空间引力波探测系统中超光滑光学元件表面散射特性分析

Analysis of surface scattering characteristics of ultra-smooth optical components in gravitational wave detection system

在引力波探测系统中,超光滑光学元件表面散射特性对高精度引力波测量至关重要。本文针对超光滑光学元件,建立了一种能快速准确地分析和预测其表面散射特性的非傍轴标量散射模型Generalized Beckmann-Kirchhoff(GBK)。在此基础上,研究了入射角度、散射方位角对P偏振和S偏振入射光的角分辨散射分布的影响,以及入射角度、散射方位角、自相关长度、斜率、截止频率以及表面粗糙度等因素对不同表面统计分布特征下的角分辨散射分布的影响。研究结果可为引力波探测系统中超光滑光学元件的加工、系统杂散光的产生及抑制等提供参考。

In gravitational-wave detection systems,the surface scattering properties of ultra-smooth optical components play a crucial role in achieving high-precision gravitational-wave measurements.To analyze and predict the surface scattering properties of ultra-smooth optical components accurately and rapidly,a non-paraxial scalar scattering model,the Generalized Beckmann-Kirchhoff(GBK)model,was built up.On this basis,the influences of both the incident angle and the scattering azimuth angle on the angular resolved scattering distributions of both P-polarized and S-polarized incident light were investigated.Under different statistical distribution characteristics of optical surfaces,the effects of incident angle,azimuth angle,autocorrelation length,slope,cut-off frequency,and surface roughness on the scattering angle resolution distribution were analyzed.The research results can provide useful references for the manufacturing of ultra-smooth optical components and the generation and mitigation of stray light in gravitational-wave detection systems.