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

Abstract

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.

arXiv comment5 pages, 6 figures

References in corpus (5)

• Ultra-Slow Light and Enhanced Nonlinear Optical Effects in a Coherently Driven Hot Atomic Gas
• Transparent Anomalous Dispersion and Superluminal Light Pulse Propagation at a Negative Group Velocity
• Signal velocity, causality, and quantum noise in superluminal light pulse propagation
• Phase Coherence and Control of Stored Photonic Information
• Absorption resonance and large negative delay in Rb vapor with buffer gas

Cited by in corpus (9)

• A practical guide to electromagnetically induced transparency in atomic vapor
• Buffer-gas induced absorption resonances in Rb vapor
• Photon lifetime in a cavity containing a slow-light medium
• Group velocity control in the ultraviolet domain via interacting dark-state resonances
• Demonstration of images with negative group velocities
• Controllable steep dispersion with gain in a four-level N-scheme with four-wave mixing
• Anomalous ring-down effects and breakdown of the decay rate concept in optical cavities with negative group delay
• Anomalous dispersion and negative group velocity in a coherence-free cold atomic medium
• On-resonance material fast light