COMPACT, INTEGRATED DYNAMIC HOLOGRAPHIC MEMORY WITH REFRESHED HOLOGRAMS

An innovative architecture for compact, integrated volume holographic memories is described. It is based on phase-conjugate readout and on a modulator-detector-memory array implemented in a silicon integrated c ircuit. The lensless memory module sustains dynamic read-write hologra ms by periodic refreshing. The integrated circuit is described and exp erimentally characterized. Holograms were stored in a prototype storag e module that uses a 30 degrees-cut BaTiO3 crystal and the 90 degrees recording geometry. As many as three angularly multiplexed holograms w ere periodically refreshed and subjected to >40% decay from exposure t o the reference beam over 50 to 100 cycles. Experimental data are pres ented. (C) 1997 Optical Society of America.