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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
High sensitivity detection of NO2 employing cavity ringdown spectroscopy and an external cavity continuously tunable
Gottipaty N Rao1, Andreas Karpf
1Department of Physics, Adelphi University, Garden City, New York 11530, USA. Rao@adelphi.edu
Applied Optics
|September 11, 2010
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 NO(2), we report a sensitivity of 1.2 ppb for the detection of NO(2) in Zero Air.

