High-sensitivity methane monitoring based on quasi-fundamental mode matched continuous-wave cavity ring-down spectroscopy

doi:10.1088/1674-1056/ac5d33

Abstract Continuous-wave cavity ring-down spectroscopy (CW-CRDS) is an important technical means to monitor greenhouse gases in atmospheric environment. In this paper, a CW-CRDS system is built to meet the needs of atmospheric methane monitoring. The problem of mode matching is explained from the perspective of transverse mode and longitudinal mode, and the influence of laser injection efficiency on measurement precision is further analyzed. The results of cavity ring-down time measurement show that the measurement precision is higher when the laser is coupled with the fundamental mode. In the experiment, DFB laser is used to calibrate the system with standard methane concentration, and the measurement residual is less than ±4×10^-4 μs^-1. The methane concentration in the air is monitored in real time for two days. The results show the consistency of the concentration changes over the two days, which further demonstrates the reliability of the system for the measurement of trace methane. By analyzing the influence of mode matching, it not only assists the adjustment of the optical path, but also further improves the sensitivity of the system measurement.

Keywords: continuous-wave cavity ring-down spectroscopy (CW-CRDS) cavity modes coupling efficiency mode matching greenhouse gas

Received: 03 December 2021
Revised: 07 March 2022
Accepted manuscript online: 14 March 2022

PACS:	42.62.Fi	(Laser spectroscopy)
	42.55.Px	(Semiconductor lasers; laser diodes)
	42.79.-e	(Optical elements, devices, and systems)
	42.25.Hz	(Interference)

Fund: This research is financial supported by the Natural National Science Foundation of China (Grant Nos. 11874364, 41877311, and 42005107), the National Key Research and Development Program of China (Grant No. 2017YFC0805004), and the CAS & Bengbu Technology Transfer Project (Grant No. ZKBB202102).

Corresponding Authors: Zhirong Zhang
E-mail: zhangzr@aiofm.ac.cn

Cite this article:

Zhe Li(李哲), Shuang Yang(杨爽), Zhirong Zhang(张志荣), Hua Xia(夏滑), Tao Pang(庞涛),Bian Wu(吴边), Pengshuai Sun(孙鹏帅), Huadong Wang(王华东), and Runqing Yu(余润磬) High-sensitivity methane monitoring based on quasi-fundamental mode matched continuous-wave cavity ring-down spectroscopy 2022 Chin. Phys. B 31 094207

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High-sensitivity methane monitoring based on quasi-fundamental mode matched continuous-wave cavity ring-down spectroscopy

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