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Optics Letters

Fast update of dynamic photorefractive optical memory

Hironori Sasaki, Yoshinao Taketomi, Jian Ma, Yeshaiahu Fainman, Sing H. Lee

Published Oct 15, 1992• 35 citations
Publisher

Abstract

We have analyzed the dynamics of the selective erasure process in photorefractive crystal. The selective erasure process is much faster than the incoherent erasure process. Experimental results show good agreement with theoretical prediction. We have applied the incremental recording schedule and selective erasure process to a dynamic photorefractive optical memory and experimentally demonstrated the robust readout and fast update capabilities.

DOI
10.1364/ol.17.001468

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We have analyzed the dynamics of the selective erasure process in photorefractive crystal. The selective erasure process is much faster than the incoherent erasure process. Experimental results show good agreement with theoretical prediction. We have applied the incremental recording schedule and selective erasure process to a dynamic photorefractive optical memory and experimentally demonstrated the robust readout and fast update capabilities.
A theoretical analysis for the optimization of the selective-erasure process in holographic photorefractive memories is presented. It is based on the solution of the standard material equations under a linear approximation (low modulation depths). Specific expressions for the optimum phase shifts and erasure rates are obtained. The approach includes all transport processes and so applies to photovoltaic materials such as LiNbO3. The different behavior with regard to nonphotovoltaic materials is discussed. Some additional strategies to improve the overall erasure process are proposed.
The speed of modern supercomputers is primarily limited by the relatively slow speed of memory. Research over the past years has focused on developing optical memory systems that, by nature of optics, promise to achieve high speed and high memory capacity. Three- dimensional optical memory systems are well known for their storage capacity and achievable short access time. But the early attempts to exploit 3-dimensional media were limited to photorefractive crystals such as lithium niobate, due to the unavailability of any other suitable medium (alternative media are precluded by their diffraction limited storage densities and non- erasable characteristics). Although volume phase holograms can be recorded in photorefractive crystals, these materials have many obvious flaws such as strong scattering, phase distortion, self diffraction, fast decay, and low refractive index modulation. There have also been continuous efforts to develop new 3-D media (such as photon echo, photorefractive polymers, bacteriorhodusphin, memory access cache, etc., but none can be applied in real world 3-D device because these materials are still in the early stage of development.