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Reversible hologram fixation in photorefractive materials using incoherent ultraviolet light
Reversible hologram fixation in photorefractive materials using incoherent ultraviolet light
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机译:非相干紫外光可逆全息图固定在光折变材料中
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摘要
A holographic information storage and retrieval system provides an all-optical reversible method to fix information in doped or undoped photorefractive materials. The fixed information is sufficiently stable to provide long term archival storage over a period of decades or more and can be read out non-destructively by a coherent reference beam. Holograms recorded in a photorefractive material are fixed when the material is irradiated with incoherent ultraviolet light. Hence, the holograms are preserved indefinitely against erasure by a coherent beam and against dissipation in dark storage. Holograms, which are fixed in the photorefractive material with incoherent ultraviolet light, are. also erased with incoherent ultraviolet light, thus making the process reversible.
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