US 11,835,746 B2 · Coherent skew mirrors

Abstract

Systems and methods for performing coherent diffraction in an optical device are disclosed. An optical device may include a grating medium with a first hologram having a first grating frequency. A second hologram at least partially overlapping the first hologram may be provided in the grating medium. The second hologram may have a second grating frequency that is different from the first grating frequency. The first and second holograms may be pair-wise coherent with each other. A manufacturing system may be provided that writes the pair-wise coherent holograms in a grating medium using a signal beam and a reference beam. Periscopes may redirect portions of the signal and reference beams towards a partial reflector, which combines the beams and provides the combined beam to a detector. A controller may adjust an effective path length difference between the signal and reference beams based on a measured interference pattern.

Claims16

Dependent claims

A display system configured to display images, the display system comprising:

a waveguide;
a grating medium on the waveguide and configured to receive light that includes at least a portion of the images;
a first hologram in the grating medium, wherein the first hologram has a first grating frequency and is configured to diffract the light as first diffracted light having a first spectral peak, a side-lobe spectral peak, and a spectral null;
and
a second hologram in the grating medium, wherein the second hologram has a second grating frequency that is different from the first grating frequency, the second hologram is configured to diffract the light as second diffracted light having a second spectral peak, the second diffracted light has a side-lobe spectral null overlapping the side-lobe spectral peak of the first diffracted light, and the second spectral peak of the second diffracted light overlaps the spectral null of the first diffracted light.

2 more elements

Dependencies are inferred from the claim text.

Coherent skew mirrors

Life of this patent

Coherent skew mirrors

Life of this patent

Abstract

Claims16