Abstract: Systems, devices, and methods for eyebox expansion in wearable heads-up display are described. The eyebox of a wearable heads-up display may be expanded by increasing the bandwidth of the hologram comprising the holographic combiner of the wearable heads-up display. The bandwidth of the hologram may be increased by physically coupling a donor film to a hologram film, causing donor material to diffuse into the hologram film and then fixing the donor material in place. Diffusion of donor material into the hologram film causes a change in the slant angle and/or the spacing of at least a portion of the hologram fringes of the hologram film, broadening the bandwidth of the hologram.

Abstract: Systems, devices, and methods for controlled hologram playback shifting are described. The playback of a hologram may be shifted to a longer wavelength by diffusing donor material into the hologram in a controlled manner. A hologram may include a set of fringes, holographic recording medium and donor material. An apparatus to controllable shift playback angle of a hologram can include a hologram film holder, donor film holder, one or more light sources, light sensor, and curing lamp. A method may include monitoring playback light until an amount of playback shift occurs, and in response fixing a piece of hologram film and physically de-coupling a donor film therefrom.

Abstract: Systems, devices, and methods for eyebox expansion in wearable heads-up display are described. The eyebox of a wearable heads-up display may be expanded by increasing the bandwidth of the hologram comprising the holographic combiner of the wearable heads-up display. The bandwidth of the hologram may be increased by physically coupling a donor film to a hologram film, causing donor material to diffuse into the hologram film and then fixing the donor material in place. Diffusion of donor material into the hologram film causes a change in the slant angle and/or the spacing of at least a portion of the hologram fringes of the hologram film, broadening the bandwidth of the hologram.