Augmented Reality Waveguides

Surface relief waveguides for AR are see-through waveguides, typically on high-refractive index glass. The waveguide includes surface relief gratings for in-coupling of the image signal from a projector, expansion in x and y, and out-coupling.

Typically, blazed and slanted gratings are used for the coupling of light into the waveguide, and binary and slanted gratings are used for the pupil expansion and the out-coupling of the light.