Optical systems with holographic elements for producing uniform images

Abstract

An electronic device may provide images to an eye box. The device may include first and second sets of holograms that sequentially diffract light along an optical path. Each hologram in the first set may have a respective grating vector oriented along a common axis. Each of the grating vectors may have a respective magnitude. The magnitudes may be non-uniformly spaced across the first set of volume holograms. Similarly, each hologram in the second set may have a respective additional grating vector oriented along an additional common axis. Each of the additional grating vectors may have a respective additional magnitude. The additional magnitudes may be non-uniformly spaced across the second set of holograms. This may serve to produce diffracted light within filaments of k-space that mitigate angular harmonic sight lines in angle space, thereby preventing formation of non-uniformities in the images at the eye box.