Group velocity study in hot Rb vapor with buffer gas

Mikhailov, Eugeniy E.; Rostovtsev, Yuri V.; Welch, George R.

Group velocity study in hot Rb vapor with buffer gas

Authors

Mikhailov, Eugeniy E.

Rostovtsev, Yuri V.

Welch, George R.

Description

We study the behavior of the group velocity of light under conditions of electromagnetically induced transparency (EIT) in a Doppler broadened medium. Specifically, we show how the group delay (or group velocity) of probe and generated Stokes fields depends on the one-photon detuning of drive and probe fields. We find that for atoms in a buffer gas the group velocity decreases with positive one-photon detuning of the drive fields, and increases when the fields are red detuned. This dependence is counter-intuitive to what would be expected if the one-photon detuning resulted in an interaction of the light with the resonant velocity subgroup.
6 pages, 7 figures