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通过分析波矢沿任意方向的单轴晶体的折射率,在光轴位于入射面内时,给出了入射光分别为s光和p光的反射率拟合函数。利用改进的反射率扫描仪,测量了CaCO3晶体的s光和p光反射率随入射角变化情况,由理论拟合获得单轴晶体的两个主折射率,分别为no=1.6559和ne=1.4851。这种方法不需要对样品进行加工,其精度达到0.0001。另外,对于晶体光轴未知的情况,采用改进的布儒斯特技术分别测出三个晶体表面的布儒斯特角,由此可以确定光轴的方向。
By analyzing the refractive index of uniaxial crystal in any direction of wave vector, the fitting function of reflectivity of incident light, s light and p light respectively, is given when the optical axis is in the incident plane. Using the improved reflectance scanner, the s-light and p-light reflectivity of CaCO3 crystals were measured with the incident angle. The two principal refractivities of uniaxial crystals were obtained by theoretical fitting, respectively being no = 1.6559 and ne = 1.4851 . This method does not require sample processing, the accuracy of 0.0001. In addition, the direction of the optical axis can be determined by using the improved Brewster technique to measure the Brewster angles of the three crystal surfaces respectively for unknown optical axes.