Mid-infrared dual-comb spectroscopy with electro-optic modulators

查看全文 作　　者：Ming [1,2]Yan;Pei-Ling [1,2]Luo;Kana [1,2]Iwakuni;Guy [3]Millot;Theodor W [1,2]Hänsch;Nathalie [1,2,4]Picqué

机构地区：[1]Max-Planck-Institut für Quantenoptik,85748 Garching,Germany;[2]Fakultät für Physik,Ludwig-Maximilians-Universität München,80799 München,Germany;[3]Laboratoire Interdisciplinaire Carnot de Bourgogne,UMR 6303 CNRS-Univ.Bourgogne Franche-Comté,F-21078 Dijon,France;[4]Institut des Sciences Moléculaires d’Orsay(ISMO),CNRS,Univ.Paris-Sud,UniversitéParis-Saclay,F-91405 Orsay,France

出　　处：《Light(Science & Applications)》索引2017年第6卷第1期,共8页

基　　金：European Research Council(Advanced Investigator Grant 267854);Munich Center for Advanced Photonics Max Planck Foundation;IXCORE Fondation pour la Recherche;PARI PHOTCOM Région Bourgogne,Labex ACTION program(Contract No.ANR-11-LABX-0001-01). 摘　　要：Absorption spectroscopy of fundamental ro-vibrational transitions in the mid-infrared region provides a powerful tool for studying the structure and dynamics of molecules in the gas phase and for sensitive and quantitative gas sensing.Laser frequency combs permit novel approaches to perform broadband molecular spectroscopy.Multiplex dual-comb spectroscopy without moving parts can achieve particularly high speed,sensitivity and resolution.However,achieving Doppler-limited resolution in the mid-infrared still requires overcoming instrumental challenges.Here we demonstrate a new approach based on difference-frequency generation of frequency-agile near-infrared frequency combs that are produced using electro-optic modulators.The combs have a remarkably flat intensity distribution,and their positions and line spacings can be freely selected by simply dialing a knob.Using the proposed technique,we record,in the 3-μm region,Doppler-limited absorption spectra with resolved comb lines within milliseconds,and precise molecular line parameters are retrieved.Our technique holds promise for fast and sensitive time-resolved studies of,for example,trace gases. 关键词：Fourier transform spectroscopy frequency comb MID-INFRARED molecular spectroscopy

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Mid-infrared dual-comb spectroscopy with electro-optic modulators

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