Cavity-enhanced photoacoustic dual-comb spectroscopyOACSTPCD
Cavity-enhanced photoacoustic dual-comb spectroscopy
Photoacoustic dual-comb spectroscopy(DCS),converting spectral information in the optical frequency domain to the audio frequency domain via multi-heterodyne beating,enables background-free spectral measurements with high resolution and broad bandwidth.However,the detection sensitivity remains limited due to the low power of individual comb lines and the lack of broadband acoustic resonators.Here,we develop cavity-enhanced photoacoustic DCS,which overcomes these limitations by using a high-finesse optical cavity for the power amplification of dual-frequency combs and a broadband acoustic resonator with a flat-top frequency response.We demonstrate high-resolution spectroscopic measurements of trace amounts of C2H2,NH3 and CO in the entire telecommunications C-band.The method shows a minimum detection limit of 0.6 ppb C2H2 at the measurement time of 100 s,corresponding to the noise equivalent absorption coefficient of 7 × 10-10cm-1.The proposed cavity-enhanced photoacoustic DCS may open new avenues for ultrasensitive,high-resolution,and multi-species gas detection with widespread applications.
Zhen Wang;Qinxue Nie;Haojia Sun;Qiang Wang;Simone Borri;Paolo De Natale;Wei Ren
Department of Mechanical and Automation Engineering,The Chinese University of Hong Kong,New Territories,Hong Kong SAR,ChinaState Key Laboratory of Applied Optics,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,130033 Changchun,ChinaCNR-INO—Istituto Nazionale di Ottica,and LENS—European Laboratory for Nonlinear Spectroscopy,50019 Sesto Fiorentino,Italy
《光：科学与应用（英文版）》 2024 (004)
610-618 / 9
This research was supported by the General Research Fund(14209220,14208221)and Collaborative Research Fund(C4002-22Y)from the University Grants Committee,Innovation and Technology Fund(GHP/129/20SZ)from the Innovation and Technology Commission,Hong Kong SAR,China;National Natural Science Foundation of China(NSFC)(52122003,62005267,62375262).We would like to acknowledge Beijing Infrared Semiconductor Technology Co.LTD and LaSense Technology Limited for providing low-noise photodetectors and electrical circuits.We acknowledge the helpful discussion on the design of acoustic resonators with J.Wu at Chongqing University.We also acknowledge M.Hu from the Chinese Academy of Sciences for sharing the EOM device.
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