Waveguide grating with spatial variation of optical phase
First Claim
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1. An optical waveguide comprising:
- a plate of transparent material comprising opposed first and second surfaces for guiding an optical beam therebetween by at least one of reflection or diffraction; and
a first diffraction grating at the first surface for spreading the optical beam by diffracting portions thereof into a non-zero diffraction order to propagate inside the plate;
wherein the first diffraction grating comprises an array of grooves running parallel to one another and meandering in a plane of the first diffraction grating to provide a spatial variation of optical phase of the portions of the optical beam diffracted by the first diffraction grating into the non-zero diffraction order.
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Abstract
An optical waveguide is disclosed. The optical waveguide includes a plate of transparent material comprising opposed first and second surfaces for guiding an optical beam between the surfaces by at least one of reflection or diffraction. A diffraction grating is disposed at the first surface for spreading the optical beam by diffracting portions thereof into a non-zero diffraction order to propagate inside the plate. The first diffraction grating includes an array of parallel grooves structured to provide a spatial variation of optical phase of the portions of the optical beam diffracted by the first diffraction grating into the non-zero diffraction order.
9 Citations
18 Claims
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1. An optical waveguide comprising:
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a plate of transparent material comprising opposed first and second surfaces for guiding an optical beam therebetween by at least one of reflection or diffraction; and a first diffraction grating at the first surface for spreading the optical beam by diffracting portions thereof into a non-zero diffraction order to propagate inside the plate; wherein the first diffraction grating comprises an array of grooves running parallel to one another and meandering in a plane of the first diffraction grating to provide a spatial variation of optical phase of the portions of the optical beam diffracted by the first diffraction grating into the non-zero diffraction order. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for reducing a spatial variation of throughput of an optical waveguide comprising a plate of transparent material having opposed first and second surfaces for guiding an optical beam therebetween by at least one of reflection or diffraction, the method comprising:
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providing a first diffraction grating at the first surface of the plate, for spreading the optical beam by diffracting portions thereof into a non-zero diffraction order to propagate inside the plate; wherein the first diffraction grating comprises an array of grooves running parallel to one another and meandering in a plane of the first diffraction grating to provide a spatial variation of optical phase of the portions of the optical beam diffracted by the first diffraction grating into the non-zero diffraction order. - View Dependent Claims (17, 18)
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Specification