减小Ｃｅ：Ｆｅ：ＬｉＮｂＯ３晶片的厚度，扩大泵浦光束直径，由于光爬行效应晶体产生衍射自增强。单光束辐照Ｃｅ：Ｆｅ：ＬｉＮｂＯ３晶体时，出现变偏振现象（ｏ光变ｅ光，ｅ光变ｏ光）等各向异性自衍射。本文对上述现象的形成机理进行了探讨。 Decreasing the thickness of the Ce: Fe: LiNbO3 wafer, expanding the pump beam diameter, due to the optical creep effect of the crystal diffraction self-enhancement. Single-beam irradiation of Ce: Fe: LiNbO3 crystals, the phenomenon of variable polarization (o light to e light, e light to o light) and other anisotropic self-diffraction. This paper discusses the formation mechanism of the above phenomenon.