Limitations to the Short Term Frequency Stability in a Compact Cold Atom Clock

Stephane Tremine, Stephane Guerandel, David Holleville, Jerome Delporte, Noel Dimarcq, Andre Clairon

Abstract:	The HORACE device is a compact cold atom clock where about 108 cesium atoms are laser cooled at a few µK, then interrogated and detected directly in a 20 cm3 spherical microwave cavity. The optimization of the short term stability with the cooling and interrogation durations is presented, leading to an estimation of the Allan deviation of sy(t ) = 1 10-13 t -1/2 on earth and sy(t ) = 7 10-14 t -1/2 in space. The quantum projection noise, the Dick effect and the detection laser noises are taken into account. The calculations are based on a preliminary model for the recapture of cold atoms, in reasonable agreement with measurements.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	111 - 116
Cite this article:	Tremine, Stephane, Guerandel, Stephane, Holleville, David, Delporte, Jerome, Dimarcq, Noel, Clairon, Andre, "Limitations to the Short Term Frequency Stability in a Compact Cold Atom Clock," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 111-116.
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