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Sensors 2018, 18(1), 42; https://doi.org/10.3390/s18010042

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

1
School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, China
2
Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, New Territories, Hong Kong, China
3
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.
Received: 25 September 2017 / Revised: 17 December 2017 / Accepted: 19 December 2017 / Published: 25 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

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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