近红外双波段消偏振分光膜的设计

大角度倾斜入射时，光学薄膜表现出强烈的偏振效应。这一现象在大部分应用场合会带来系统光学性能的劣变，然而控制偏振效应的光学薄膜设计是困难的。分析了产生偏振效应的内在原因，采用由三种全介质材料构成的四层膜堆和等效层结构膜堆组合得到初始膜系，结合单纯形法和共轭梯度法的多级优化，设计了1300~1330 nm和1535~1565 nm两个波段范围内分光比都为11的近红外双波段消偏振分光膜。结果显示，在45°入射时，在两个工作波段的s分量和p分量的反射率曲线偏振分离小，反射和透射引起的相位变化也控制在很小范围。

Abstract

When used at oblique angle incidence, optical thin films exhibit strong polarization effects. This phenomenon will make the optical performance worsen in most application cases. But the design of optical thin film system to control the polarization effect is very difficult. The physical mechanism of the polarization effect is analyzed first, and then a near-infrared two-waveband nonpolarizing beam splitter at 1300~1330 and 1535~1565 nm spectral ranges with the splitting ratio of 11 is designed. The initial thin film stack is formed with a four-layer set and an equivalent layer using three all dielectric materials. Then it is optimized in multiple steps by simplex and conjugate gradient algorithms. According to the results, in the working spectrum range with the incident angle of 45°, it maintains a very low polarization ratio whether reflectance or transmittance induces phase changes.

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王文梁, 郝宏刚. 近红外双波段消偏振分光膜的设计[J]. 光学学报, 2011, 31(11): 1131002. Wang Wenliang, Hao Honggang. Designs of Near Infrared Two-Waveband Non-Polarizing Beam Splitter[J]. Acta Optica Sinica, 2011, 31(11): 1131002.

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