Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas RID B-9041-2008
Abstract
We experimentally study the group time delay for a light pulse propagating through hot Rb-87 vapor in the presence of a strong coupling field in a Lambda configuration. We demonstrate that the ultraslow pulse propagation is transformed into superluminal propagation as the one-photon detuning of the light increases due to the change in the transmission resonance line shape. Negative group velocity as low as -c/10(6)=-80 m/s is recorded. We also find that the advance time in the regime of the superluminal propagation grows linearly with increasing laser field power.
Description
Journals published by the American Physical Society can be found at http://publish.aps.org/Subject
LIGHT-PROPAGATIONGROUP-VELOCITY
SLOW LIGHT
ATOMIC GAS
MAGNETOMETRY
ULTRASLOW
REDUCTION
MEDIA
Optics
Physics