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Journal of Sensors
Volume 2016 (2016), Article ID 7678315, 9 pages
http://dx.doi.org/10.1155/2016/7678315
Research Article

A Gas Cell Based on Hollow-Core Photonic Crystal Fiber (PCF) and Its Application for the Detection of Greenhouse Gas (GHG): Nitrous Oxide (N2O)

1Department of Physics, Lakehead University, 955 Oliver Road, Thunder Bay, ON, Canada P7B 5E1
2Department of Soil Science, University of Manitoba, Winnipeg, MB, Canada R3T 3N2

Received 15 September 2016; Accepted 3 November 2016

Academic Editor: Banshi D. Gupta

Copyright © 2016 Jonas K. Valiunas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The authors report the detection of nitrous oxide gas using intracavity fiber laser absorption spectroscopy. A gas cell based on a hollow-core photonic crystal fiber was constructed and used inside a fiber ring laser cavity as an intracavity gas cell. The fiber laser in the 1.55 μm band was developed using a polarization-maintaining erbium-doped fiber as the gain medium. The wavelength of the laser was selected by a fiber Bragg grating (FBG), and it matches one of the absorption lines of the gas under investigation. The laser wavelength contained multilongitudinal modes, which increases the sensitivity of the detection system. N2O gas has overtones of the fundamental absorption bands and rovibrational transitions in the 1.55 μm band. The system was operated at room temperature and was capable of detecting nitrous oxide gas at sub-ppmv concentration level.