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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。Feel free to Speak to us for support. Our expert staff members is barely far too delighted to help you with the decision system.直光纤只有很小的随机双折射，即使这样其中的光传输一段距离后偏振状态也会发生