Systems, devices, and methods for controllable hologram playback shifting

An apparatus for controllable shifting of the playback angle of a hologram, the apparatus comprising:

• a hologram film holder arranged to controllably physically couple a hologram film to a donor film, wherein the hologram film holder is transparent;
• a donor film holder arranged to controllably physically couple the donor film to the hologram film;
• a first light source positioned and oriented to illuminate at least a portion of the hologram film when held by the hologram holder with a first beam of incident playback light;
• a first light sensor positioned and oriented to measure an intensity of playback light emanating from the hologram film when held by the hologram film holder;
• and
• a controllable curing lamp positioned and oriented to illuminate the hologram film with light when the hologram film is held by the hologram film holder, wherein the range of wavelengths of light emitted by the curing lamp is different from the range of wavelengths of light emitted by the first light source.

A method for controllable shifting of the playback of holograms, the method comprising:

• physically coupling a donor film to a hologram film, wherein the donor film comprises donor material, the hologram film comprises a hologram, and wherein physically coupling the donor film to the hologram film causes a first amount of donor material to diffuse from the donor film into the hologram film;
• monitoring a playback light of the hologram of the hologram film until a first amount of playback shifting has occurred;
• in response to achieving the first amount of playback shifting:
• fixing the hologram film;
• and
• physically de-coupling the donor film from the hologram film.

An eyeglass lens for use in a wearable heads-up display, the eyeglass lens comprising:

• a hologram comprising:
• a first surface;
• a second surface opposite the first surface;
• and
• a set of fringes disposed between the first surface and the second surface;
• holographic recording medium (“HRM”) material, where the concentration of HRM material is at least approximately constant between the first surface and the second surface;
• and
• donor material, where the concentration of donor material is at least approximately constant between the first surface and the second surface;
• and
• at least one lens portion, wherein each lens portion is physically coupled to the hologram.

A wearable heads-up display (WHUD) with an expanded eyebox, the wearable heads-up display comprising:

• a support structure;
• a projector;
• and
• a transparent combiner positioned and oriented to appear in a field of view of an eye of a user when the support structure is worn on a head of the user, the transparent combiner comprising:
• a hologram comprising:
• a first surface;
• a second surface opposite the first surface;
• and
• a set of fringes disposed between the first surface and the second surface;
• holographic recording medium (“HRM”) material, where the concentration of HRM material is at least approximately constant between the first surface and the second surface;
• and
• donor material, where the concentration of donor material is at least approximately constant between the first surface and the second surface;
• and
• at least one lens portion, wherein each lens portion is physically coupled to the hologram.