宽角度反射式相位延迟器的设计

金属增强型反射镜在入射光非正入射的时候,两个不同的偏振态之间会产生不同的相移。利用最优技术设计了一种相位延迟器,其工作波长在640-670nm之间,入射角在40-50°范围内时,反射率>99%且相移为90°±20°。波长在670nm附近时相移对入射角不敏感。膜层厚度误差对相移影响最大。

Design of wide-angle reflection-induced phase retarder

When enhanced metallic reflector is used at an abnormal incidence the different phase shift of the polarization states may be occurred. An optimum technique was used to determine the layer thickness for a coating design that produced a 90°± 20°phase shift between the p- and s-polarization components when the angle of incident was changed from 40°to 50°in the designed 640-670 nm wavelength range while the average reflectivity was above 99%. The waveband around 670 nm was insensitive to the incident angle. The variation of the layer thickness was the most sensitive to the phase shift.