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。

为了更好地利用有色方解石晶体，采用X射线荧光光谱仪和X射线衍射仪等仪器对浅黄色和浅紫色方解石成分进行了测试分析，用分光光度计测试了黄色方解石的透射光谱。浅黄色方解石中含有微量的镁元素和锶元素，浅紫色方解石中含有微量的锰、锶和镁元素，有色方解石晶体偏光器件的消光比可达10^－6量级。结果表明，有色方解石晶体偏光器件能满足一般光学测试系统的使用要求。

The factor group symmetry analysis (FSA) method and position symmetry analysis (PSA) method are used to analyze the vibrational modes of calcite (CaCO3) crystal, respectively. With the activated results of infrared and Raman spectra presented, strong points of each method are concluded. The infrared spectra are studied by using dynamics calculations based on density-functional theory (DFT) with the supercell model of calcite crystal. The frequencies of 27 normal modes are achieved, which are consistent with that by the group symmetry analysis very well, and fit with the experimental results better than the lattice dynamical methods.