Terabyte Holographic Memory.

This report results from a contract tasking A. F. Loffe Physical Technical Institute as follows Topic description The following problems have been studied 1 Spectral selectivity and multiplexing in volume holograms recorded in photorefractive materials. 2 Electric field multiplexing when recording and retrieving information in volume holograms having an external electric field. 3 Analysis of cross talk and optical scattering in photorefractive materials that limit the maximum information capacity in volume holograms using spectral and electric field multiplexing. The main results of the investigation are 1 The main limiting factors on the magnitude of the electric field multiplexing are inhomogeneity of the electric field in the crystal the presence of the ordinary polarization in the illuminating light during readout of holograms the magnitude of the breakdown in the electric field. 2 It was shown that the non-ideal coherence of the laser light used for hologram readout can play a very important role in cross talk in spectral multiplexing. The experiment showed high selectivity of volume holograms in LiNbO sub 3 have been carried out and validated the theoretical analysis. 3 A draft of a holographic memory system with a 1 Terabyte capacity has been proposed.