ULTRA SENSITIVE CAVITY RING DOWN SPECTROSCOPY OF MAJOR ATMOSPHERIC SPECIES BETWEEN 1.20 AND 1.71 $ \mu$m
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Date
2013
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Ohio State University
Abstract
During recent years, we have developed a fibered DFB laser CW-CRDS spectrometer providing routine noise equivalent absorption of $\alpha_{min}\approx5\times10^{-11} $cm$^{-1}$, over the 5850-8350 cm$^{-1}$ range. A detection limit of $\alpha_{min}\approx5\times10^{-13} $cm$^{-1}$ has been recently achieved by averaging spectra over a small spectral interval. The performances of this set up have allowed extending significantly the knowledge of the absorption spectra of molecules of major importance: methane, oxygen, water, ozone, carbon dioxide, hydrogen, nitrogen. The most striking results will be presented.
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Author Institution: Universite Grenoble 1/CNRS, UMR5588 \mbox{LIPhy}, Grenoble, F-38041, France