受抑全内反射的偏振分光器

Polarizing beam splitter based on frustrated total internal reflection

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 nm、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 presented 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 angle. The basic design principle is emphatically analyzed. The design of PBS is applied in projection system. The spectral wavelength region of the design is 420-080 nm,with the range of incident angle of ±10° in air.The extinction ratios for the reflected and transmitted beams are over 1000.