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Duplication of phase key for random-phase-encrypted volume holograms

Wei-Chia Su, Ching-Cherng Sun, Yu-Cheng Chen, and Yueh Ouyang

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Abstract

Holographic memory encrypted by an optical random-phase key and decrypted by either the original phase key or a duplicate key is proposed and demonstrated. The duplicate key is made by recording the encryption wave front with angle multiplexing during writing of the hologram. The amount of three-dimensional shifting that is tolerable in the duplicate key is analyzed.

© 2004 Optical Society of America

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