Angular dependence of an electromagnetically induced transparency resonance in a Doppler-broadened atomic vapor

We measured the dependence of the linewidth of an electromagnetically induced transparency resonance on the angle between coupling and probe beams in an atomic cesium vapor. We observed that the nonparallelism of the beams contributes strongly to a broadening of the coherent resonance, even for smal...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2004-12, Vol.70 (6), Article 063818
Main Authors: Carvalho, P. R. S., de Araujo, Luís E. E., Tabosa, J. W. R.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
ATOMS
CESIUM
COUPLING
DOPPLER BROADENING
ENERGY LEVELS
OPACITY
PHOTON-ATOM COLLISIONS
PROBES
RESONANCE
VAPORS
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Summary:We measured the dependence of the linewidth of an electromagnetically induced transparency resonance on the angle between coupling and probe beams in an atomic cesium vapor. We observed that the nonparallelism of the beams contributes strongly to a broadening of the coherent resonance, even for small angles on the order of a few milliradians. A numerical calculation that agrees qualitatively with the experimental results is also presented. We discuss a possible application of the observed effect for performing cold-atom velocimetry.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.70.063818