[1] Liu L X, Zhou L X, Xia L J et al. Gas stable isotopic ratio mass spectrometry for measuring δ13C and δ18O in background atmospheric CO2[J]. Acta Scientiae Circumstantiae, 32, 1299-1305(2012).

[2] Kelly S, Brodie C, Hilkert A, Sun D W. Isotopic-spectroscopic technique: stable isotope-ratio mass spectrometry (IRMS)[M]. Modern techniques for food authentication, 349-413(2018).

[3] Pastor K, Ilić M, Vujić D, Pastor K et al. Gas chromatography and mass spectrometry: the technique[M]. Emerging food authentication methodologies using GC/MS, 3-31(2023).

[4] Poole C F[M]. Gas chromatography(2021).

[5] Fleisher A J, Yi H M, Srivastava A et al. Absolute 13C/12C isotope amount ratio for Vienna PeeDee Belemnite from infrared absorption spectroscopy[J]. Nature Physics, 17, 889-893(2021).

[6] Kerstel E R, Gagliardi G, Gianfrani L et al. Determination of the 2H/1H, 17O/16O, and 18O/16O isotope ratios in water by means of tunable diode laser spectroscopy at 1.39 μm[J]. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 58, 2389-2396(2002).

[7] Liu C, Xu L J, Chen J L et al. Development of a fan-beam TDLAS-based tomographic sensor for rapid imaging of temperature and gas concentration[J]. Optics Express, 23, 22494-22511(2015).

[8] Wang B, Tang X J, Gan Y Y et al. A TC/WMS-TDLAS mid-infrared detection method for ultra-low concentration carbon isotope methane[J]. Journal of Analytical Atomic Spectrometry, 37, 2615-2624(2022).

[9] Liu X, Zhang Z R, Sun P S et al. Design of high precision temperature and pressure closed-loop control system for methane carbon isotope ratio measurement by laser absorption spectroscopy[J]. Polish Journal of Environmental Studies, 31, 969-978(2021).

[10] Zhang Z R, Xia H, Sun P S et al. Stable gaseous isotope measurement method based on highly sensitive laser absorption spectroscopy and its applications[J]. Acta Photonica Sinica, 52, 0352108(2023).

[11] Zhang T Y, Liu Z W, Zhang L et al. Near-infrared laser sensor for detection of methane isotope abundance[J]. Acta Optica Sinica, 41, 1030001(2021).

[12] Sprenger M, Tetzlaff D, Soulsby C. No influence of CO2 on stable isotope analyses of soil waters with off-axis integrated cavity output spectroscopy (OA-ICOS)[J]. Rapid Communications in Mass Spectrometry, 31, 430-436(2017).

[13] Han L, Xia H, Dong F Z et al. Progress and application of cavity enhanced absorption spectroscopy technology[J]. Chinese Journal of Lasers, 45, 0911003(2018).

[14] Wang J J, Tian X, Dong Y et al. High-sensitivity off-axis integrated cavity output spectroscopy implementing wavelength modulation and white noise perturbation[J]. Optics Letters, 44, 3298-3301(2019).

[15] Wang X, Gao G Z, Long F Y et al. CO volume fraction measurement based on wavelength modulated cavity-enhanced absorption spectroscopy[J]. Chinese Journal of Lasers, 50, 1311001(2023).

[16] Li W T, Wu T, Yan H D et al. Monitoring of atmospheric CH4 and CO2 by off-axis integrating cavity output spectra based on RF white noise[J]. Acta Optica Sinica, 43, 2401013(2023).

[17] Guan S Y, Cao H L, Luo Z F et al. Review of cavity-enhanced breath diagnostics techniques[J]. Laser & Optoelectronics Progress, 59, 1900002(2022).

[18] Swinehart D F. The beer-lambert law[J]. Journal of Chemical Education, 39, 333(1962).

[19] Zhao W, Gao X, Chen W et al. Wavelength modulated off-axis integrated cavity output spectroscopy in the near infrared[J]. Applied Physics B, 86, 353-359(2007).

[20] Dong Y T, Wu Z W, Zhou W D. N2O measurement using off-axis cavity enhanced absorption spectroscopy[J]. Acta Photonica Sinica, 43, 0430003(2014).

[21] Gong D Y, Li L C, Li B Z et al. NH3 measurement based on cavity enhanced absorption spectroscopy[J]. Laser Technology, 41, 664-668(2017).

[22] Jasechko S. Global isotope hydrogeology: review[J]. Reviews of Geophysics, 57, 835-965(2019).

[23] Spokas K A, Glinski J, Horabik J, Lipiec J. Stable isotopes in evaluation of greenhouse gas emissions[M]. Encyclopedia of agrophysics, 845-849(2011).

[24] Wang J J, Tian X, Dong Y et al. Enhancing off-axis integrated cavity output spectroscopy (OA-ICOS) with radio frequency white noise for gas sensing[J]. Optics Express, 27, 30517-30529(2019).

[25] Dai R, Fritchman J C, Liu Q Y et al. Assessment of student understanding on light interference[J]. Physical Review Physics Education Research, 15, 020134(2019).

[26] Forbes A. Structured light from lasers[J]. Laser & Photonics Reviews, 13, 1900140(2019).