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Anisotropic leaky-mode modulator for holographic video displays

  • US 10,108,146 B2
  • Filed: 03/14/2014
  • Issued: 10/23/2018
  • Est. Priority Date: 08/11/2007
  • Status: Active Grant
First Claim
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1. An anisotropic spatial acousto-optic modulator for a holographic display system, the modulator having an input end and an output end, the modulator comprising:

  • a substrate;

    an anisotropic waveguide residing on the substrate, the waveguide being configured to guide light entering the modulator at the input end into a single polarization, the waveguide having a material composition and structure that can propagate at least red, green, and blue wavelengths of light without damage to the modulator; and

    at least one transducer disposed at or near the output end of the modulator, the at least one transducer being placed and configured to generate surface acoustic waves that propagate linearly with the guided, polarized light in the anisotropic waveguide, thereby creating a diffraction grating that converts at least some of the polarized light into a leaky mode of orthogonal polarized light at the modulator output end,wherein the modulator is edge-lit such that light is coupled into the modulator at an angle nearly collinear to the diffraction grating, and wherein the leaky mode of orthogonal polarized light exiting the modulator is scanned at an angle from the output end of the modulator into an optical path of the holographic display system for viewing at an angle that is nearly collinear to the diffraction grating.

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