22 November 1999 Reversible all-optical information fixing for commercial holographic memories
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Abstract
I pioneered the use of incoherent ultraviolet light to fix holograms in photorefractive materials. I discovered a reversible hologram fixing process that eliminates hologram erasure during readout and dark decay in photorefractive materials. Holograms fixed with this process are read out indefinitely with high and constant diffraction efficiency and do not exhibit any apparent dark decay. Thus, information stored in a photorefractive material is always retrieved without any loss in quality and is preserved in the material without any degradation. Plane wave holograms were fixed in lithium niobate with incoherent ultraviolet light. The holograms exhibited high and constant diffraction efficiency when they were read out continuously for many hours with the reference beam and did not register any apparent dark decay for over a year. The fixed holograms were erased with incoherent ultraviolet light, thus making this all-optical hologram fixing process reversible.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Adil Lahrichi, Adil Lahrichi, } "Reversible all-optical information fixing for commercial holographic memories", Proc. SPIE 3802, Advanced Optical Data Storage: Materials, Systems, and Interfaces to Computers, (22 November 1999); doi: 10.1117/12.370242; https://doi.org/10.1117/12.370242
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