Atomic orientation by a broadly frequency-modulated radiation: theory and experiment

TL;DR

This paper presents a comprehensive theory and experimental validation of magnetic resonances in alkali vapor driven by broad frequency-modulated laser radiation, highlighting complex hyperfine and Zeeman pumping interactions.

Contribution

It introduces a detailed model that accounts for hyperfine and Zeeman pumping effects and compares it with experimental data, revealing intricate interaction conditions.

Findings

The model accurately predicts experimental results at weak pump irradiance.

Hyperfine and Zeeman pumping interactions significantly influence magnetic resonance behavior.

Simplified models often overlook the complex interplay between pumping processes.

Abstract

We investigate magnetic resonances driven in thermal vapour of alkali atoms by laser radiation broadly modulated at a frequency resonant with the Zeeman splitting. A model accounting for both hyperfine and Zeeman pumping is developed and its results are compared with experimental measurements performed at relatively weak pump irradiance. The interplay between the two pumping processes generates intriguing interaction conditions, often overlooked by simplified models.