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Systems and methods for optical systems with exit pupil expander

  • US 10,481,399 B2
  • Filed: 09/20/2017
  • Issued: 11/19/2019
  • Est. Priority Date: 09/21/2016
  • Status: Active Grant
First Claim
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1. An optical system comprising:

  • an image projection system, the image projection system configured to emit a coherent beam of light at a plurality of wavelengths in the visible spectral range;

    a waveguide comprising a first edge, a second edge and a pair of reflective surfaces disposed between the first and the second edges, the pair of reflective surfaces separated by a gap having a gap height d, the waveguide comprising a material having a refractive index n, the pair of reflective surfaces having a reflectivity r, the beam emitted from the image projection system being coupled into the waveguide at an input angle θ

    ; and

    a control system configured to vary at least one parameter selected from the group consisting of;

    a wavelength from the plurality of wavelengths, the gap height d, the refractive index n and the reflectivity r, wherein the variation of the at least one parameter is correlated with variation in the input angle θ

    such that the equation 2nd sin θ

    =mλ

    is satisfied for values of the input angle θ

    , wherein m is an integer and λ

    is wavelength of the beam.

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