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Ions calcium uniques pour un étalon de fréquence optique

Abstract : This thesis is part of a project aiming at the realisation of an optical frequency standard based on a single calcium ion confined in a Paul-Straubel trap. The first part of the manuscript is devoted to the trapping and laser cooling of the ions. The three laser sources (397 nm, 866 nm and 729 nm) used in the experiment are described in detail. To reach the Lamb-Dicke regime and to eliminate broadening by the first order Doppler effect, it is essential to reduce the ion motion. Various techniques of reduction of excess microtion are exposed, in particular a new method based on the observation of dark resonances has been set up. Numerical simulations using the density matrix allow to explain the experimental observations. A second part of the manuscript describes the experiments carried out to determine the lifetimes of the D3/2 and D5/2 levels of calcium ions. The lifetime measurement of the D5/2 level is an important stage since it allows to control and reduce the effects which could broaden the clock transition. The last part of this work is dedicated to the theoretical evaluation of the systematic effects which could influence the absolute frequency of the future standard. An optical frequency standard based on the S1/2, F=4, m_F=0 ---> D5/2, F=6, m_F=0 transition of 43Ca+ ion will be able to reach an accuracy of 4* 10^(-16).
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https://tel.archives-ouvertes.fr/tel-00009617
Contributor : Caroline Lisowski <>
Submitted on : Wednesday, June 29, 2005 - 3:29:24 PM
Last modification on : Thursday, January 18, 2018 - 2:26:39 AM
Long-term archiving on: : Friday, September 14, 2012 - 1:25:53 PM

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Caroline Lisowski. Ions calcium uniques pour un étalon de fréquence optique. Physique Atomique [physics.atom-ph]. Université de Provence - Aix-Marseille I, 2005. Français. ⟨tel-00009617⟩

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