Abstract
The holographic properties of doubly doped lithium niobate crystals with Indium have been investigated. It is found that doping slight Indium concentration (0.5mol%) in LiNbO3:In, Fe crystal can efficiently increase the sensitivity with small dynamic range changing. To improve the whole holographic properties of LiNbO3 crystal, LiNbO3:In, Fe with ideal doping concentrations and a new photorefractive material LiNbO3:In, Mn have been proposed and achieved larger dynamic range, higher sensitivity and better signal-to-noise ratio than LiNbO3:Fe crystal (Fe:0.03wt.%) that is generally considered as a preferable storage medium in holographic memories. In a common volume of LiNbO3:In, Fe crystal proposed, 2030 holograms have been successfully multiplexed and exactly identified in a compact volume holographic data storage and correlation recognition system.
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