概述了薄膜偏振分光器的研究现状及其主要特点,对不同于MacNeille设计原理的受抑全内反射偏振分光器进行了研究,这种偏振分光器基于受抑全内反射和薄膜干涉原理,当入射角大于临界角时,在宽波段宽角度范围内反射P偏振光,透射S偏振光.重点分析这种偏振分光器的设计原理,设计了波长范围为420～680 am、空气中的入射角范围为±10°、膜系的消光比为Ts/Tp≥1000的用于背投系统的薄膜偏振分光器.

The existing status and main characters of thin- film polarizing beam splitter (PBS) are pre- sented and demonstrated. Frustrated total internal reflection and thin film interference are simultaneously employed to allow S- polarized light to be transmitted and P- polarized light to be reflected over a wide range of wavelengths and angles of incidence. The PBS is operated at angles greater than the critical an- gle. The basic design principle is emphatically analyzed. The design of PBS is applied in projection sys- tem. The spectral wavelength region of the design is 420～680 nm,with the range of incident angle of ± 10°in air.The extinction ratios for the reflected and transmitted beams are over 1000.