Optics and Spectroscopy

, Volume 119, Issue 6, pp 1038–1048 | Cite as

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
  • A. Ekers
Lasers and Their Application


The time-dependent population dynamics of hyperfine (HF) levels of n 2 p 3/2 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.


Pump Laser Rabi Frequency Cyclic Transition Alkali Atom Adiabatic Elimination 
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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • M. Bruvelis
    • 1
  • A. Cinins
    • 1
    • 2
  • A. Leitis
    • 1
  • D. K. Efimov
    • 1
    • 3
  • N. N. Bezuglov
    • 3
    • 4
  • A. S. Chirtsov
    • 3
    • 4
  • F. Fuso
    • 5
  • A. Ekers
    • 6
  1. 1.Laser CentreUniversity of LatviaRigaLatvia
  2. 2.University of LatviaInstitute of Atomic Physics and SpectroscopyRigaLatvia
  3. 3.St. Petersburg State UniversitySt. PetersburgRussia
  4. 4.ITMO UniversitySt. PetersburgRussia
  5. 5.Dipartimento di Fisica Enrico Fermi and CNISMUniversità di PisaPisaItaly
  6. 6.King Abdullah University of Science and TechnologyThuwalSaudi Arabia

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