Abstract
We propose a hologram multiplexing method with a speckled reference beam generated by the photorefractive beam-fanning effect. In this method, a bulk photorefractive crystal takes the role of generating various speckle fields as well as storing holograms. The speckle field of a reference beam used for holographic recording is generated by the photorefractive beam-fanning effect in the storage crystal. This speckle field can be changed by varying the spatial intensity distribution, the spatial phase distribution, the incident angle or the incident position of the original reference beam at the crystal surface. We experimentally demonstrate hologram multiplexing and retrieving with the speckled reference beams generated by the beam-fanning effect in a photorefractive BaTiO 3 crystal. Here we vary the speckle field by changing the incident position of the original reference beam. We can successfully reconstruct stored images from four multiplexed holograms with the reference beams speckled by the beam-fanning effect. This method has the great possibility for all-optical control of hologram multiplexing, besides the simplification of an optical system compared with conventional speckle multiplexing methods using external diffusers such as ground glass and multimode optical fiber.
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