Multilayer Holographic Storage Using Coaxial Optical Systems

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We propose the multilayer recording of shift-multiplexed holograms with a coaxial transmission-type configuration, which can effectively utilize the recording medium in the thickness direction. In this method, two shift-multiplexing layers are formed in a single recording layer, in which the focal point of the Fourier transform lens lies in two interfaces between the recording material and the substrates. We confirmed experimentally that this dual-focusing method improved the error rate of the data by one order of magnitude. Furthermore, four-layer recording in a double-layered medium was successfully demonstrated, which enabled the areal data density to increase by a factor of four.
2008-07-25