Four kinds of lithium niobate crystals doped with Cu:Ce, Mn:Cu:Ce, Mn:Fe, and Mn:Fe:Mg processed under oxidation or reduction conditions were studied experimentally for the photorefractive non-volatile holographic storage with ultraviolet sensitizing and red light recording. It is shown that only highly oxidized crystals are able to realize non-volatile holographic storage. On the condition of non-volatile holographic storage with high signal-to-noise ratio, the non-volatile diffraction efficiency of the oxidized LiNbO_(3):Cu:Ce crystal is the highest among all studied samples, and the recording sensitivity and the dynamic range of the oxidized LiNbO_(3):Mn:Fe crystal are the highest.
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