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17 June 2004 Hologram multiplexing method with photorefractive beam-fanning speckle
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The volume holographic data storage has been attractive because of its large capacity due to the three-dimensional recording and the fast data transfer rate due to the two-dimensional retrieving. Among various holographic storage media, photorefractive crystals are expected because of rewritability. To enhance the storage density, several multiplexing techniques have already been suggested. Especially, the speckle multiplexing technique allows the easy implementation of the hologram multiplexing by the simple optical setup, in which only a diffuser such as the ground glass or the multimode optical fiber is embedded to generate the deterministic speckle-encoded reference beam. In this paper, we propose a hologram multiplexing method with the reference beam speckled by the photorefractive beam-fanning effect. Compared with the conventional speckle multiplexing method, this method realizes the facile implementation of the speckle multiplexing with the simple and compact optical setup because the external apparatus for generating the speckled reference beam is not required. A bulk photorefractive crystal takes the role of generating various speckle fields as well as storing holograms. All-optically controlled hologram multiplexing and retrieving would also be realized because the beam-fanning effect can be controlled only by light. We demonstrate the hologram multiplexing and the selective retrieving with the speckled reference beam generated by the beam-fanning effect in a photorefractive BaTiO3 crystal. The speckle field of the reference beam to record multiple holograms is varied by changing the boundary condition of the incident beam such as the incident position and the spatial phase distribution. We can successfully reconstruct the desired image from four multiplexed holograms with the reference beam speckled by the photorefractive beam-fanning effect in both procedures.
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Masatoshi Bunsen and Atsushi Okamoto "Hologram multiplexing method with photorefractive beam-fanning speckle", Proc. SPIE 5362, Advanced Optical and Quantum Memories and Computing, (17 June 2004);

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