Laser illumination device
First Claim
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1. An optical device comprising:
- a light guiding structure;
a source of light optically coupled to said light guiding structure and configured to emit at least first and second wavelength collimated light color sequentially;
a first ESBG element comprising a first multiplicity of ESBG pixels for diffracting said first wavelength light out of said light guiding structure into a first set of output paths; and
a second ESBG element comprising a second multiplicity ESBG pixels for diffracting said second wavelength light out of said light guiding structure into a second set of output paths substantially overlapping said first set of output paths,wherein said first and second multiplicity of ESBG pixels are formed in at least one layer disposed within said light guiding structure,wherein pixels of said first multiplicity are configured to switch into a diffracting state when said source emits said first wavelength light and pixels of said second multiplicity are configured to switch into a diffracting state when said source emits said second wavelength light.
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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.
1326 Citations
20 Claims
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1. An optical device comprising:
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a light guiding structure; a source of light optically coupled to said light guiding structure and configured to emit at least first and second wavelength collimated light color sequentially; a first ESBG element comprising a first multiplicity of ESBG pixels for diffracting said first wavelength light out of said light guiding structure into a first set of output paths; and a second ESBG element comprising a second multiplicity ESBG pixels for diffracting said second wavelength light out of said light guiding structure into a second set of output paths substantially overlapping said first set of output paths, wherein said first and second multiplicity of ESBG pixels are formed in at least one layer disposed within said light guiding structure, wherein pixels of said first multiplicity are configured to switch into a diffracting state when said source emits said first wavelength light and pixels of said second multiplicity are configured to switch into a diffracting state when said source emits said second wavelength light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification