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本文对光折变晶体的衍射效率进行了理论性的分析研究，并以晶体Ce：KNSBN（含锗的钾钠锐酸锶钡）为对象进行了实验上的探索．证实其光生载流子的迁移机制在空间电荷场形成过程中以扩散为主．
In this paper, the diffraction efficiency of photorefractive crystal has been theoretically analyzed and studied. Ce: KNSBN (germanium-containing potassium-sodium barium strontium barrionate) has been investigated experimentally. It is confirmed that the migration mechanism of photo-generated carriers is dominated by diffusion in the formation of space charge field.