Waveguide grating device
First Claim
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1. An optical waveguide comprising:
- first and second gratings;
wherein said first grating is configured to diffract an incident light ray coupled into said waveguide as a diffracted ray in a first angular range at least twice and deflect the diffracted ray into a first propagation direction, wherein each diffraction provides a unique diffraction efficiency versus angle characteristic along said first propagation direction,wherein said second grating is configured to diffract the incident light ray coupled into said waveguide as a diffracted ray in a second angular range at least twice and deflect the diffracted ray into a second propagation direction, wherein each diffraction provides a unique diffraction efficiency versus angle characteristic along said second propagation direction,wherein in each of said first and second gratings, said diffracted rays and the corresponding incident ray lie on a diffraction cone of said first or second grating,wherein said first and second gratings provide beam expansion and extract input light from said waveguide.
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Abstract
An optical waveguide comprises at least two TIR surface and contains a grating. Input TIR light with a first angular range along a first propagation direction undergoes at least two diffractions at the grating. Each diffraction directs light into a unique TIR angular range along a second propagation direction.
1435 Citations
19 Claims
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1. An optical waveguide comprising:
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first and second gratings; wherein said first grating is configured to diffract an incident light ray coupled into said waveguide as a diffracted ray in a first angular range at least twice and deflect the diffracted ray into a first propagation direction, wherein each diffraction provides a unique diffraction efficiency versus angle characteristic along said first propagation direction, wherein said second grating is configured to diffract the incident light ray coupled into said waveguide as a diffracted ray in a second angular range at least twice and deflect the diffracted ray into a second propagation direction, wherein each diffraction provides a unique diffraction efficiency versus angle characteristic along said second propagation direction, wherein in each of said first and second gratings, said diffracted rays and the corresponding incident ray lie on a diffraction cone of said first or second grating, wherein said first and second gratings provide beam expansion and extract input light from said waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification