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The European Physical Journal D

, Volume 59, Issue 3, pp 463–471 | Cite as

Dispersive and absorptive properties of a Λ-type atomic system with two fold lower-levels

  • M. SahraiEmail author
  • R. Etemadpour
  • M. Mahmoudi
Quantum Optics

Abstract.

The dispersion and the absorption properties of a driven four-level Λ-type atomic system is investigated. It is found that the interaction of double-dark states lead to controllable group velocity of the weak probe field by the intensity of driving field and the relative phase between applied fields. Moreover, the transient dispersion, absorption and the group index are also discussed. The required switching time for switching the group velocity of a weak probe field from subluminal to superluminal pulse propagation is then discussed.

Keywords

Group Velocity Group Index Atomic Medium Absorptive Property Spontaneously Generate Coherence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Research Institute for Applied Physics and AstronomyUniversity of TabrizTabrizIran
  2. 2.Research Institute for Fundamental SciencesTabrizIran
  3. 3.Department of PhysicsZanjan UniversityZanjanIran

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