Stark shift of the Cs clock transition frequency: a new experimental approach

Robyr, J.-P.; Knowles, Paul E.; Weis, Antoine

doi:10.1109/TUFFC.2010.1455

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Journal article

Stark shift of the Cs clock transition frequency: a new experimental approach

Robyr, J.-P. Fribourg Group of Atomic Physics (FRAP), Department of Physics, University of Fribourg, Switzerland
Knowles, Paul E. Fribourg Group of Atomic Physics (FRAP), Department of Physics, University of Fribourg, Switzerland
Weis, Antoine Fribourg Group of Atomic Physics (FRAP), Department of Physics, University of Fribourg, Switzerland

04.03.2010

Published in:

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. - 2010, vol. 57, no. 3, p. 613 - 617

English The blackbody radiation shift, a manifestation of the Stark effect caused by blackbody radiation, contributes to the systematic uncertainty in Cs-based frequency standards at a level of 1 x 10⁻¹⁵. Few measurements of the third-order scalar electric polarizability of the Cs ground states, mainly responsible for the ac Stark shift in atomic clocks, have given better than 10% accuracy. We report progress in the development of a fully optical Ramsey pump-probe measurement in a thermal atomic beam, based on coherent population trapping (CPT), for the measurement of the third-order scalar and tensor polarizabilities of the Cs ground states. We give details of the apparatus and measurement techniques as well as our first 500 Hz half-period Ramsey fringes

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language