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US 8,565,560 B2Granted
Laser illumination device
AssigneeSBG Labs, Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern, John James Storey
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Abstract
An Electrically Switchable Bragg Grating (ESBG) despeckler device comprising at least one ESBG element recorded in a hPDLC sandwiched between transparent substrates to which transparent conductive coatings have been applied. At least one of said coatings is patterned to provide a two-dimensional array of independently switchable ESBG pixels. Each ESBG pixel has a first unique speckle state under said first applied voltage and a second unique speckle state under said second applied voltage.
Claims20
An optical device comprising:
- at least one ESBG element sandwiched between transparent substrates, 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;
- and
- a light coupling element disposed adjacent to one of said substrates for diverting input light from an external light source into a total internal reflection path within said substrates,
- wherein each said pixel is characterized by one of a predefined set of grating vectors,
- wherein each said pixel has one non-diffracting state and at least one diffracting state,
- wherein each said ESBG pixel when in its diffracting state diffracts light out of said total internal reflection path through one of said substrates into one of a predefined set of output light paths.
5 more elements
Dependencies are inferred from the claim text.