Patent ID: 9746688
Date: 2017-08-29
CPC Classifications: G02B,G02F,G03B,G03H

Claim:
1. An ESBG despeckler device comprising: at least one ESBG element sandwiched between transparent substrates, each said ESBG element comprising a multiplicity of ESBG pixels disposed in a layer; transparent conductive coatings applied to each said substrate, at least one of said coatings being patterned into independently addressable elements overlapping said pixels; an electrical control circuit operative to apply voltages across each said pixel; a first light coupling element disposed adjacent to one of said substrates for diverting input light from an external light source into a total internal reflection illumination path within said substrates; and a second light coupling element disposed adjacent to one of said substrates for diverting light in said total internal reflection illumination path out of said ESBG despeckler device, wherein said at least one ESBG element is disposed along said illumination path, wherein each said ESBG pixel has a first unique speckle state under said first applied voltage and a second unique speckle state under said second applied voltage, wherein said light undergoes at least one total internal reflection within each said substrate and undergoes diffraction by more than one said ESBG pixels along its optical path between said first light coupling element and said second light coupling element.