光学反馈腔增强吸收光谱技术中干涉抑制方法  

Interference suppression method in optical feedback-cavity enhanced absorption spectroscopy technology

作　　者：程桐 杨天悦 宫廷 郭古青 邱选兵[1] 李传亮[1] 赵刚[2] 马维光[2] Cheng Tong;Yang Tian-Yue;Gong Ting;Guo Gu-Qing;Qiu Xuan-Bing;Li Chuan-Liang;Zhao Gang;Ma Wei-Guang(Shanxi Engineering Research Center of Precision Measurement and Online Detection Equipment,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China)

机构地区：[1]太原科技大学应用科学学院,山西省精密测量与在线检测装备工程研究中心,太原030024 [2]山西大学激光光谱研究所,量子光学与光量子器件国家重点实验室,太原030006

出　　处：《物理学报》2022年第6期169-174,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:U1810129,52076145,11904252);山西省科技成果转化引导专项项目(批准号:201904D131025);应用光学国家重点实验室开放基金(批准号:SKLAO-201902)资助的课题.

摘　　要：提出了一种降低光学反馈腔增强吸收光谱(optical feedback-cavity enhanced absorption spectroscopy,OF-CEAS)系统中干涉噪声影响的干涉抑制方法.使用Ariy函数分析了透射腔模信号中存在的干涉噪声,研究发现该系统中的干涉信号源自于光束在前腔镜内的多次反射,并通过更换3种厚度不同的平面反射镜进行验证.提出利用Ariy函数拟合得到的干涉信号作为无吸收情况下的背景信号,与测量气体的吸收信号相减直接获得无背景吸收光谱信号.该方法有效避免了OF-CEAS系统中,由于环境因素导致腔体稳定性改变等原因造成的测量误差.最后,基于该方法测量了1.53μm附近的乙炔气体吸收特性,评估系统的探测灵敏度为7.143×10^(-8)(1σ),实验表明该方法在提高OF-CEAS系统的探测灵敏度方面有着很大的应用前景.In this paper,an efficient method of suppressing interference is presented in an optical feedback-cavity enhanced absorption spectroscopy(OF-CEAS)system.The Ariy function is used to analyze the interference signal in the transmission cavity mode signal.It is found that the interference signal in system originates from multiple reflections of the beam in the mirror,which is verified by replacing three kinds of cavity front mirrors with different thickness values.The result obtained by the Ariy function is used as a background signal,and the absorption spectrum signal can be obtained by making its difference from the absorption signal of the measured gas.This method effectively avoids the frequency error caused by the inability to measure the background signal and the absorption signal at the same time in the OF-CEAS system.Finally,the absorption characteristics of acetylene gas at 1.53μm are measured.Based on the signal-to-noise ratio,the detection sensitivity of the system is evaluated to be 7.143×10^(-8)(1σ).Experiments show that this method is effective in improving the detection sensitivity of OF-CEAS system.

关 键 词：光学反馈腔增强吸收光谱 干涉效应 Ariy 函数 

分 类 号：O433.51[机械工程—光学工程]