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Spectroscopie ultra haute résolution d'un ion unique de calcium

Abstract : This thesis is part of a project aiming at the realization of an optical frequency standard based on a single calcium ion confined in a Paul trap. Having reviewed the various types of optical frequency standards being developed (trapped neutral atoms, atoms in an optical lattice and trapped ions), emphasis is placed on the concept of a single ion confined in a radiofrequency trap. The concepts of ion trapping, laser cooling, systematic effects and laser servo techniques are studied in detail. The experimental aspect is then presented with particular emphasis on the two traps used in the experiments and the experimental protocol that is determines the specifications of the clock laser. To achieve an optical frequency standard we must have a laser source whose spectral properties are better or identical to that of the atomic transition in order to take full advantage of the quality factor of the atomic transition. All feedback systems of the laser, allowing to reach these performances are presented. In the first part, the pre-stabilization stage on an Invar cavity is presented. We can thus achieve a linewidth of arrowed 1 kHz laser. In a second part, the implementation and the installation of the second stabilization stage of the laser on a high finesse ULE cavity is detailed. Using this last stage we estimate the linewidth of the laser to be 120 MHz. The final chapter is devoted to the use of adaptive optics technology to improve the quality of laser beams and thus reduce the background noise of the ion detection system, which results in degradation of the clock stability.
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https://tel.archives-ouvertes.fr/tel-00507487
Contributor : Cedric Zumsteg <>
Submitted on : Friday, July 30, 2010 - 3:20:05 PM
Last modification on : Thursday, January 18, 2018 - 2:26:28 AM
Long-term archiving on: : Thursday, November 4, 2010 - 10:50:26 AM

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Cedric Zumsteg. Spectroscopie ultra haute résolution d'un ion unique de calcium. Physique Atomique [physics.atom-ph]. Université de Provence - Aix-Marseille I, 2010. Français. ⟨tel-00507487⟩

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