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Interférométrie avec des lasers femtosecondes infrarouges

Abstract : For four decades, Fourier transform spectroscopy has greatly improved our atomes and molecules structures knowledges, and thus became a widely used tool for optical diagnosis. However, today it is useful to overcome some of its limitations in order to address new challenges. This thesis is about experimental developpement concerning frequency comb fourier transform spectroscopy. Two frequency combs, made of thousands of very narrow frequency lines perfectly known and controlled, are probing an absorbing sample. The fourier transform of their temporal interference pattern provides the optical spectrum. Three devices based on fiber doped lasers (emitting at 1μm and 1.5 μm) and solid lasers (at 2.4 μm) are used to demonstrate the method advantages. Compared to traditional Fourier transform spectroscopy the recording time has shrunk by one million for the acquisition of spectra spreading on a hundred of nanometers at GHz resolution. Using multipass cells of differential detection devices, the sensitivity reached is comparable to that provided by the most efficient laser based methods. Increasing the resolution allows for clear observation of the comb individual tooth which position can be measured with the accuracy of an atomic clock, providing thus a simple and accurate method for auto calibrated spectra.
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Submitted on : Tuesday, June 7, 2011 - 12:18:22 PM
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Patrick Jacquet. Interférométrie avec des lasers femtosecondes infrarouges. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112011⟩. ⟨tel-00598680⟩

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