Removable fieldstone security key used in random pattern optical multiple recording

We proposed a simple and compact rewritable holographic memory system using a fieldstone of Ulexite. The role of the fieldstone is to impose random patterns on the reference beam to record plural images with the random-reference multiplexing scheme. The operations for writing and reading holograms are carried out by simply rotating the fieldstone in one direction. In this paper, we report on of a numerical simulation of the correlative value of reference patterns to record and readout and the experimental examination of the intensity of the readout images.