Abstract
Dual-comb spectroscopy (DCS) provides broadband, high-resolution, high-sensitivity amplitude and phase spectra within a short measurement time, thus holding promises for atmospheric spectroscopy. However, previous research has been limited to measuring over open-air paths of about 20 km. Here, by developing a bistatic set-up using time–frequency dissemination and high-power optical frequency combs, we implement DCS over a 113 km turbulent horizontal open-air path. We successfully measure the absorbance spectra of CO2 and H2O with a 7 nm spectral bandwidth and a 10 kHz frequency accuracy, and achieve a sensing precision of <2 ppm in 5 min and <0.6 ppm in 36 min for CO2. We anticipate our system to find immediate applications in the monitoring of urban greenhouse gas and gaseous pollutants emission. Our technology may also be extended to satellite-based DCS for greenhouse gas monitoring and calibration measurements.
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Data availability
All data generated or analysed during this study are included in this article (and its Supplementary Information files). All data are available from the corresponding author upon reasonable request. Source data are provided with this paper.
Code availability
All relevant codes or algorithms are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank S.-M. Hu and Y. Tan from the University of Science and Technology of China. This research was supported by the National Natural Science Foundation of China (grant nos. 42125402, 42188101, T2125010 and 61825505); National Key Research and Development Programme of China (grant nos. 2020YFA0309800 and 2020YFC2200103); Strategic Priority Research Programme of Chinese Academy of Sciences (grant no. XDB35030000); Anhui Initiative in Quantum Information Technologies (grant no. AHY010100); Key R&D Plan of Shandong Province (grant nos. 2020CXGC010105 and 2021ZDPT01); Shanghai Municipal Science and Technology Major Project (grant 2019SHZDZX01); Innovation Programme for Quantum Science and Technology (grant nos. 2021ZD0300105 and 2021ZD0300301); Fundamental Research Funds for the Central Universities; the Ground-based Space Environment Monitoring Network (the Chinese Meridian Project).
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H.-F.J., X.-H.X., Q.Z., X.-K.D. and J.-W.P. conceived the experiment. J.-J.H., W.Z., R.-C.Z., Q.S., J.-Y.G., H.-F.J., X.-H.X. and Q.Z. designed the dual-comb spectroscopy set-up. J.-G.R., T.Z. and J.-J.J. built the optical telescopes. L.H., X.-X.P. and H.-F.J. developed the optical frequency combs and amplifiers. Q.S., M.L., J.-Y.G. and J.-J.H. developed the linear optical sampling optics and electrics. X.-P.S., M.L., Q.S. and J.-Y.G. designed the data acquisition software. J.-J.H., W.Z., R.-C.Z., Q.Y., J.-Y.G., Q.S. and M.L. developed the data process algorithms and designed the data process software. All authors carried out the experiment, analysed the data and contributed to the writing of the paper.
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Extended data
Extended Data Fig. 1 The locking direction of the frequency combs at both terminals.
The fCEO and the fBeat are set to be equal but in opposite directions for each terminal.
Extended Data Fig. 2 Detailed experimental optical setup of single terminal.
USL: Ultra-stable laser; Tele: Telescope; BPD: Balanced photondetector; GPS: Global Position System; Cir: Circulator; EDFA: Erbium-doped fiber amplifiers.
Extended Data Fig. 3 Detailed experimental optical setup of Telescope.
MIR: Mirror; PBS: Polarizing beam splitter; FC: Fiber collimator; WDM: wavelength division multiplexer; BE: Beam expander; FSM: Fast steering mirror; LD: Laser diode; DM1: Dichroic beam splitter, 785nm transmitted, 1545nm reflected; DM2: Dichroic beam splitter, 914nm transmitted, 1545nm reflected; CMOS: Complementary metal–oxide semiconductor.
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Supplementary Fig. 1, Discussion and Tables 1–3.
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Statistical source data.
Source Data Fig. 2
Statistical source data.
Source Data Fig. 3
Statistical source data.
Source Data Fig. 4
Statistical source data.
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Han, JJ., Zhong, W., Zhao, RC. et al. Dual-comb spectroscopy over a 100 km open-air path. Nat. Photon. (2024). https://doi.org/10.1038/s41566-024-01525-9
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DOI: https://doi.org/10.1038/s41566-024-01525-9