Superradiant Raman Laser Magnetometer

TL;DR

This paper introduces a novel magnetometer based on a superradiant Raman laser, capable of continuous and narrowband magnetic field sensing with high sensitivity, leveraging active atomic oscillations and spin-echo techniques.

Contribution

It presents a new superradiant Raman laser magnetometer that achieves wideband and narrowband magnetic field detection with quantum-limited sensitivity.

Findings

Sensitivity of 190 pT/Hz^(1/2) at 1 kHz

Effective sensing volume of 2 * 10^-3 mm^3

Demonstrates both active and passive measurement modes

Abstract

We demonstrate a proof-of-principle magnetometer that relies on the active oscillation of a cold atom Raman laser to continuously map a field-sensitive atomic phase onto the phase of the radiated light. We demonstrate wideband sensitivity during continuous active oscillation, as well as narrowband sensitivity in passive Ramsey-like mode with translation of the narrowband detection in frequency using spin-echo techniques. The sensor operates with a sensitivity of 190 pT/Hz^(1/2) at 1 kHz and effective sensing volume of 2 * 10^-3 mm^3. Fundamental quantum limits on the magnetic field sensitivity of an ideal detector are also considered.