# Pulsed high magnetic field measurement via a Rubidium vapor sensor

## TL;DR

This paper introduces a novel Rubidium vapor-based sensor for measuring pulsed high magnetic fields up to 58 Tesla, utilizing laser-induced transitions and fluorescence monitoring to improve accuracy and reduce inhomogeneity effects.

## Contribution

The authors developed a compact, fibered Rubidium vapor sensor with fluorescence detection for high-field measurements, enhancing precision over traditional methods.

## Key findings

- Successfully measured magnetic fields up to 58 T
- Demonstrated reduced inhomogeneity impact with fluorescence monitoring
- Validated the sensor's accuracy and reliability in pulsed fields

## Abstract

We present a new technique to measure pulsed magnetic fields based on the use of Rubidium in gas phase as a metrological standard. We have therefore developed an instrument based on laser inducing transitions at about 780~nm (D2 line) in a Rubidium gas contained in a mini-cell of 3~mm~x~3~mm cross section. To be able to insert such a cell in a standard high field pulsed magnet we have realized a fibred probe kept at a fixed temperature. Transition frequencies for both the $\pi$ (light polarization parallel to the magnetic field) and $\sigma$ (light polarization perpendicular to the magnetic field) configurations are measured by a commercial wavemeter. One innovation of our sensor is that in addition of monitoring the light transmitted by the Rb cell, which is usual, we also monitor the fluorescence emission of the gas sample from a very small volume with the advantage of reducing the impact of the field inhomogeneity on the field measurement. Our sensor has been tested up to about 58~T.