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用于宽带分子光谱的光频梳傅里叶变换光谱仪

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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2800～3500 cm-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H2O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N2O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.
Mid-infrared Optical Frequency Comb-based Fourier Transform Spectrome-ter for Broadband Molecular Spectroscopy
Optical frequency comb-based Fourier transform spectroscopy has the fea-tures of broad spectral bandwidth,high sensitiv-ity,and multiplexed trace gas detection,which has valuable appli-cation potential in the fields of precision spectroscopy and trace gas detection.Here,we re-port 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 H2O are fitted using the Voigt profile multispectral fitting technique and the consistency of the concentration inver-sion is 1％.Our system also enables precise spectroscopic measurements,and it allows the de-termination of the spectral line positions and upper state constants of N2O in the(0002)-(1000)band,with results in good agreement with those reported by Toth[Appl.Opt.30,5289(1991)].

Mid-infrared optical frequency combMulti-pass cellFourier transform in-frared spectrometer

程飞虎、赵卫雄、方波、杨娜娜、李双双、张为俊、邓伦华、陈卫东

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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

中红外光学频率梳 多通池 傅里叶变换红外光谱仪

National Natural science Foundation of ChinaNational Natural science Foundation of ChinaYouth Innovation Promotion Association of the Chinese Academy of SciencesHFIPS Director's FundHFIPS Director's Fund

42022051U21A2028Y202089YZJJ202101BJPY2023A02

2024

10.1063/1674-0068/cjcp2401007

化学物理学报(英文版)
中国物理学会

化学物理学报(英文版)

CSTPCDEI
影响因子：0.162
ISSN：1674-0068
年,卷(期)：2024.37(4)