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Cavités de haute finesse pour la spectroscopie d'absorption haute sensibilité et haute précision : Application à l'étude de molécules d'intérêt atmosphérique.

Abstract : High finesse cavities are used to measure very weak absorption features. Two different methodologies are investigated and applied to the study of molecules with atmospheric interest.
First, Continuous Wave - Cavity Ring Down Spectroscopy (CW-CRDS) is used to study the atmospheric spectra of water vapour in the near infrared range. These measurements are performed for temperature and pressure of atmospheric relevance for DIAL applications (Differential Absorption Lidar). This study, financed by the European Space Agency (ESA), goes with the WALES mission (Water Vapour Lidar Experiment in Space). The experimental setup was conceived in order to control pressure, temperature and relative humidity conditions. A particular attention is done to characterize and describe the spectrometer.
Then, measurements of red Oxygen B band are performed to demonstrate the huge performance of Optical Feedback Cavity Enhanced Absorption Spectroscopy (OF-CEAS). The desired optical feedback is obtained by light injection into the high finesse cavity through a glass plate placed inside the cavity and closed to the Brewster angle. We show a measurement dynamical range of 5 orders of magnitude (1e-5 to 1e-10 /cm) and a sensitivity of 1e-10 /cm/Hz^(1/2). Also, sampling absorption spectra by the super linear cavity frequency comb allows very precise frequency measurements. This is demonstrated by the determination of Oxygen pressure shifts with an absolute accuracy of around 5*1e-5 cm^(-1)/atm. To our knowledge, we provide the highest accuracy ever reported for this spectroscopic parameter.
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https://tel.archives-ouvertes.fr/tel-00011763
Contributor : Vincent Motto-Ros <>
Submitted on : Friday, March 31, 2006 - 2:46:26 PM
Last modification on : Monday, March 15, 2021 - 2:28:38 PM
Long-term archiving on: : Monday, September 20, 2010 - 2:26:54 PM

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Vincent Motto-Ros. Cavités de haute finesse pour la spectroscopie d'absorption haute sensibilité et haute précision : Application à l'étude de molécules d'intérêt atmosphérique.. Physique Atomique [physics.atom-ph]. Université Claude Bernard - Lyon I, 2005. Français. ⟨tel-00011763v2⟩

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