17 September 2002 Using speckle to reduce the influence of DPL modes on holographic storage system
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In normal angular multiplexed holographic storage system, to make the system compact, replacing the Ar+ laser with the diode-pumped solid-state laser (DPL) is an important means, but the application of DPL will increase the cross-talk and reduce the storage density because of the multiple longitudinal modes in the output of the DPL. In this paper, a novel speckle holographic storage scheme is proposed, in which a random phase diffuser is added in the front of storage medium along the reference optical path of the 90° geometry. A theoretical model has been derived to describe the storage properties of this scheme based on the cross-correlation of dynamic speckle and the diffractive theory. The angular selectivity in the normal angular multiplexed system and in the speckle-coded angular multiplexed system have been theoretically compared and experimentally confirmed. The results indicate that this scheme allows an increase of storage density with a simple modification in the DPL system.
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Dong Huang, Qingsheng He, Jinnan Wang, Hongzhen Jin, Guofan Jin, "Using speckle to reduce the influence of DPL modes on holographic storage system", Proc. SPIE 4930, Advanced Optical Storage Technology, (17 September 2002); doi: 10.1117/12.483343; https://doi.org/10.1117/12.483343


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