Analysis of extinction ratio of a Glan-Taylor prism

The calculation formula of Glan -Taylor prism's transmittance between emanative lights'azimuth, incident angle and structure angle of prism was obtained by using refraction law and Fresnel formula as well as the ray-tracing method. The relationship between the extinction ratio and transmittance was indicated. By computer simulation of Matlab, the characteristic of extinction ratio in the whole azimuth was analyzed; the extinction ratio's transformation relationship along with incident angle and structure angle was investigated. From simulation results, we discover that the extinction ratio is unacted on the incident angle when the angle is in the vertical azimuth of prism's optical axis. And the ratio becomes bad with increasing of the structure angle. The theoretical results are in good agreement with problems appeared from practical system which verifies its correctness, and it explains the problem in project item. The work of this article has great guiding significance in the design and use of Glan-Taylor prism.