Adaptive-sampling near-Doppler-limited terahertz dual-comb spectroscopy with a free-running single-cavity fiber laser  

作　　者：Jie Chen Kazuki Nitta Xin Zhao Takahiko Mizuno TakeoMinamikawa Francis Hindle Zheng Zheng Takeshi Yasui 

机构地区：[1]Beihang University,School of Electronic and Information Engineering,Beijing,China [2]Tokushima University,Graduate School of Advanced Technology and Science,Tokushima,Japan [3]JST,ERATO MINOSHIMA Intelligent Optical Synthesizer,Tokushima,Japan [4]Tokushima University,Institute of Post-LED Photonics,Tokushima,Japan [5]Tokushima University,Graduate School of Technology,Industrial and Social Sciences,Tokushima,Japan [6]Tokushima University,Research Cluster on“Multi-scale VibrationalMicroscopy forComprehensive Diagnosis and Treatment of Cancer”,Tokushima,Japan [7]Universitédu Littoral Côte d’Opale,Laboratoire de Physico-Chimie de l’Atmosphère,Dunkerque,France [8]Beihang University,Beijing Advanced Innovation Center for Big Data-based Precision Medicine,Beijing,China

出　　处：《Advanced Photonics》2020年第3期50-60,共11页先进光子学（英文）

基　　金：The work at Tokushima University was supported by grants for the Exploratory Research for Advanced Technology(ERATO)MINOSHIMA Intelligent Optical Synthesizer(IOS)Project(JPMJER1304);the Japanese Science and Technology Agency;a Grant-in-Aid for Scientific Research(A)(19H00871/26246031);the Ministry of Education,Culture,Sports,Science,and Technology of Japan;Subsidy for Regional University and Regional Industry Creation,Cabinet Office,Japan.The work at Beihang University was supported by NSFC(61435002/61521091/61675014/61675015);Fundamental Research Funds for the Central Universities.The authors declare no competing financial interests.

摘　　要：Dual-comb spectroscopy(DCS)is an emerging spectroscopic tool with the potential to simultaneously achieve a broad spectral coverage and ultrahigh spectral resolution with rapid data acquisition.However,the need for two independently stabilized ultrafast lasers significantly hampers the potential application of DCS.We demonstrate mode-resolved DCS in the THz region based on a free-running singlecavity dual-comb fiber laser with the adaptive sampling method.While the use of a free-running single-cavity dual-comb fiber laser eliminates the need for two mode-locked lasers and their frequency control,the adaptive sampling method strongly prevents the degradation of spectroscopic performance caused by the residual timing jitter in the free-running dual-comb laser.Doppler-limit-approaching absorption features with linewidths down to 25 MHz are investigated for low-pressure acetonitrile/air mixed gas by comb-mode-resolved THz spectroscopy.The successful demonstration clearly indicates its great potential for the realization of lowcomplexity,Doppler-limited THz spectroscopy instrumentation.

关 键 词：optical comb TERAHERTZ dual-comb spectroscopy molecular spectroscopy 

分 类 号：TN248[电子电信—物理电子学]