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Optical waveguide with coherent light source

  • US 10,222,615 B2
  • Filed: 05/26/2017
  • Issued: 03/05/2019
  • Est. Priority Date: 05/26/2017
  • Status: Active Grant
First Claim
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1. An optical waveguide comprising:

  • a front surface;

    a rear surface; and

    a first optical element configured to;

    allow light from a coherent light source to enter the optical waveguide through the front surface, wherein the light has a coherence length, wherein the coherent light source comprises a laser; and

    a second optical element configured to;

    allow a first portion of the light to exit the optical waveguide through the rear surface with a first optical path length; and

    allow a second portion of the light to exit the optical waveguide through the rear surface with a second optical path length, wherein a difference between the first optical path length and the second optical path length is greater than the coherence length.

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