Enhancing electromagnetically-induced transparency in a multilevel broadened medium

TL;DR

This paper investigates how to enhance electromagnetically-induced transparency (EIT) in broad, multilevel media by understanding the underlying physics and manipulating atomic velocity distributions, achieving significant transparency improvements at room temperature.

Contribution

It identifies physical mechanisms limiting EIT in broad media and demonstrates a method to enhance transparency by shaping atomic velocity distributions.

Findings

Achieved a 5-fold increase in EIT transparency in alkali-metal vapor.

Identified key physical mechanisms affecting EIT in broad, multilevel systems.

Demonstrated room-temperature enhancement of optical transparency.

Abstract

Electromagnetically-induced transparency has become an important tool to control the optical properties of dense media. However, in a broad class of systems, the interplay between inhomogeneous broadening and the existence of several excited levels may lead to a vanishing transparency. Here, by identifying the underlying physical mechanisms resulting in this effect, we show that transparency can be strongly enhanced. We thereby demonstrate a 5-fold enhancement in a room-temperature vapor of alkali-metal atoms via a specific shaping of the atomic velocity distribution.