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 250fT/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.
@article{arxiv.1810.08253,
title = {Infrared laser magnetometry with a NV doped diamond intracavity etalon},
author = {Yannick Dumeige and Jean-François Roch and Fabien Bretenaker and Thierry Debuisschert and Victor Acosta and Christoph Becher and Georgios Chatzidrosos and Arne Wickenbrock and Lykourgos Bougas and Alexander Wilzewski and Dmitry Budker},
journal= {arXiv preprint arXiv:1810.08253},
year = {2019}
}