改善液晶光阀投影光学系统偏振特性的理论设计方法

Theoretical Design Method for Improving the Polarization Performance of LCLV Projection System

定量分析了液晶光阀投影光学系统中影响系统对比度的主要因素 ,利用矢量方法建立三维空间数学模型对光线进行追迹 ,并利用琼斯矩阵和矢量光学的原理分析了偏振器件———主要是波片———和各种光学薄膜对光学系统性能的影响。给出了在一定假设条件下的对没有波片的光学系统和插入波片后的光学系统的仿真计算结果。两组数据比较表明在光路中插入合适相位差的波片可以显著提高系统对比度等性能。

The factors affecting the contrast performance of liquid crystal light volve (LCLV) projection system are quantitatively analyzed. A three dimensional mathematic model is built to trace the rays. The effects of wave plates and optical thin films are analyzed based on the theory of Jones matrix and vector optics. The theoretic calculation results of systems with or without wave plates are presented. From these data, it is concluded that wave plates with proper phase changes can greatly improve system contrast.