红外无偏振效应分光棱镜的理论分析与设计

Theoretical analysis and design of infrared non-polarizing beam splitter

当光线倾斜入射时,膜层不可避免地会产生偏振效应.在很多的实际应用中,这种偏振效应是有害的.文中回顾了消偏振设计的研究历程,讨论了各自方法的特点.表明已见报道的消除分光棱镜偏振效应的方法不多,而且大多限于可见光波段.文中提出用于红外波段的无偏振效应分光棱镜的设计方法及其理论分析,针对不同型号玻璃基底分别给出了相应的红外无偏振效应分光棱镜膜系的具体设计,计算了红外消偏振膜系的反射率与反射相移,提供了其计算机仿真结果,结果表明设计方案合理可行.

When used at oblique angles of incidence, the reflectance and transmittance of thin films exhibit strong polarization effects. However, for many applications this effect is undesirable and should be reduced. At present, of the few methods to reduce polarization effects, most are only suitable for visible light. A design method is proposed and theoretical analysis is given for an infrared non-polarizing beam splitter in a cube. The designs for different substrates were demonstrated and the reflectance and reflection-induced retardance were calculated. Optical properties simulations show that the methods are acceptable.