线偏振光正入射的情况下,格兰-汤普森棱镜的透射光强随入射光方位角的变化出现周期性增强的扰动,影响了透射偏振光的质量。为了尽可能的减小扰动带来的不利影响,以保证棱镜使用过程中透射偏振光的质量,通过对不同温度下扰动因子的变化分析得到了:透射光强对入射角敏感的依赖关系。实验中,格兰-汤普森棱镜的振动引起入射角在棱镜的结构角大小附近作微小变化,从而导致了透射光强的扰动,选取合适的结构角可以减小扰动。对于特定波长的入射光而言,应在允许范围内尽量减小胶合层厚度;当温度在一定范围内变化时,选取结构角为平均值温度所对应的极大值点也可以减小扰动所造成的影响。

An analytical study on transmitted intensity perturbance of Glan-Thompson prism with varying rotation angle is given, when the linearly polarized light enters in the normal incidence. The perturbance strongly affects the quality of transmitted polarizing light. In order to reduce this bad effect and hold the quality of transmitted polarized light, we reaserched the perturbance factor. Study shows that the transmitted intensity sensitively relies on the incident angle. In the experiment,a minute random variation of the incident angle around the structure angle of Glan-Thompson prism is found, which gaves rise to the perturbance. Selecting the right angle could reduce the perturbance. For the same purpose,we should reduce the thickness of the glue in certain wavelength to the full and select the hump at the average temperature when the temperature varied.