# Observation of dual electromagnetically induced transparencies in cold $^{87}Rb$ atoms

## TL;DR

This paper reports the experimental observation and theoretical modeling of two dual electromagnetically induced transparency spectra in cold rubidium atoms, demonstrating controllable spectral features via beam parameters.

## Contribution

It introduces the observation of dual EIT spectra in two different N-systems in cold rubidium atoms and models these phenomena with a density matrix approach.

## Key findings

- Dual EIT spectra observed in two N-systems.
- Spectral features can be controlled by beam strength and detuning.
- Theoretical model agrees with experimental results.

## Abstract

We have observed two dual electromagnetically induced transparency (EIT) spectra in probe transmission through cold $^{87}Rb$ atoms trapped in a magneto-optical trap (MOT). These dual EIT peaks are generated in two different N-systems formed by probe, coupling and control beams interacting with different levels in $D_{2}$ line transitions of $^{87}Rb$ atom. The dependence of spectral features of two N-systems on driving beams (\textit{i.e.} coupling and control beams) strength and detuning has been investigated. The results show that the dual EIT spectral features in both the N-systems can be manipulated by varying the strength and detuning of both the driving beams. The two N-systems have been modelled theoretically using a density matrix formalism and results have shown a reasonable agreement with the experimental observations.