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利用热膨胀系数张量推导出光学方解石晶体(OCC)的任意方向热膨胀系数的表达式,确定了晶体的零膨胀方向;推导出晶体任意方向双折射率的温度变化量的表达式,并给出晶体中任意方向光程差随温度的变化关系。结果表明,对应方位角为65.35°或114.65°的方向是OCC的零膨胀方向;温度对晶体中光程差的影响随方位角的变化而变化,在垂直于晶体光轴的方向这种影响最大。
The expression of thermal expansion coefficient in any direction of optical calcite crystal (OCC) was deduced by using the thermal expansion coefficient tensor, and the zero expansion direction of the crystal was determined. The expression of the temperature variation of birefringence in any direction of the crystal was deduced, In any direction of optical path difference with temperature changes. The results show that the direction corresponding to the azimuth angle of 65.35 ° or 114.65 ° is the direction of zero expansion of OCC. The influence of temperature on the optical path difference in the crystal changes with the azimuth angle. This effect is most significant in the direction perpendicular to the optical axis of the crystal .