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High sensitivity detection of NO 2 employing cavity ringdown spectroscopy and an external cavity continuously tunable quantum cascade laser

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Abstract

A trace gas sensor for the detection of nitrogen dioxide based on cavity ringdown spectroscopy (CRDS) and a continuous wave external cavity tunable quantum cascade laser operating at room temperature has been designed, and its features and performance characteristics are reported. By measuring the ringdown times of the cavity at different concentrations of NO2, we report a sensitivity of 1.2ppb for the detection of NO2 in Zero Air.

© 2010 Optical Society of America

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