Absorption free superluminal light propagation in a three level pump-probe system

TL;DR

This paper demonstrates that a three-level atomic system can achieve superluminal light propagation without absorption by manipulating the dispersion slope through pump field intensities.

Contribution

It introduces a method to realize absorption-free superluminal light in a three-level system by controlling pump fields, expanding potential applications in optical communications.

Findings

Dispersion slope switches from positive to negative with pump intensity.

Superluminal propagation occurs without absorption in the system.

Control of light speed via pump field manipulation.

Abstract

We investigate the dispersion and the absorption properties of a weak probe field in a three-level pump-probe atomic system. It is shown that the slope of dispersion changes from positive to negative just with the intensity of the coherent or indirect incoherent pumping fields. It is demonstrated that the absorption free superluminal light propagation is appeared in this system.