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Quantum Electronics and Laser Science Conference

Slow light dynamics in warm rubidium vapor

Mark Bashkansky, Guy Beadie, Zachary Dutton, Fredrik K. Fatemi, John F. Reintjes, M. Steiner

Published Dec 10, 2005• 1 citation
Publisher

Abstract

We study slow light dynamics in Rb vapor cell. We present data showing significant pulse reshaping when the bandwidth of the pulses is increased. We present a model that qualitatively explains the observed behavior.
DOI
10.1109/qels.2005.1548732

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We study slow-light propagation dynamics in warm Rb vapor. We present data showing significant pulse reshaping when the bandwidth of the pulses is increased and present a model that qualitatively explains the observed behavior. Our data and modeling emphasize how the Doppler broadening in a warm vapor strongly affects the propagation of high-frequency components and leads to unintuitive features on the transmitted pulse shapes. This has important consequences for applications involving the delay of large-bandwidth pulses.
We study ultrabroadband slow light in a warm rubidium vapor cell. By working between the D1 and D2 transitions, we find a several-nanometer window centered at 788.4 nm in which the group index is highly uniform and the absorption is small (<1%). We demonstrate that we can control the group delay by varying the temperature of the cell, and we observe a tunable fractional delay of 18 for pulses as short as 250 fs (6.9 nm bandwidth) with a fractional broadening of only 0.65 and a power leakage of 55%. We find that a simple theoretical model is in excellent agreement with the experimental results. Using this model, we discuss the impact of the pulse’s spectral characteristics on the distortion it incurs during propagation through the vapor.