5 December 2005 Shift selectivity of spatial spread-spectrum holographic recording system
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Proceedings Volume 6050, Optomechatronic Micro/Nano Devices and Components; 605009 (2005) https://doi.org/10.1117/12.641589
Event: Optomechatronic Technologies 2005, 2005, Sapporo, Japan
Abstract
Volume holographic recording is a promising solution for next- generation optical disc storage that has a high capacity more than 1 TB. This huge capacity is achieved by superimposing many holograms, each of which has millions of bits, at the same recording spot. We proposed a new technique, Spatial Spread Spectrum (SSS) multiplex recording. Unlike conventional multiplex holography based on Bragg effect of thick holograms, our technique utilizes spatial phase modulation and demodulation of the signal beam itself with a random diffuser to address the multiplexed page data. SSS multiplexing is additionally combined with other multiplexing methods, and provides further improvement of the total capacity of holographic storage. In this paper we experimentally verify the basic recording and readout feasibility, and investigate the shift selectivity and the aligning margin of the SSS holographic recording that are an important factor to determine the tolerance against vibration. It is shown that a clear 2-dimensional image is successfully reconstructed from the hologram even in the case the central part of the diffused signal beam is blocked in recording, and that a sharp shift selectivity about 5 microns was obtained by a diffuser with a diffusion angle of 15 degree, and the aligning margin for a sufficient SNR was approximately 1 micron.
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Terumasa Ito, Atsushi Okamoto, Masatoshi Bunsen, "Shift selectivity of spatial spread-spectrum holographic recording system", Proc. SPIE 6050, Optomechatronic Micro/Nano Devices and Components, 605009 (5 December 2005); doi: 10.1117/12.641589; https://doi.org/10.1117/12.641589
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