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Edge-illuminated holograms

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Abstract

Hologram displays can be made very compact by utilizing a thick hologram cover plate, a laser diode attached to its edge, and by allowing the laser beam to expand within the cover plate. For improved illumination uniformity, the beam can be reflected or collimated by a mirrored opposite edge of the cover plate. The volume occupied by the display equals the hologram area times the thickness of the cover plate. Light utilization of the display holograms can be increased by recycling the illuminating beam: by letting the undiffracted beam pass through the hologram several times. As HOEs, the edge-illuminated arrangement enables very compact collimator or collector systems. To maintain greater directional accuracy, the holograms can be achromatized to reduce the effects of laser diode wavelength drift.

© 1991 Optical Society of America

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