Mid-infrared Optical Frequency Comb-based Fourier Transform Spectrometer for Broadband Molecular Spectroscopy  

用于宽带分子光谱的光频梳傅里叶变换光谱仪

作　　者：Feihu Cheng Weixiong Zhao Bo Fang Nana Yang Shuangshuang Li Weijun Zhang Lunhua Deng Weidong Chen 程飞虎;赵卫雄;方波;杨娜娜;李双双;张为俊;邓伦华;陈卫东(中国科学院合肥物质科学研究院安徽光学精密机械研究所,合肥230031;华东师范大学物理系,精密光谱国家重点实验室,上海200062;法国滨海大学大气物理化学实验室,敦刻尔克59140)

机构地区：[1]Laboratory of Atmospheric Physico-Chemistry,Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China [2]State Key Laboratory of Precision Spectroscopy,and Department of Physics,East China Normal University,Shanghai 200062,China [3]Laboratoire de Physicochimie de'Atmosphere,Universite du Littoral Cote d'Opale,Dunkerque 59140,France

出　　处：《Chinese Journal of Chemical Physics》2024年第4期471-480,I0093,共11页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation China(No.42022051,No.U21A2028);Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.Y202089);the HFIPS Director's Fund(No.YZJJ202101,No.BJPY2023A02).

摘　　要：Optical frequency combbased Fourier transform spectroscopy has the features of broad spectral bandwidth,high sensitivity,andmultiplexed trace gas detection,which has valuable application potential in the fields of precision spectroscopy and trace gas detection.Here,we report the development of a mid-infrared Fourier transform spectrometer based on an optical frequency comb combined with a Herriott-type multipass cell.Using this instrument,the broadband absorption spectra of several important molecules,including methane,acetylene,water molecules and nitrous oxide,are measured by near real-time data acquisition in the 2800-3500 cm^(-1)spectral region.The achieved minimum detectable absorption of the instrument is 4.4×10^(-8)cm^(-1)·Hz^(-1/2)per spectral element.Broadband spectra of H_(2)0 are fited using the Voigt profile multispectral fitting technique and the consistency of the concentration inversion is 1%.Our system also enables precise spectroscopic measurements,and it allows the determination of the spectral line positions and upper state constants of N_(2)O in the(0002)-(1000)band,with results in good agreement with those reported by Toth[Appl.Opt.30,5289(1991)].基于光学频率梳的傅里叶变换光谱具有光谱带宽宽、灵敏度高、多路复用检测痕量气体等特点,在精密光谱和痕量气体检测领域具有重要的应用潜力本文介绍了基于光学频率梳和Herriott型光学多通池相结合的中红外傅立叶变换光谱仪的研制.利用该仪器,通过实时数据采集,在2800~3500cm^(-1)光谱范围内测量了包括甲烷、乙炔、水分子和氧化亚氮在内的几种重要分子的宽带吸收光谱.仪器的最小可检测吸收为4.4×10^(-8)cm^(-1)·Hz^(-1/2)每光谱单元。采用Voigt线形多光谱拟合技术拟合H_(2)O的宽带光谱,浓度的一致性为1%.该系统还能进行精确的光谱测量,利用它确定了N_(2)O分子(0002)-(1000)谱带的谱线位置和上能态常数,其结果与Toth[Appl.Opt.30,5289(1991)的报道相一致。

关 键 词：Mid-infrared optical frequency comb Multi-pass cell Fourier transform infrared spectrometer 

分 类 号：TH744.1[机械工程—光学工程]