Authors: C Bahrini Y Bénilan A Jolly B Lebert X Landsheere MC Gazeau
Publish Date: 2015/11/23
Volume: 121, Issue: 4, Pages: 533-539
Abstract
We present a midinfrared pulsed cavity ringdown spectroscopy CRDS setup based on difference frequency mixing of a tunable dye laser pumped by a NdYAG laser and the residual 1064 nm pulse in a temperaturestabilized lithium niobate LiNbO3 crystal The performances of such a spectrometer have been investigated by studying the absorption spectrum of methane around 3 µm at room temperature Our results show a minimum detectable absorption coefficient of 5 × 10−8 cm−1 Our approach combines the excellent sensitivity of CRDS with the wide tunable range of difference frequency generation DFG with a dye laser However the relatively low resolution of this spectrometer prevents the quantification of methane in a wide pressure range To our knowledge we report here the first realization and application of a pulsed DFGbased CRDS experiment used for sensitive trace gas detection
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