Three-photon electromagnetically induced transparency using Rydberg states

TL;DR

This paper demonstrates three-photon electromagnetically induced transparency involving Rydberg states, showing sub-Doppler spectral features and providing a theoretical model that aligns with experimental data.

Contribution

It introduces a novel four-level cascade system for EIT with Rydberg states and develops a theoretical framework for optimal parameters.

Findings

Spectral features are sub-Doppler.

Doppler shifts can be compensated by AC Stark shifts.

The theoretical model agrees with experimental results.

Abstract

We demonstrate electromagnetically induced transparency (EIT) in a four-level cascade system where the upper level is a Rydberg state. The observed spectral features are sub-Doppler and can be enhanced due to the compensation of Doppler shifts with AC Stark shifts. A theoretical description of the system is developed which agrees well with the experimental results and an expression for the optimum parameters is derived.