光在各向异性的晶体中传播不产生双折射现象的方向。
在许多情况下，需要确定晶体光轴方向厚度这一重要的物理参数，为此就需要精确测量出晶体的厚度。
In many instances the thickness of the optical axis direction of crystal as a important physical parameter needs to be confirmed, so it is necessary to accurately measure the crystal thickness.
运用折射率椭球分析晶体的弹光效应，给出了三方晶系沿光轴方向的应力与折射率的变化关系。
The relation between the stress along the optical axis of trigonal crystallographic system and the refractive index is established.
这个在大光轴角厚晶体上进行定向的方法是方便、快速和有效的。
It is shown that this orientation method for crystals with large optical Angle is convenient, best and valid.
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