Head-up displays (HUDs) are used in aircraft to overlay relevant flight information on the vehicle’s externals for pilots to view with continued focus on the far field. In these systems, the field of view (FOV) is traditionally limited by the size of the projection optics. Though classical HUD systems take a significant amount of space in the flight deck, they have become a necessity in avionic transportation. Our research aims to reduce the size of the HUD footprint while offering a wide FOV projected in the far field with an expanded pupil. This has been accomplished by coupling the image-bearing light into a waveguide under total internal reflection conditions, redirecting that light in the orthogonal direction, and then outcoupling the light toward the pilot. Each step was achieved using holographic optical elements. The injection hologram has optical power to obtain longitudinal magnification, whereas the redirection hologram expands the pupil in one dimension and the extraction hologram expands the pupil in a second dimension. Varying diffraction efficiency along the direction of the light propagation ensures even image intensity throughout the expanded pupil. We used ray tracing optical simulations to optimize the design of the system and present a fully operational demonstrator of the HUD. This HUD produces an image with a FOV of 24°×12.6° at a viewing distance of 4.5 in. (114 mm) from the waveguide, with infinite longitudinal magnification and 1.9× by 1.6× horizontal and vertical pupil expansion, respectively.

Holographic waveguide head-up display with 2-D pupil expansion and longitudinal image magnification

The first ever dynamic recording of total internal reflection holograms is reported. Investigations are carried out on the diffraction efficiency dependence on the dye concentration, exposure time, spatial frequency of the recorded gratings, and on the polarization dependence of the reconstructed wave.

Dynamic Holograms Based on Total Internal Reflection

A study was made of holograms recorded with a reference wave which experienced total internal reflection at the interface between the recording medium and air. The characteristics of the polarization dependence of the intensity of the reconstructed wave were investigated as a function of the polarization angle in the recording and reconstruction stages, and also as a function of the thickness of the recording medium (As2S3 film).

Total-internal-reflection holograms recorded in thin As2S, films

Influence of light polarization on the diffraction efficiency of TIR holograms

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Influence of light polarization on the diffraction efficiency of TIR holograms