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Detection of nitrous oxide (N2O) at sub-ppmv using intracavity absorption spectroscopy

Valiunas, Jonas K. and Stewart, George and Das, Gautam (2016) Detection of nitrous oxide (N2O) at sub-ppmv using intracavity absorption spectroscopy. IEEE Photonics Technology Letters, 28 (3). pp. 359-362. ISSN 1041-1135

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We demonstrate a fiber laser system for the detection of the greenhouse gas, nitrous oxide (N2O), at sub-ppmv concentration levels. The fiber laser is stabilized by a saturable absorber. The sensitivity is enhanced by multiple circulations of amplified spontaneous emission light under threshold conditions, and multi-longitudinal mode oscillation of the laser. An intra-cavity Herriott cell of an effective path length of 30 m was used to detect the P (12) rotational line of N2O at ∼1522.20 nm.