Electromagnetically induced absorption in a non-degenerate three-level ladder system

TL;DR

This paper explores electromagnetically induced absorption in a non-degenerate three-level ladder system using theoretical modeling and experimental validation with rubidium atoms in a high magnetic field.

Contribution

It provides the first combined theoretical and experimental demonstration of EIA in a non-degenerate three-level ladder system under high magnetic fields.

Findings

Theoretical model predicts EIA in the system.

Experimental results confirm EIA over a wide detuning range.

Use of rubidium atoms in hyperfine Paschen-Back regime.

Abstract

We investigate, theoretically and experimentally, the transmission of light through a thermal vapour of three-level ladder-type atoms, in the presence of 2 counter-propagating control fields. A simple theoretical model predicts the presence of electromagnetically induced absorption (EIA) in this pure three-level system when the control field is resonant. Experimentally, we use $^{87}$Rb in a large magnetic field of 0.62~T to reach the hyperfine Paschen-Back regime and realise a non-degenerate three-level system. Experimental observations verify the predictions over a wide range of detunings.