The decryption of random phase multiplexing encoding system

Hsiao-Yi Lee; Jung-Ping Liu; Chi-Ching Chang; Hon-Fai Yau; Tsung-Chien Chang

doi:10.1117/12.559180

22 October 2004 The decryption of random phase multiplexing encoding system

Hsiao-Yi Lee, Jung-Ping Liu, Chi-Ching Chang, Hon-Fai Yau, Tsung-Chien Chang

Proceedings Volume 5560, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications X; (2004) https://doi.org/10.1117/12.559180
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Random-phase-multiplexing storage using photorefractive crystals is one of the most important topics in the field of photorefractive optics. To achieve random phase recording, we can use a diffuser to encrypt the reference light in a holographic recording setup. To decrypt the recorded pattern, the same diffuser used in encryption must be used in the reconstruction light, and it must be set in the original orientation. In this way, a number of 2-D patterns can be stored in a single photorefractive crystal with a single diffuser set at different orientations for different patterns. A merit in this recording method is that the encryption is virtually not possible to be decrypted if the original diffuser for encrypting is not available. In this paper, we proposed a way to decrypt the encrypted information in a photorefractive lithium niobate crystal without the possession of the original diffuser. In this method, we suppose somehow we know one of the patterns stored in the crystal, and then we retrieve the original diffuser with this pattern. And ultimately all the other patterns stored in the crystal are decrypted and retrieved with this retrieved diffuser.

Citation Download Citation

Hsiao-Yi Lee, Jung-Ping Liu, Chi-Ching Chang, Hon-Fai Yau, and Tsung-Chien Chang "The decryption of random phase multiplexing encoding system", Proc. SPIE 5560, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications X, (22 October 2004); https://doi.org/10.1117/12.559180

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