新型静态傅里叶变换光谱仪干涉系统仿真与分析  

Simulation and Analysis of Interference System in Novel Static Fourier Transform Spectrometer

作　　者：郑莹 吕金光[2] Zheng Ying;Lu Jinguang(School of Science,Shenifang Ligong University,Shenyang,Liaoning 110159,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun,Jilin 130033,China)

机构地区：[1]沈阳理工大学理学院,辽宁沈阳110159 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学学报》2021年第18期240-246,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61805239);中国科学院青年创新促进会基金(2018254);沈阳理工大学引进高层次人才科研项目(1010147000805);沈阳理工大学科研创新团队建设计划资助项目;辽宁省教育厅面上青年人才项目。

摘　　要：提出了一种新型静态傅里叶变换光谱仪(FTS)。在该光谱仪的干涉系统中,采用两个具有周期性结构的微反射镜代替马赫-曾德尔干涉系统的平面镜,不仅无任何驱动部件,还无回溯光产生,进而实现了FTS的静态化和高光通量。介绍了静态FTS的工作原理,建立了基于微反射镜的马赫-曾德尔干涉系统模型,仿真得到了该干涉系统的干涉图和频域光谱图。与理想情况的结果相比,仿真得到的干涉图中条纹对比度下降且边缘区域较为严重,仿真得到的频域光谱图中主频峰值降低且基线噪声明显。分析表明,在光束倾斜入射时,两个微反射镜的阶梯式周期性结构不仅会造成干涉光场的能量分布不均匀和两束相干光束偏离,还会引起衍射效应。仿真结果表明,增加两个微反射镜子反射面的个数和子反射面的长度可以有效减小干涉图中信息的失真。进一步地,在满足光谱仪性能的前提下,减小两个微反射镜子反射面的阶梯间隔可获得理想的频域光谱图。A novel static Fourier transform spectrometer(FTS)is proposed.The interference system of the spectrometer uses two micro mirrors with periodic structure to replace the plane mirrors in the Mach-Zehnder interference system,without any driving parts and generation of backtracking light,which realizes the static state and high optical flux of the FTS.In this paper,the working principle of static FTS is introduced,the Mach-Zehnder interference system model based on micro mirrors is established,and the interferogram and spectrogram in frequency domain of the interference system are obtained by simulation.Compared with the ideal results,the fringe contrast is reduced and the reduction in the edge area is more serious in the interferogram obtained by simulation,and the peak value of the main frequency is reduced and the baseline noise is obvious in the spectrogram in frequency domain obtained by simulation.The analysis shows that when the incident beam is inclined,the stepped periodic structure of two micro mirrors will not only cause the uneven energy distribution of the interference light field and the deviation of two coherent beams,but also cause the diffraction effect.The simulation results show that the distortion of information in interferogram can be effectively reduced by increasing the number of subreflectors of two micro mirrors and the length of subreflectors.Furthermore,the ideal spectrogram in frequency domain can be obtained by reducing the step interval between the subreflectors of the two micro mirrors under the premise of satisfying the performance of the spectrometer.

关 键 词：光谱学 傅里叶变换光谱仪 马赫-曾德尔干涉系统 微反射镜 

分 类 号：O433.4[机械工程—光学工程]