Cavity enhanced wavelength modulation spectrometry for application in chemical analysis

A simple and robust absorption technique is developed which combines cavity enhanced absorption spectroscopy and wavelength modulation spectroscopy and measures the integrated output of unlocked cavities. The detection power of the technique is affected by peculiarities of the laser injection into a...

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Published inApplied physics. B, Lasers and optics Vol. 78; no. 1; pp. 103 - 109
Main Authors Zybin, A., Kuritsyn, Y.A., Mironenko, V.R., Niemax, K.
Format Journal Article
LanguageEnglish
Published 01.01.2004
Subjects
Carbon
Holes
Lasers
Microwaves
Noise
Spectrometry
Spectroscopy
Wavelength modulation
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Summary:A simple and robust absorption technique is developed which combines cavity enhanced absorption spectroscopy and wavelength modulation spectroscopy and measures the integrated output of unlocked cavities. The detection power of the technique is affected by peculiarities of the laser injection into a cavity causing excess noise which exceeds the shot noise. The noise and ways for its reduction are discussed. The new method is demonstrated by absorption measurements of excited carbon atoms in a microwave induced plasma. Preliminary detection limits equivalent to optical depths below 10 were obtained.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-003-1342-0