针对光学系统中可见/红外宽光谱分色片的偏振特性, 采用诱导透射法设计了满足偏振遥感光学系统能量要求的可见/红外宽光谱分色片, 并对其偏振特性进行了分析. 通过计算获得了透射带400~900 nm可见/红外宽光谱分色片的偏振情况, 采用等效层理论在其基底背面设计了偏振调控膜系, 对分色片透射带的偏振度加以调控. 使用needle优化算法, 设定了不同优化目标, 得到了三种不同的设计结果, 在可见光波段的偏振度范围分别为0.013~0.0376、0.068~0.108和0.098~0.147. 设计结果显示分色片透射带偏振特性在一定程度上可调, 调控后可以满足系统对透射光在不同偏振度下的要求.

A visible/infrared broadband dichroic beamsplitter which can meet the light energy boundary of polarization remote sensing optical system was designed with the induced-transmission method. The design was based on polarization characteristics of the visible/infrared broadband dichroic beamsplitter, and actual characteristics of the dichroic beamsplitter were analyzed. When the polarization characteristics at the transmission spectrum from 400 nm to 900 nm was calculated, the coating series was designed on the back of substrate with the equivalent layer theory to control the polarization character of the dichroic beamsplitter. A needle optimal algorithm was adopted to set various optimization objectives, and came out with three different designs which have respective polarization ranges of 0.013~0.0376, 0.068~0.108 and 0.098~0.147. The design result shows that the polarization characteristics of dichroic beamsplitter at transmission spectrum are controllable to some extent, and the design can meet the needs of different polarization characteristics in optical system.