This can be explained as the result of interaction between the polarization electrical field of extraordinary phonon and the strong space charge field forming after photo-induced refractive index change in the crystals. 这可以由异常声子的极化电场与光折变在晶体中形成的强空间电荷场的相互作用来解释。
The extraordinary ray neither obeys the refractive law, nor has certain index of refraction in nonisotropic medium. 非常光线在各向异性媒质中传播不遵从折射定律,亦无确定的折射率。