Beyond volume holographic storage: applications of phase-coded multiplexing to image processing and encryption
Cornelia Denz, Kai-Oliver Mueller, Franz Visinka, Gernot Berger, Theo T. Tschudi · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2000
We present several encryption techniques for holographic data storage, using orthogonal phase-code multiplexing and random phase encoding. Our system is capable of storing page-oriented data based on the selectivity of orthogonal phase-codes in a photorefractive LiNbO3 storage crystal. In order to encrypt data, random phase multiplexing is added to the system. We proof that the combination of deterministic and random phase code multiplexing is possible with low cross-talk and take advantage of this technique for an extremely secure data encryption. Moreover, the potential of phase-code multiplexing to realize arithmetic operations is exploited for data encryption purposes.