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Horloge à réseau optique au Strontium : une 2ème génération d'horloges à atomes froids

Abstract : Atomic fountains, based on a microwave transition of Cesium or Rubidium, constitute the state of the art atomic clocks, with a relative accuracy close to 10^-16. However, at present, it appears that it will be difficult to go significantly beyond this level with this kind of device. The use of an optical transition, the other parameters being unchanged, gives hope for a 4 or 5 order of magnitude improvement of the stability and of the relative uncertainty on most systematic effects. As for motional effects on the atoms, they can be controlled on a very different manner if they are trapped in an optical lattice instead of experiencing a free ballistic flight stage, characteristic of the fountains. The keystone of this approach lies in the fact that the trap can be operated in such a way that a well chosen and weakly allowed J = 0 -> J = 0 clock transition can be set free of light shift effects. In this respect, the strontium atom is one of the most promising candidates, the 1^S_0 -> 3^P_0 transition has a natural width of 1 mHz, and several other easily accessible transitions can be used to efficiently laser cool atoms down to 10 microK. This thesis demonstrates the experimental feasibility of an optical lattice clock based on the strontium atom, and reports on a preliminary evaluation of the relative accuracy with the fermionic isotope 87^Sr, at a level of a few 10^-15.
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Contributor : Rodolphe Le Targat <>
Submitted on : Thursday, January 6, 2011 - 9:40:55 PM
Last modification on : Thursday, April 2, 2020 - 1:28:26 PM
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  • HAL Id : pastel-00553253, version 1

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Rodolphe Le Targat. Horloge à réseau optique au Strontium : une 2ème génération d'horloges à atomes froids. Physique Atomique [physics.atom-ph]. Télécom ParisTech, 2007. Français. ⟨pastel-00553253⟩

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