Hyperfine Paschen-Back regime realized in Rb nanocell

TL;DR

This paper demonstrates a simple method to observe the hyperfine Paschen-Back regime in rubidium atoms using a nanocell and strong magnets, with results aligning with theoretical predictions and potential applications in high-resolution magnetometry.

Contribution

It introduces a novel experimental setup using a nanocell and permanent magnets to directly observe the hyperfine Paschen-Back regime in Rb atoms.

Findings

Successful observation of hyperfine Paschen-Back regime in Rb D1 line.

Consistent experimental results with theoretical predictions.

Potential for high-resolution magnetometry applications.

Abstract

A simple and efficient scheme based on one-dimensional nanometric thin cell filled with Rb and strong permanent ring magnets allowed direct observation of hyperfine Paschen-Back regime on D1 line in 0.5 - 0.7 T magnetic field. Experimental results are perfectly consistent with the theory. In particular, with sigma+ laser excitation, the slopes of B-field dependence of frequency shift for all the 10 individual transitions of 85,87Rb are the same and equal to 18.6 MHz/mT. Possible applications for magnetometry with submicron spatial resolution and tunable atomic frequency references are discussed.