基于强度调制的偏振光谱测量技术  

Polarization Spectrum Measurement Technology Based on Intensity Modulation

作　　者：李辉[1] 薛庆生 白皓轩 李子健[1] LI Hui;XUE Qingsheng;BAI Haoxuan;LI Zijian(School of Physics and Optoelectronic Engineering,Department of Information Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学信息科学与工程学部物理与光电工程学院,青岛266100

出　　处：《光子学报》2023年第4期119-128,共10页Acta Photonica Sinica

基　　金：中国科学院海洋大科学研究中心重点部署项目(No.COMS2019J04);国家自然科学基金(Nos.U2006209,41575023);山东省重点研发计划(No.2020CXGC010706);中国工程院咨询研究项目(No.2020‒XZ‒5‒03);人才计划项目(No.202112003);泰山学者科研经费(No.202105033008)。

摘　　要：针对现阶段强度调制偏振光谱测量技术在光程差域内不同通道间存在频谱信息串扰的不足,采用加窗插值傅里叶变换法,研究了不同切趾函数对强度调制偏振光谱测量技术的影响。首先,进行强度调制偏振光谱测量技术理论分析,完成强度调制模块的设计;其次,根据强度调制模块的设计指标,模拟入射光的光强信息及采用不同切趾函数的信息解调复原过程;最终,对强度调制偏振光谱测量系统进行仿真,根据仿真模型结合高分辨率光谱仪、平行光管等器件完成偏振光谱测量装置的搭建,进行偏振光谱测量实验。研究结果表明,偏振光谱测量系统设计指标选择合适的切趾函数可以减少光强信息截断过程中造成的频谱能量泄露,使光程差域内不同通道之间的串扰信息减少、偏振光谱复原精度提高,不同切趾函数切趾处理后线偏振光的偏振度最小误差由0.0768减小到0.0014,偏振度接近1。As one of the common methods to measure polarization information,intensity modulated polarization spectrum measurement technology has the advantages of high real-time performance and high time resolution,and is widely used in many fields.In this method,the stokes vector of the target light is modulated to the carrier signal of different frequencies by the intensity modulation module,and the spectral information of each element is modulated to the channel of different frequencies by the Fourier transform,finally,the polarization spectrum is obtained.Although the technique of intensity modulated polarization spectroscopy is simple and effective,there are still spectral overlap to varying degrees,which makes the Stokes parameters between channels interfere with each other and affects the accuracy of spectral reduction.At the same time,to meet the requirements of wide-band detection,on the basis of a certain spectral resolution of the spectrometer,the thickness of the intensity modulation module delay is rationally designed to reduce the interval between channels in the optical path difference domain,so as to achieve the purpose of wide-band operation range.Secondly,by increasing the thickness of the delayer,the modulation information generated by the polarization module is collected with a high-resolution spectrometer to achieve a wide-band detection range.Based on using high resolution spectrometer to realize the requirement of wide band detection,aiming at the shortage of overlapping between different channels in the optical path difference domain of the current intensity modulated polarization spectrum measurement technology,the generation of aliasing error in optical path difference domain is analyzed.The influence of different toecutting functions on the measurement error of intensity-modulated polarization spectrum is studied by using windowed interpolation FFT transformation.Firstly,the theoretical analysis of intensity modulation polarization spectral measurement technology is carried out to analyze the rela

关 键 词：偏振光谱测量技术 高分辨率光谱仪 切趾函数 加窗插值傅里叶变换算法 频谱能量泄露 

分 类 号：O433.4[机械工程—光学工程] X853[理学—光学]