as an in-coupling grating to receive one or more optical beams as an input; and

    a second DOE disposed on the substrate and configured for pupil expansion of the one or more optical beams along a first direction,wherein a first portion of the first DOE is configured with a polarization rotating grating and a second portion of the first DOE is configured without a polarization rotating grating, wherein the first and second portions are configured to combine respectively received beams to generate a combined beam.

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