Abstract

We propose a novel random phase-coded multiplexing for encrypting holographic memory in a photorefractive LiNbO₃:Fe crystal. A rotating and shifting circular holographic diffuser is placed as a random-phase modulator in the reference beam to provide a simple yet effective method of increasing the holographic memory capabilities of the crystal. Experiments show that the angular selectivity of the rotational multiplexing experienced produces a significant increase when a larger holographic diffuser scattering angle is implemented. The proposed multiplexing scheme can also be combined with angular multiplexing to produce angular-rotational random phase-coded multiplexing, offering not only further memory possibilities but data encryption capabilities as well.

© 2001 Optical Society of America