DIFFER
DIFFER Publication

Cavity enhanced absorption spectroscopy in the 10 mu m region using a waveguide CO2 laser

Label Value
Author
Abstract

The cavity enhanced absorption (CEA) technique is extended into the 10 mum region using a line-tunable continuous wave CO2 laser. Part of the laser beam is deflected by an acousto-optical modulator (AOM), and is used to excite a mechanically unstable high-finesse optical cavity. In order to assure a stable and optimal transmittance of light through the cavity, the laser frequency and the cavity eigenfrequencies are modulated independently. The time-integrated intensity of the light exiting the cavity, which is inversely proportional to the cavity losses, is measured using a lock-in detection scheme. An absorption detection sensitivity of 1.5 x 10(-6) cm(-1) Hz(-1/2) is readily obtained with a rather simple setup. (C) 2001 Elsevier Science B.V. All rights reserved.

Year of Publication
2001
Journal
Chemical Physics Letters
Volume
337
Number
4-6
Number of Pages
231-236
Date Published
Apr 6
ISBN Number
0009-2614
DOI
PId
1e6dd40d267da52d594ca2343b1f1d5a
Journal Article
Download citation