三波长宽角度消偏振平板分光膜的设计

分光膜都是倾斜使用的，不可避免地存在S和P 2个偏振分量的分离。在许多实际应用中，这是一个迫切需要解决的刺手难题。基于Thelen和Costich理论，选择初始膜系材料和结构，并在Needle合成法与Conjugate graduate精炼法的帮助下，采用全介质材料设计了532nm，633nm和1315nm三波长宽角度消偏振平板型分光膜，空气中入射角的变化范围为45°±5°。结果表明：在宽角度范围内，此膜系在(532±10)nm，(633±10)nm和(1315±10)nm范围的偏振分离都能比较好地满足消偏振要求。

Design of wide-angle depolarization flat-plate light-splitting film for three wavelengths

Since the light-splitting film is always tilted, the separation between s- and p-component is inevitable. The separation has become a difficult problem to be solved in many applications. The material and structure of original film system were selected according to Costich and Thelen theories. A wide-angle depolarization flat-plate light-splitting film for three wavelengths (532nm, 633nm and 1315nm) was designed with all-dielectric materials by Needle synthesis method and Conjugate graduate refine method. The variation range of the incident angle in the air is 45°±5°. The design and analysis results show that the polarization separation of the film system in the spectral range of (532±10)nm, (633±10)nm and (1315±10)nm can meet the requirement of the depolarization in the wide-angle range.