The role of non-resonant laser transitions in the formation and detection of a cesium beam in an atomic fountain

Yu.S. Domnin1, A.I. Magunov1, 2, V.G. Palchikov1, 3

1FGUP “VNIIFTRI”, Mendeleevo, Moscow region, Russia
2A.M. Prokhorov Institute of General Physics of the Russian Academy of Sciences, Moscow, Russia
3National Research Nuclear University MEPhI, Moscow, Russia

Al’manac of Modern Metrology № 2 (30) 2022, pages 10–19

Abstract. The population evolution of sublevels of the hyperfine structure of the 133Cs atom in laser fields is calculated taking into account resonant and nonresonant 62S1/2 Ff = 4 ↔ 62P3/2 Fe = 4,5 and 62S1/2 Fg = 3 ↔ 62P3/2 Fe = 4 transitions. Analytical expressions are obtained for the statio­nary populations of sublevels and the characteristic times of population stabilization depending on the intensity of the laser fields and the detuning of the optical resonance. It is shown that when the resonance is detuned Ff ↔ Fe = 4 by the value of the hyperfine shift relative to Fe = 5, a signify­cant fraction of atoms goes to the lower Fg sublevel in the absence of pumping at the Fg ↔ Fe = 4 resonant transition under the conditions of operation of a cloud of cold atoms and a recording system of a cesium frequency standard.

Keywords: cesium frequency standard, resonant laser fields, populations of HFS sublevels.

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