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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2018-457
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-457
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Jan 2019

Research article | 04 Jan 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Cavity-enhanced photoacoustic sensor based on a whispering-gallery-mode diode laser

Yufeng Pan1,2, Lei Dong1,2, Hongpeng Wu1,2, Weiguang Ma1,2, Lei Zhang1,2, Wangbao Yin1,2, Liantuan Xiao1,2, Suotang Jia1,2, and Frank K. Tittel3 Yufeng Pan et al.
  • 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
  • 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • 3Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA

Abstract. A cavity-enhanced photoacoustic (CEPA) sensor was developed based on an ultra-narrow linewidth whispering-gallery-mode (WGM) diode laser. A cavity-enhanced photoacoustic module (CEPAM) was designed to match the output beam from WGM-diode laser, resulting in an increase of the excitation light power, which, in turn, significantly enhanced the photoacoustic signal amplitude. The results show that a signal gain factor of 166 was achieved, which is in excellent agreement with the power enhancement factor of 175 after considering the power transmissivity. The performance of the sensor was evaluated in terms of the detection sensitivity and linearity. A 1σ detection limit of 0.45ppmV for C2H2 detection was obtained at atmospheric pressure with a 1-s averaging time.

Yufeng Pan et al.
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Photoacoustic spectroscopy has one important advantage: its sensitivity is proportional to the excitation light power and thus the performance of PAS-based sensors can benefit from a high excitation light power. We developed a cavity-enhanced photoacoustic sensor in which a photoacoustic cell was placed into a high finesse optical cavity. A signal gain factor of 166 was observed. For C2H2 detection, a 1σ detection limit of 0.45 ppmV was obtained at atmospheric pressure with a 1-s averaging time.
Photoacoustic spectroscopy has one important advantage: its sensitivity is proportional to the...
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