Atomic-signal-based zero field finding technique for unshielded laser-pumped atomic magnetometer

TL;DR

This paper introduces a novel atomic-signal-based method to quickly locate the zero magnetic field in unshielded laser-pumped atomic magnetometers, enhancing their practical usability.

Contribution

It presents a new technique that uses atomic signals to efficiently find the zero magnetic field without shielding, with rapid convergence and high precision.

Findings

Zero-field found in less than 18 seconds

Step length after convergence is below 10nT for x and y axes, 40nT for z axis

Method effective under 50Hz environmental noise

Abstract

We described a novel technique that can find the zero-field for unshielded laser-pumped atomic magnetometer using atomic signal itself. By comparing light density of pump beam after atomic vapor cell, it is decided which direction to move the compensation magnetic field and whether to increase or decrease the converging step length. The zero-field is found in less than 18s and the step length after converging is smaller than 10nT, 10nT and 40nT for x, y and z axes, respectively, limited by 50Hz noise in the lab environment.