Modulation of supernarrow EIT pair via atomic coherence

TL;DR

This paper investigates how atomic coherence can modulate supernarrow EIT pairs in rubidium vapor, revealing phase-dependent transformations between EIT and EIA with potential applications in optical technologies.

Contribution

It introduces the study of phase-controlled EIT and EIA transformations in rubidium vapor, including the novel investigation of pump beam effects.

Findings

EIT and EIA can switch via phase adjustments.

Phase control enables modulation of optical transparency and absorption.

Potential applications in light storage and optical switching.

Abstract

We report the phenomena of electromagnetically induced transparency (EIT) and electromagnetically induced absorption (EIA) using two identical beams in rubidium atomic vapor. The {\Lambda}-type EIT configuration is employed to examine the EIT spectrum for the D1 line in 87Rb F=2 characteristics16 by varying parameters such as frequency detuning, Iprobe/Ipump, the total power of probe and pump beam. Notably, the pump beam is also investigated in this process, which has not been previously studied. We study the effect of of the phase between the two applied fields and find that EIA and EIT can transform into each other by adjusting the relative phase. These finding may have applications in light drag or storage, optical switching, and sensing.