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          Institute: MPI für Kernphysik     Collection: Theoretical Quantum Dynamics     Display Documents

ID: 299519.0, MPI für Kernphysik / Theoretical Quantum Dynamics
Light propagation through closed-loop atomic media beyond the multiphoton resonance condition
Authors:Mahmoudi, Mohammad; Evers, Jörg
Date of Publication (YYYY-MM-DD):2006-12-26
Title of Journal:Physical Review A
Journal Abbrev.:Phys. Rev. A
Start Page:1
End Page:10
Sequence Number of Article:063827
Copyright:©2006 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The light propagation of a probe field pulse in a four-level double-lambda type system driven by laser fields that form a closed interaction loop is studied. The finite frequency width of the probe pulse requires a time-dependent analysis beyond the multiphoton resonance assumption. We apply a Floquet decomposition to the equations of motion to solve this time-dependent problem and to identify the different scattering processes contributing to the medium response. We find that the response oscillating in phase with the probe field is phase-independent. The phase dependence arises from a scattering of the coupling fields into the probe field mode at a frequency which in general differs from the probe field frequency. In particular for short pulses with a large frequency width, inducing a closed loop interaction contour may lead to a distortion of the pulse shape via this phase-sensitive scattering. Finally, we demonstrate that both the closed loop and the nonclosed loop configuration allow for sub- and superluminal light propagation with small absorption or even gain, where one of the coupling field Rabi frequencies acts as a control parameter that enables one to switch between sub- and superluminal light propagation.
External Publication Status:published
Document Type:Article
Communicated by:C.H. Keitel
Affiliations:MPI für Kernphysik/ Group of C.H. Keitel/Quantum Interferences and Collective Quantum Dynamics (J. Evers)
External Affiliations:Physics Department, Zanjan University, P.O. Box 45195-313, Zanjan, Iran
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