Chi Ching CHANG^*, Gu Liang CHEN¹, Wen Kuei YOUNG¹, Ching Yang LIN², and Hon Fai YAU²

Department of Computer Science and Information Engineering, Ming Dao University, Peetow, Chunghua 52345, Taiwan, R.O.C.
¹School of Defense Science, National Defense University, Tashi, Taoyuan 33509, Taiwan, R.O.C.
²Department of Optics and Photonics, National Central University, Chungli, Taoyuan 33201, Taiwan, R.O.C.

(Received February 1, 2007; Accepted May 28, 2007)

This work presents a novel optical holographic encrypted data storage approach based on a phase encoding multiplexed scheme. In the proposed data storage scheme, patterns to be encrypted are stored holographically in a photorefractive LiNbO₃:Fe crystal using a lenticular lens array (LLA) sheet phase-encoded multiplexing. Experimental results reveal that rotating an LLA placed as a phase modulator in the path of the reference beam is a simple but effective method of increasing the phase addresses for holographic memory in a crystal. Combining this rotational multiplexing with two-axis rotating multiplexing provides further data storage and data encryption capacity.

Key words: data storage, phase encoding, lenticular lens array, encryption, holographic memory

^*E-mail address: chichang@mdu.edu.tw