Cavity enhanced absorption spectroscopy in the 10 mu m region using a waveguide CO2 laser
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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
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Journal |
Chemical Physics Letters
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Volume |
337
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Number |
4-6
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Number of Pages |
231-236
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Date Published |
Apr 6
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ISBN Number |
0009-2614
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DOI | |
PId |
1e6dd40d267da52d594ca2343b1f1d5a
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Journal Article
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