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关于部分偏振光能量传递和偏振态的光线椭圆分析方法
Ray ellipse method of analyzing the power and polarization state of partially polarized light
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摘要: 部分偏振光传播时的光强和偏振态变化情况比较复杂,尤其是当大数值孔径成像时,光束的偏振态还会影响成像质量.本文提出一种用于分析部分偏振光能量传递和偏振态的光线椭圆方法,采用光线椭圆叠加的办法来分析光束在各向同性的均匀介质中传输时能量和偏振态的变化情况,同时直观性好,计算量小.论文最后,对大数值孔径、高像质的齐明透镜系统讨论了入射无偏振光的能量、偏振态变化,以及偏振效应问题.结果表明,大数值孔径使成像光束中TM偏振光强度相对增加,影响成像对比度;提高像方介质的折射率,会改善此种偏振效应问题.Abstract: It is difficult to cope with the changes in power and polarization for partially polarized light. The light polarization will also affect the image quality, especially for imaging with large numerical aperture. A novel method of analyzing the power and the polarization state of partially polarized light is proposed in this paper. This method has a good intuitiveness and requires much smaller computation. An aplanatic lens system is simulated. Polarization effect caused is analyzed with this method. The results show that for the imaging light the intensity of TM polarized light relatively increases because of large numerical aperture, which will influence image contrast. Imaging in high refractive index medium can be used to improve this problem.
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