Cavity ringdown spectroscopy using mid-infrared quantum-cascade lasers

Cavity ringdown spectra of ammonia at 10 parts in 10(9) by volume (ppbv) and higher concentrations were recorded by use of a 16-mW continuous-wave quantum-casacde distributed-feedback laser at 8.5 mum whose wavelength was continuously temperature tuned over 15 nm. A sensitivity (noise-equivalent abs...

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Bibliographic Details
Published in:Optics letters 2000-05, Vol.25 (9), p.666-668
Main Authors: Paldus, B A, Harb, C C, Spence, T G, Zare, R N, Gmachl, C, Capasso, F, Sivco, D L, Baillargeon, J N, Hutchinson, A L, Cho, A Y
Format: Article
Language:English
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Summary:Cavity ringdown spectra of ammonia at 10 parts in 10(9) by volume (ppbv) and higher concentrations were recorded by use of a 16-mW continuous-wave quantum-casacde distributed-feedback laser at 8.5 mum whose wavelength was continuously temperature tuned over 15 nm. A sensitivity (noise-equivalent absorbance) of 3.4x10(-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.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.25.000666