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各向异性透明晶体如方解石、石英等的折射率，是其固有的特性，称为永久双折射。The polarization dependence in the refractive index can have a range of outcomes, a few of that happen to be really essential in nonlinear optics and laser technologies:直光纤只有很小的随机双折射，即使这样其中的光传�