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基于晶体中线性偏振波的耦合波理论以及光折变效应的能带传输模型，求出了体全息存储系统中光折变晶体动态范围的解析表达式。以ＬｉＮｂＯ３Ｆｅ和ＢａＴｉＯ３晶体为例，讨论了读写光束与晶体作用的几何结构形式、晶体掺杂量大小及其氧化还原状态等因素对动态范围的影响。研究发现，对两种晶体来说，掺杂浓度越大、氧化程度越深，则可获得的动态范围越大。在ＢａＴｉＯ３晶体中要获得最大动态范围，则光栅矢量与晶轴Ｃ之间的最优夹角应随参考光与信号光之间夹角的不同而不同。
Based on the coupled-wave theory of linearly polarized crystals in the crystal and the energy transfer model of the photorefractive effect, the analytical expression of the dynamic range of the photorefractive crystal in a volume holographic storage system is obtained. Taking the LiNbO3Fe and BaTiO3 crystals as an example, the influence of the geometrical structure of the read / write beam and the crystal, the doping amount of the crystal and the redox state on the dynamic range are discussed. The study found that for both crystals, the greater the doping concentration, the deeper the degree of oxidation, the greater the dynamic range available. In BaTiO3 crystal to get the maximum dynamic range, the optimal angle between the grating vector and the crystal axis C should be different with the angle between the reference light and the signal light.