Magnetometry Based on Nonlinear Magneto-Optical Rotation with Amplitude-Modulated Light

TL;DR

This paper introduces a sensitive all-optical magnetometry technique utilizing nonlinear magneto-optical rotation with amplitude-modulated light, capable of measuring magnetic fields over a broad range with high sensitivity.

Contribution

The paper presents a novel magnetometric method based on nonlinear magneto-optical rotation with amplitude-modulated light, achieving high sensitivity and broad dynamic range.

Findings

Sensitivity of 4.3×10⁻⁹ G/√Hz at 10 mG

Magnetic field tracking in a 40 mG range

Discussion of fundamental sensitivity limits

Abstract

We report on an all-optical magnetometric technique based on nonlinear magneto-optical rotation with amplitude-modulated light. The method enables sensitive magnetic-field measurements in a broad dynamic range. We demonstrate the sensitivity of $4.3\times10^{-9}$ G/$\sqrt{\text{Hz}}$ at 10 mG and the magnetic field tracking in a range of 40 mG. The fundamental limits of the method sensitivity and factors determining current performance of the magnetometer are discussed.