Phase-dependent interaction in a four-level atomic configuration

Giovanna Morigi, Sonja Franke-Arnold, Gian-Luca Oppo

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73 Citations (Scopus)
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We study a four-level atomic scheme interacting with four lasers in a closed-loop configuration with a ⋄ (diamond) geometry. We investigate the influence of the laser phases on the steady state. We show that, depending on the phases and the decay characteristic, the system can exhibit a variety of behaviors, including population inversion and complete depletion of an atomic state. We explain the phenomena in terms of multiphoton interference, and compare our results with the phase-dependent phenomena in the double-Λ scheme. This investigation may be useful for developing nonlinear optical devices, and for the spectroscopy and laser cooling of alkali-earth atoms.
Original languageEnglish
Article number053409
Number of pages9
JournalPhysical Review A
Issue number5
Publication statusPublished - 18 Nov 2002


  • laser
  • optics
  • physics
  • quantum physics
  • optical devices
  • atoms
  • alkali-earth atoms
  • spectroscopy
  • laser cooling
  • multiphoton interference
  • atomic configuration


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