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Storage capacity and cross talk in angularly multiplexed holograms: two case studies

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Abstract

Storage capacity of a volume is derived based on the space–bandwidth products of angularly multiplexed holograms and by considering their diffraction efficiency and cross-talk limitations. An erasable medium of Fe:LiNbO3 (10 mm × 10 mm × 2 mm) is simulated that yields a capacity of ~26 Gbits for 95 holograms, each with an efficiency of ~10−4, for a total of ~ −31-dB cross talk. The recording time is estimated at 0.7 s (assuming 103 W/m2 and λ = 0.5 μm). A nonerasable dichromated gelatin medium 10 mm × 10 mm × 0.025 mm is also analyzed that yields a capacity of ~3.3 Gbits for 11 holograms with efficiency of 0.09 and ~ −25-dB cross talk.

© 1993 Optical Society of America

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