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Improvement of the frequency stability below the dick limit with a continuous atomic fountain clock
Date de parution
2012
In
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Institute of Electrical and Electronics Engineers (IEEE), 2012/59/2/211-216
Résumé
The frequency instability of a shot-noise limited atomic fountain clock is inversely proportional to its signal-to- noise ratio. Therefore, increasing the atomic flux is a direct way to improve the stability. Nevertheless, in pulsed operation, the local oscillator noise limits the performance via the Dick effect. We experimentally demonstrate here that a continuous atomic fountain allows one to overcome this limitation. In this work, we take advantage of two-laser optical pumping on a cold cesium beam to increase the useful fountain flux and, thus, to reduce the frequency instability below the Dick limit. A stabil- ity of 6 • 10<sup>-14<sub> τ</sub>-1/2</sup> has been measured with the continuous cesium fountain FOCS-2.
Identifiants
Type de publication
journal article
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