入射角对格兰-泰勒棱镜透射光强的非线性扰动分析

Analysis of the incident angle's nonlinear disturbing effects on the transmitted light intensity of Glan-Taylor prisms

格兰-泰勒(Glan-Taylor)棱镜(GTP)旋转一周时的透射光强曲线通常会产生非线性误差而偏离马吕斯定律,主要表现为周期性扰动和透射光强曲线2个波峰不等高.以菲涅耳公式和多光束干涉理论为基础,借助几何模型,得到了格兰-泰勒棱镜的光强透射比公式,讨论了光束入射角对透射光强曲线2个波峰等高性的影响,较好地解释了实验中的非线性误差,给出了改进方向.

When Glan-Taylor prism （GTP） rotated a circle, the transmitted intensity curve usually deviated from Malus law due to the nonlinear disturbance. The deviation is shown as periodical disturbance and the inequality of adjacent peaks of the transmitted intensity curve. Using geometrical model, based on Fresnel formula and multiple beam interference theory, the light intensity transmission formula of Glan-Taylor prisms is obtained, and the effects of the beam＇s incident angle on the inequality of adjacent peaks of the transmitted intensity curve is discussed. The nonlinear disturbance in the experiments is well explained and improvement methods are provided.