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Negative group velocity of a light pulse in cesium vapour

A M Akulshin1, A Cimmino2 and G I Opat2

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LETTERS

Electromagnetically induced absorption in cesium vapour causes an extremely strong anomalous dispersion, leading to the propagation of radiation at a low negative group velocity Vg. As a result, a resonance light pulse appears from the medium before than a nonresonance pulse. The advance time measured in the experiment corresponds to the group velocity Vg ≈ -c/3600, which is an order of magnitude lower than that reported by Wang L.J., et al. Nature, 406, 277 (2000).


PACS

06.30.Gv Velocity, acceleration, and rotation

42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 7 (2002)



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