Abstract
We demonstrated a multipass-assisted dual-comb gas sensor for the simultaneous and sensitive detection of C2H2 and NH3 near 1.5 μm using a single free-running fiber laser. Two pulse trains generated from the shared cavity in the passively mode-locked fiber laser ensure the mutual coherence and common-mode noise rejection. One of the comb pulse trains passed through an open-path multipass cell with an effective path length of 4 m. A synchronized acquisition technique was adopted for more efficient interferogram acquisition compared with the conventional continuous acquisition method. At an acquisition time of 1.5 s, we obtained a signal-to-noise ratio of more than 600 by 1500 averages of the acquired spectrum of 0.1% C2H2. Pressure broadening of C2H2 and NH3 in the frequency range of 6503–6530 cm−1 between 0.1 and 1 bar were captured by the dual-comb sensor. Finally, the free-running fiber laser-based dual-comb sensor successfully analyzed the C2H2/NH3 mixtures, enabling real-time gas sensing without using complex optical and electronic feedback systems.
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This research is supported by National Natural Science Foundation of China (51776179, 61435002, 61675014, 61675015).
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Xu, K., Zhao, X., Wang, Z. et al. Multipass-assisted dual-comb gas sensor for multi-species detection using a free-running fiber laser. Appl. Phys. B 126, 39 (2020). https://doi.org/10.1007/s00340-020-7382-x
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DOI: https://doi.org/10.1007/s00340-020-7382-x