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Chinese Journal of Lasers, Volume. 49, Issue 4, 0411001(2022)

Mode Matching in Continuous-Wave Cavity Ring-Down Absorption Spectroscopy

Zhe Li1,2, Zhirong Zhang1,3,4、*, Hua Xia1, Pengshuai Sun1, Runqing Yu1,2, Huadong Wang1, and Bian Wu1
Author Affiliations
  • 1Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China
  • 2University of Science and Technology of China, Hefei, Anhui 230026, China
  • 3Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China
  • 4Advanced Laser Technology Laboratory of Anhui Province, National University of Defense Technology, Hefei, Anhui 230037, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (11)
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    References (19)
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    Figures & Tables(11)
    Schematic of continuous-wave cavity ring-down experiment (orange dotted line: optical fiber connection；blue solid line: wire connection)

    Fig. 1. Schematic of continuous-wave cavity ring-down experiment (orange dotted line: optical fiber connection；blue solid line: wire connection)

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    Wavelength modulation. (a) Matching between laser frequency and cavity modes; (b) schematic of frequency scanning

    Fig. 2. Wavelength modulation. (a) Matching between laser frequency and cavity modes; (b) schematic of frequency scanning

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    Schematic of cavity-length modulation. (a) Schematic of device; (b) matching between cavity mode and laser frequency; (c) schematic of frequency scanning

    Fig. 3. Schematic of cavity-length modulation. (a) Schematic of device; (b) matching between cavity mode and laser frequency; (c) schematic of frequency scanning

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    Cavity ring-down time τ0 with voltage scanning amplitude of 10, 15, 20 mV

    Fig. 4. Cavity ring-down time τ0 with voltage scanning amplitude of 10, 15, 20 mV

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    Cavity ring-down time τ0 with cavity-length scanning voltage amplitude of 40, 50, 90 V

    Fig. 5. Cavity ring-down time τ0 with cavity-length scanning voltage amplitude of 40, 50, 90 V

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    Measurement results of cavity ring-down time using two modulation methods. (a) Long-term measurement results of τ0 and its statistical distributions; (b) Allan variance analysis results

    Fig. 6. Measurement results of cavity ring-down time using two modulation methods. (a) Long-term measurement results of τ0 and its statistical distributions; (b) Allan variance analysis results

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    Ring-down curves with or without absorbing medium

    Fig. 7. Ring-down curves with or without absorbing medium

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    Measurement results of CH4 absorption spectrum under different modulations. (a) WLM; (b) CLM

    Fig. 8. Measurement results of CH4 absorption spectrum under different modulations. (a) WLM; (b) CLM

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    • Table 1. Ring-down time with different scanning amplitudes (wavelength modulation)

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      Table 1. Ring-down time with different scanning amplitudes (wavelength modulation)

      Scanning amplitude /mVRing-down time τ0 /μsStandard deviation /μs
      95.2080.065
      105.1970.087
      125.2230.087
      155.2530.053
      175.0630.122
      205.1030.150

    • Table 2. Ring-down time with different scanning amplitudes (cavity-length modulation)

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      Table 2. Ring-down time with different scanning amplitudes (cavity-length modulation)

      Scanning amplitude /V304050608090
      Ring-down time τ0 /μs5.1935.1855.2525.2175.1375.129
      Standard deviation /μs0.1620.1830.1680.1750.1770.177

    • Table 3. Comparison of Allan variance analysis results between wavelength modulation and cavity length modulation

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      Table 3. Comparison of Allan variance analysis results between wavelength modulation and cavity length modulation

      ParameterWLMCLMParameter ratio of WLM and CLM
      τ0/μs5.2395.2520.997
      Standard deviation σ0/μs0.0770.0581.328
      Best average time765967.969
      Limit of detection of absorption coefficient Δαmin /μs25.259×10-41.693×10-43.106
      Limit of detection of concentration1.64×10-90.53×10-93.094
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    Zhe Li, Zhirong Zhang, Hua Xia, Pengshuai Sun, Runqing Yu, Huadong Wang, Bian Wu. Mode Matching in Continuous-Wave Cavity Ring-Down Absorption Spectroscopy[J]. Chinese Journal of Lasers, 2022, 49(4): 0411001

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    Paper Information

    Category: spectroscopy

    Received: May. 19, 2021

    Accepted: Jun. 30, 2021

    Published Online: Jan. 18, 2022

    The Author Email: Zhang Zhirong (zhangzr@aiofm.ac.cn)

    DOI:10.3788/CJL202249.0411001

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology