CPC G02B 27/0172 (2013.01) [G02B 6/34 (2013.01); G02B 27/0176 (2013.01); G02B 2027/0178 (2013.01)] | 20 Claims |
1. An optical waveguide comprising:
a substrate configured to guide light coupled into the waveguide within the waveguide via total internal reflection; and
a blazed diffraction grating formed in the substrate or in a layer disposed over the substrate,
wherein the blazed diffraction grating has a first diffraction efficiency across a visible light spectrum for a first polarization over a range of angles for light incident thereon and has a second diffraction efficiency across the visible light spectrum for a second polarization over the range of angles for light incident thereon, the first diffraction efficiency being between 1 and 2 times the second diffraction efficiency.
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