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Acousto-Optic Q-Switched Fiber Laser-Based Intra-Cavity Photoacoustic Spectroscopy for Trace Gas Detection

School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, China
Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, New Territories, Hong Kong, China
School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng 252059, China
Author to whom correspondence should be addressed.
Sensors 2018, 18(1), 42;
Received: 25 September 2017 / Revised: 17 December 2017 / Accepted: 19 December 2017 / Published: 25 December 2017
(This article belongs to the Section Physical Sensors)
We proposed a new method for gas detection in photoacoustic spectroscopy based on acousto-optic Q-switched fiber laser by merging a transmission PAS cell (resonant frequency f0 = 5.3 kHz) inside the fiber laser cavity. The Q-switching was achieved by an acousto-optic modulator, achieving a peak pulse power of ~679 mW in the case of the acousto-optic modulation signal with an optimized duty ratio of 10%. We used a custom-made fiber Bragg grating with a central wavelength of 1530.37 nm (the absorption peak of C2H2) to select the laser wavelength. The system achieved a linear response (R2 = 0.9941) in a concentration range from 400 to 7000 ppmv, and the minimum detection limit compared to that of a conventional intensity modulation system was enhanced by 94.2 times. View Full-Text
Keywords: acousto-optic modulator; Q-switching; photoacoustic spectroscopy acousto-optic modulator; Q-switching; photoacoustic spectroscopy
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Zhang, Q.; Chang, J.; Wang, Q.; Wang, Z.; Wang, F.; Qin, Z. Acousto-Optic Q-Switched Fiber Laser-Based Intra-Cavity Photoacoustic Spectroscopy for Trace Gas Detection. Sensors 2018, 18, 42.

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