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Demonstration of cavity enhanced FTIR spectroscopy using a femtosecond laser absorption source |
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| Authors: | S Kassi K Didriche C Lauzin X de Ghellinck d’Elseghem Vaernewijckb A Rizopoulos M Herman |
| Institution: | 1. Laboratoire de Spectrométrie Physique (associated with CNRS, UMR 5588), Université Joseph Fourier de Grenoble, B.P. 87, 38402 Saint-Martin-d’Hères Cedex, France;2. Service Laboratoire de Chimie quantique et Photophysique, CP160/09, Faculté des Sciences, Université libre de Bruxelles (U.L.B.), Ave. Roosevelt 50, B-1050 Brussels, Belgium |
| Abstract: | A proof of principle experiment was performed by recording the cavity enhanced absorption spectrum of the weak b–X transition of molecular oxygen in the atmosphere using a Ti:Sa femtosecond laser as an absorption source and a high resolution continuous scan Fourier transform interferometer. The cavity was mode matched and either continuously scanned or stabilized at the so-called magic point. An optimal rms noise equivalent absorption of 3 × 10?7 cm?1 Hz?1/2 was reached in the latter case, corresponding to αmin = 3 × 10?7 cm?1. |
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