The extinction ratio of colored calcite crystal polarizer can reach 10-6. It can be used in optical measurement systems which doesn't need extreme high precision.
有色方解石晶体偏光器件的消光比可达10 - 6量级，能满足一般光学测试系统的使用要求。
The main refractive indices of calcite crystal are measured by the means of auto-collimation, and the thermo-optical coefficients are calculated.
用自准直方法测量了冰洲石晶体的主折射率并计算出了折射率温度系数。
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