【摘要】 对倾斜入射时窄带薄膜滤光片的特性作了描述 ,由于低折射率间隔层的滤光片 ,倾斜入射时 p偏振分量的通带比s分量更移向短波 ,而高折射率间隔层的滤光片则反之 ,因此可把间隔层同时设计成高、低折射率两种材料 ,或选用适当的中间折射率材料 ,使p分量和s分量两个通带的中心波长重合。设计了用于 2 0°入射角的密集波分复用 (DWDM )滤光片 ,并给出了实验结果。更多还原

【Abstract】 The characteristic of thin film narrowband filters used in tilted incidence is described. The wavelength shift to shorter wavelength in a low index spacer filter for p polarization component is larger than that for s polarization component when filter is tilted. On the contrary, the shift in a high index spacer filter for p component is less than that for s component. Therefore the passbands of a tilted filter can be centered at the same wavelength for two polarization modes by means of using high and low index materials for a spacer, or selecting a moderate index material instead of a spacer. Designs of DWDM filters used for incident angle of 20°are presented, and the experimental results are discussed.更多还原