Abstract
We demonstrate the possibility of measuring parts in by volume concentrations of radicals of high atmospheric interest, such as or , as needed for monitoring these species in the environment. We apply cavity-enhanced absorption spectroscopy in the near UV range using a frequency-doubled mode-locked femtosecond laser. Efficient broadband injection of a high-finesse cavity is obtained by matching this optical frequency-comb source to the comb of cavity transmission resonances. A grating spectrograph and a detector array disperse and detect the spectrum transmitted by the cavity carrying the absorption features of intracavity molecules. Spectra recorded over with averaging display a noise level of .
© 2008 Optical Society of America
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