Resonances and excitation pathways in four-level N -scheme atomic systems

In this work, we theoretically study the absorption and dispersion coefficients of a probe field in four-level N-scheme atomic systems driven by two additional fields. We separate the steady-state solution of the appropriate density matrix element into the sum of three resonances. The effect of each...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2010-07, Vol.82 (1), Article 013834
Main Authors: Abi-Salloum, T. Y., Henry, B., Davis, J. P., Narducci, F. A.
Format: Article
Language:English
Subjects:
ABSORPTION
ATOMIC AND MOLECULAR PHYSICS
ATOMS
DENSITY MATRIX
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
MATHEMATICAL SOLUTIONS
MATRICES
OPTICAL DISPERSION
RESONANCE
SORPTION
STEADY-STATE CONDITIONS
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Summary:In this work, we theoretically study the absorption and dispersion coefficients of a probe field in four-level N-scheme atomic systems driven by two additional fields. We separate the steady-state solution of the appropriate density matrix element into the sum of three resonances. The effect of each resonance on the overall absorption and dispersion experienced by the probe is studied as a function of the strengths of the two other fields. In the limit of low saturation, we reveal the physics of these resonances and associate them with atomic excitation pathways, which we explicitly explain in the bare-states picture.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.82.013834