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Cavity ringdown spectroscopy using mid-infrared quantum-cascade lasers

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Abstract

Cavity ringdown spectra of ammonia at 10 parts in 109 by volume (ppbv) and higher concentrations were recorded by use of a 16-mW continuous-wave quantum-casacde distributed-feedback laser at 8.5 µm whose wavelength was continuously temperature tuned over 15 nm. A sensitivity (noise-equivalent absorbance) of 3.4×10-9 cm-1 Hz-1/2 was achieved for ammonia in nitrogen at standard temperature and pressure, which corresponds to a detection limit of 0.25 ppbv.

© 2000 Optical Society of America

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