Faculté des sciences

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

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

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

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... Plus

Ajouter à la liste personnelle
    Summary
    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