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透射比是评价格兰泰勒棱镜性能优劣的一个重要指标,分析了偏振干涉成像光谱仪中重要偏光部件即格兰泰勒棱镜的分光机理,运用光线追迹方法,推导出了晶体光轴不平行时棱镜透射比精确理论计算公式;通过计算机模拟对其传输特性进行了详尽分析,得出了系统透射比随晶体光轴倾斜角和波长变化的关系曲线;给出了在满足系统透射比条件下格兰泰勒棱镜晶体光轴误差被限定的有效区间范围。这一结论为偏振干涉成像光谱仪的优化设计提供了理论指导和技术支持。
The transmittance is an important index to evaluate the performance of Glan Taylor prism. The spectroscopic mechanism of the Glan Taylor prism, which is an important polarization component in the polarization interference imaging spectrometer, is analyzed. Using the ray tracing method, the optical axis of the Glan Taylor prism is deduced when the optical axis is not parallel Prism transmittance accurate theoretical formula; Through computer simulation of its transmission characteristics were analyzed in detail, the system transmittance was obtained with the optical axis tilt angle and wavelength changes of the curve; given the system to meet the conditions of transmittance grid Lan Taylor prism crystal optical axis error is limited to the effective range of range. This conclusion provides the theoretical guidance and technical support for the optimal design of polarization interference imaging spectrometer.