Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas

Details Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas

2004-02-18

arxiv.org/abs/quant-ph/0402120v1

Phys. Rev. A 69, 063808 (2004)

Physics

Quantum Physics

5 pages, 6 figures

Scientific paper

10.1103/PhysRevA.69.063808

We experimentally study the group time delay for a light pulse propagating through hot Rb vapor in the presence of a strong coupling field in a $\Lambda$ configuration. We demonstrate that the ultra-slow pulse propagation is transformed into superluminal propagation as the one-photon detuning of the light increases due to the change in the transmission resonance lineshape. 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.

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