Horloge atomique à piégeage cohérent de population du césium en cellule : limitations à la stabilité de fréquence

Abstract : This report refers to the frequency stability study of a compact clock using coherent population trapping. The frame of such a study is firstly to deal in depth with the understanding of the systematic effects affecting the frequency of a coherent population trapping resonance. A second goal is to build a state-of-the-art compact atomic clock. Because of a pulsed interrogation and laser beams linearly and orthogonally polarized, our prototype would present a fractional frequency stability distinctly below 10^-13 at 1 s integration if it was shot-noise limited. Further to a setup description, the first part of this report is devoted to study the noise sources which limit the short-term stability of the clock. A special attention has been paid to model, experiment and reduce the transfer of local oscillator frequency noise and of laser intensity noise to microwave frequency noise. It led to measure an interesting stability measurement at the level of 3.2x10^-13 at 1 s. An experimental and theoretical study of the frequency shift due to laser intensity fluctuation is then presented. Beyond the influence on this shift of dark resonance overlapping that has been enlighted, this study gives the basics to understand the insensibilization method of the frequency to power fluctuations presented in the last chapter.
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Jean-Marie Danet. Horloge atomique à piégeage cohérent de population du césium en cellule : limitations à la stabilité de fréquence. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066192⟩. ⟨tel-01126999⟩



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