Absorption-free superluminal light propagation in a V-type system

TL;DR

This paper investigates how to achieve absorption-free superluminal light propagation in a three-level V-type atomic system by manipulating incoherent and coherent pump fields, revealing controllable dispersion properties.

Contribution

It demonstrates the control of dispersion slope and superluminal propagation without absorption using indirect incoherent and strong coherent pumping in a V-type system.

Findings

Dispersion slope can be switched from positive to negative.

Absorption-free subluminal and superluminal light propagation are achievable.

Control of optical properties via pump field intensities.

Abstract

Dispersion and absorption properties of a weak probe field in a three-level V-type atomic system is studied. By application of indirect incoherent pump fields the effect of populating upper levels on optical properties of the atomic medium in presence of a strong coherent pump field is investigated. It is shown that the slope of dispersion changes from positive to negative just by changing the intensity of the coherent or indirect incoherent pump fields. It is demonstrated that the absorption-free subluminal and superluminal light propagation appears in this system.