| Design of non-polarizing thin film edge filters |
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| 作者姓名： | GU Pei-fu ZHENG Zhen-rong |
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| 作者单位： | State Key Laboratory of Modern Optical Instrumentation，Zhejiang University，Hangzhou 310027，China |
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| 基金项目： | Project (No. 60078001) supported by the National Natural ScienceFoundation of China |
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| 摘 要： | INTRODUCTION The design of tilted edge filters which avoid the polarization problems is a much more difficult task than that of polarizer design and there is no com-pletely effective method (Macleod, 2001). Edge fil-ters are divided into two main groups, long-wave-pass and short-wave-pass. They are widely used for vari-ous optical purposes, especially in wavelength divi-sion multiplexers (WDM) (Nosu et al., 1979) and multimedia color projection display (Zhang et al., 1999). Unfortunate…
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| 关 键 词： | 非偏振设计 薄膜光学 干涉边缘滤器 倾斜入射 |
| 收稿时间： | 2005-06-28 |
| 修稿时间： | 2006-01-04 |
Design of non-polarizing thin film edge filters |
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| GU Pei-fu,ZHENG Zhen-rong.Design of non-polarizing thin film edge filters[J].Journal of Zhejiang University Science,2006,7(6):1037-1040. |
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| Authors: | Pei-fu Gu Zhen-rong Zheng |
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| Institution: | (1) State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China |
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| Abstract: | The separation between s-and p-polarization components invariably affects thin film edge filters used for tilted incidence
and is a difficult problem for many applications, especially for optical communication. This paper presents a novel design
method to obtain edge filters with non-polarization at incidence angle of 45°. The polarization separation at 50% transmittance
for a long-wave-pass filter and a short-wave-pass filter is 0.3 nm and 0.1 nm respectively. The design method is based on
a broadband Fabry-Perot thin-film interference filter in which the higher or lower interference band at both sides of the
main transmittance peak can be used for initial design of long-wave-pass filter or short-wave-pass filter and then can be
refined to reduce the transmittance ripples. The spacer 2H2L2H or 2L2H2L of the filter is usually taken. Moreover, the method for expanding the bandwidth of rejection and transmission is explained.
The bandwidth of 200 nm for both rejection region and transmission band is obtained at wavelength 1550 nm. In this way, the
long-wave-pass and short-wave-pass edge filters with zero separation between two polarization components can easily be fabricated.
Project (No. 60078001) supported by the National Natural Science Foundation of China |
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| Keywords: | Thin film optics Interference edge filters Non-polarization design |
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