Absorption resonance and large negative delay in Rb vapor with buffer gas

Details Absorption resonance and large negative delay in Rb vapor with buffer gas Absorption resonance and large negative delay in Rb vapor with buffer gas

2003-09-19

arxiv.org/abs/quant-ph/0309151v2

JOSA B, Volume 21, Issue 2, 425-428 February 2004 (http://josab.osa.org/abstract.cfm?id=78824)

Physics

Quantum Physics

4 pages, 5 figures

Scientific paper

10.1364/JOSAB.21.000425

We observe a narrow, isolated, two-photon absorption resonance in Rb for large one-photon detuning in the presence of a buffer gas. In the absence of buffer gas, a standard Lambda configuration of two laser frequencies gives rise to electromagnetically induced transparency (EIT) for all values of one-photon detuning throughout the inhomogeneously (Doppler) broadened line. However, when a buffer gas is added and the one-photon detuning is comparable to or greater than the Doppler width, an absorption resonance appears instead of the usual EIT resonance. We also observe large negative group delay (~ -300 us for a Gaussian pulse propagating through the media with respect to a reference pulse not affected by the media), corresponding to a superluminal group velocity v_g= -c/(3.6x10^6)=-84 m/s.

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