Abstract
A pulsed quantum-cascade distributed-feedback laser, temperature tunable from to , and a resonant differential photoacoustic detector are used to measure trace-gas concentrations to as low as 66 parts per by volume ammonia at a low laser power of . Good agreement between the experimental spectrum and the simulated HITRAN spectrum of is found in the spectral range between 1046 and . A detection limit of ammonia at a signal-to-noise ratio of 1 was obtained with the quantum-cascade laser (QCL) photoacoustic (PA) setup. Concentration changes of were detectable with this compact and versatile QCL-based PA detection system. The performance of the PA detector, characterized by the product of the incident laser power and the minimum detectable absorption coefficient, was .
© 2006 Optical Society of America
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