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Laser continu à 205 nm : application à la mesure du déplacement de Lamb dans l'hydrogène

Abstract : The subject of this thesis is the construction of an experimental set-up, and in particular of a tunable continuous-wave laser at 205nm, for the measurement of the ground state Lamb shift in atomic hydrogen. Chapter 1 deals with the Lamb shift from a historical point of view, and with the interest of its measurement, for metrology and test of quantum electrodynamics. Chapter 2 is devoted to the theory of the hydrogen atom. The principle of the experiment is based on the comparison of two frequencies which are in a ratio four : those of the two-photon transitions of 2S-6S or 2S-6D and 1S-3S. Chapter 3 describes the experimental set-up used to measure the 2S-6D transition which is excited by a titanium-sapphire laser at 820nm. The 205nm light required to excite the 1S-3S transition is generated by two frequency-doublings of the titanium-sapphire laser, made in non-linear crystals placed in enhancement cavities. Chapter 4 is entirely devoted to the frequency-doubling. After a recall of non-linear optics, the enhancement cavities are described in detail, as well as the results we achieved. At last chapter 5 describes the research for a signal on the 1S-3S transition : the construction of a ground state atomic beam, and the development of the detection system. This work has led to a preliminary measurement of the ground state Lamb shift in atomic hydrogen : L(1S) = 8172.850 (174) MHz whose result is in very good agreement with both the previous measurements and the most recent theoretical results.
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  • HAL Id : tel-00011899, version 1

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Sophie Bourzeix. Laser continu à 205 nm : application à la mesure du déplacement de Lamb dans l'hydrogène. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1995. Français. ⟨tel-00011899⟩

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