Infrared laser magnetometry with a NV doped diamond intracavity etalon

TL;DR

This paper introduces a compact, room-temperature solid-state magnetometer using a hybrid laser with an intracavity diamond etalon doped with NV centers, achieving high sensitivity without external frequency stabilization.

Contribution

It presents a novel laser-based infrared magnetometry system leveraging intracavity NV-doped diamond, enhancing simplicity and adaptability over traditional NV center methods.

Findings

Sensitivity estimated at 250 fT/√Hz

Operates at room temperature without external laser stabilization

Applicable to various physical systems

Abstract

We propose an hybrid laser system consisting of a semiconductor external cavity laser associated to an intra-cavity diamond etalon doped with nitrogen-vacancy color centers. We consider laser emission tuned to the infrared absorption line that is enhanced under the magnetic field dependent nitrogen-vacancy electron spin resonance and show that this architecture leads to a compact solid-state magnetometer that can be operated at room-temperature. The sensitivity to the magnetic field limited by the photon shot-noise of the output laser beam is estimated to be around $250~\mathrm{fT/\sqrt{Hz}}$. Unlike usual NV center infrared magnetometry, this method would not require an external frequency stabilized laser. Since the proposed system relies on the competition between the laser threshold and an intracavity absorption, such laser-based optical sensor could be easily adapted to a broad variety of physical systems.