[1] Mchale L E, Martinez B, Miller T W et al. Open-path cavity ring-down methane sensor for mobile monitoring of natural gas emissions[J]. Optics Express, 27, 20084-20097(2019).

[2] Tang J, Li B C, Wang J. High-precision measurements of nitrous oxide and methane in air with cavity ring-down spectroscopy at 7.6 μm[J]. Atmospheric Measurement Techniques, 12, 2851-2861(2019).

[3] Maity A, Pal M, Banik G D et al. Cavity ring-down spectroscopy using an EC-QCL operating at 7.5 μm for direct monitoring of methane isotopes in air[J]. Laser Physics Letters, 14, 115701(2017).

[4] Chen Y, Lehmann K K, Peng Y et al. Hydrogen isotopic composition of arctic and atmospheric CH4 determined by a portable near-infrared cavity ring-down spectrometer with a cryogenic pre-concentrator[J]. Astrobiology, 16, 787-797(2016).

[5] Gotti R, Prevedelli M, Kassi S et al. Feed-forward coherent link from a comb to a diode laser: application to widely tunable cavity ring-down spectroscopy[J]. The Journal of Chemical Physics, 148, 054202(2018).

[6] Du X H, Xue Y, He X et al. High reflectivity measurement based on coupled cavity ring-down technique[J]. Chinese Journal of Lasers, 47, 0604006(2020).

[7] Li Z, Hu R, Xie P et al. Development of a portable cavity ring down spectroscopy instrument for simultaneous, in situ measurement of NO3 and N2O5[J]. Optics Express, 26, A433-A449(2018).

[8] Zhao G, Tan W, Hou J et al. Calibration-free wavelength-modulation spectroscopy based on a swiftly determined wavelength-modulation frequency response function of a DFB laser[J]. Optics Express, 24, 1723-1733(2016).

[9] Lin C, Hu R Z, Xie P H et al. Simultaneous measurement of nitrogen dioxide and organic nitrate based on thermal dissociation cavity ring-down spectroscopy[J]. Acta Optica Sinica, 40, 1201003(2020).

[10] Liu W Q, Wang X P, Ma G S et al. Research of high sensitivity cavity ring-down spectroscopy technology and its application[J]. Acta Optica Sinica, 41, 0130003(2021).

[11] Mondelain D, Mikhailenko S N, Karlovets E V et al. Comb-assisted cavity ring down spectroscopy of 17O enriched water between 7443 and 7921 cm-1[J]. Journal of Quantitative Spectroscopy and Radiative Transfer, 203, 206-212(2017).

[12] Mo Z Q, Yu J, Wang J D et al. Current-modulated cavity ring-down spectroscopy for mobile monitoring of natural gas leaks[J]. Journal of Lightwave Technology, 39, 4020-4027(2021).

[13] Wang M, Zhang Y F, Chen J et al. Measurement of soot particles by two-color laser-induced incandescence method combined with cavity ring-down spectroscopy[J]. Chinese Journal of Lasers, 46, 0304002(2019).

[14] Ai Y, Li J, Li Q et al. Cavity ringdown spectroscopy of nitric oxide in the ultraviolet region for human breath test[J]. Journal of Breath Research, 14, 037101(2020).

[15] De A, Banik G D, Maity A et al. Continuous wave external-cavity quantum cascade laser-based high-resolution cavity ring-down spectrometer for ultrasensitive trace gas detection[J]. Optics Letters, 41, 1949-1952(2016).

[16] Cui H B, Wang F, Huang Q X et al. Sensitive detection of NO using a compact portable CW DFB-QCL-based WMS sensor[J]. Applied Optics, 59, 9491-9498(2020).

[17] Li Q Y, Li J, Wei X et al. An exploratory study on online quantification of isoprene in human breath using cavity ringdown spectroscopy in the ultraviolet[J]. Analytica Chimica Acta, 1131, 18-24(2020).

[18] Mo Z Q, Yu J, He J G et al. Method for measurement range extension of cavity ring-down spectroscopy based on threshold modification[J]. Chinese Journal of Lasers, 47, 0804001(2020).

[19] Banik G D, Som S, Maity A et al. An EC-QCL based N2O sensor at 5.2 μm using cavity ring-down spectroscopy for environmental applications[J]. Analytical Methods, 9, 2315-2320(2017).