Novel optical photorefractive storage-retrieval system using speckle coding technique in beam-fanning geometry

Abstract An encoding technique based on speckle random patterns as carrier together with the beam-fanning concept is introduced to realize photo-refractive optical volume holographic memory. The set-up is based on beam-fanning geometry employing a single input beam in a BaTiO3 crystal. Retrieval of information from this kind of memory system is very sensitive to code matching. Therefore, in the case of multiple storage, the cross-talk is minimized. The preliminary experimental results are presented with their possible applications in increasing the information storage capacity of volume holographic memories, with resultant reduced cross-talk. A dual-channel optical processor has also been realized wherein object information together with its contrast reversed version are obtained at the output channels simultaneously.