Particularities of optical pumping effects in cold and ultra-slow beams of Na and Cs in the case of cyclic transitions

M. Bruvelis, A. Cinins, A. Leitis, D. K. Efimov, N. N. Bezuglov, A. S. Chirtsov, F. Fuso, Aigars Ekers

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2 Scopus citations


The time-dependent population dynamics of hyperfine (HF) levels of n2p3/2 states is examined for cyclic transitions in alkali atoms. We study a slow and cold atomic beam of Na (n = 3) and Cs (n = 6), taking into account the long interaction time of light with atoms (~200 μs) inside the resonant laser beam. Simple analytical expressions for the populations of the excited states and for the intensities of the absorption lines are derived for a three-level system model. We show that at moderate pump laser power the mixing of HF levels is sufficient to form a flow of population from a cyclic transition to partially open transitions. We discuss various phenomena associated with the evolution of optical pumping that cannot be explained by general analysis of two-level system model.
Original languageEnglish (US)
Pages (from-to)1038-1048
Number of pages11
JournalOptics and Spectroscopy
Issue number6
StatePublished - Dec 9 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the Government of the Russian Federation Grant 074-U01, with partial funding from the European Commission projects EU FP7 IAPP COLDBEAM and EU FP7 Centre of Excellence FOTONIKA-LV (REGPOT-CT-2011-285912-FOTONIKA), and the US Office of Naval Research Grant No. N00014-12-1-0514.


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