Articles | Volume 12, issue 3
Research article
25 Mar 2019
Research article |  | 25 Mar 2019

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

Yufeng Pan, Lei Dong, Hongpeng Wu, Weiguang Ma, Lei Zhang, Wangbao Yin, Liantuan Xiao, Suotang Jia, and Frank K. Tittel

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Cited articles

Black, E. D.: An introduction to pound–drever–hall laser frequency stabilization, Am. J. Phys., 69, 79–87, 2000. 
Chen, K., Gong, Z., and Yu, Q.: Fiber-amplifier-enhanced resonant photoacoustic sensor for sub-ppb level acetylene detection, Sensor. Actuat. A Phys., 274, 184–188, 2018. 
Drewer, R. W. P., Hall, J. L., Kowalski, F. V., Hough, J., Ford, F. M., Munley, A. J., and Ward, H.: Laser phase and frequency stabilization using an optical resonator, Appl. Phys. B, 31, 97–105, 1983. 
Gherman, T. and Romanini, D.: Mode-locked cavity- enhanced absorption spectroscopy, Opt. Express, 10, 1033–1042, 2002. 
He, Q., Zheng, C., Lou, M., Ye, W., Wang, Y., and Tittel, F. K.: Dual-feedback mid-infrared cavity-enhanced absorption spectroscopy for H2CO detection using a radio-frequency electrically-modulated interband cascade laser, Opt. Express, 26, 15436–15444, 2018. 
Short summary
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.