Absorptive laser threshold magnetometry - combining visible diamond Raman lasers and nitrogen-vacancy centres
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-06-21 |
| Journal | OPen Access Repositorium der UniversitƤt Ulm (OPARU) (Ulm University) |
| Authors | Sarath Raman Nair, Lachlan J. Rogers, David J. Spence, Richard P. Mildren, Fedor Jelezko |
| Institutions | ARC Centre of Excellence for Engineered Quantum Systems, University of Newcastle Australia |
| Citations | 12 |
Abstract
Section titled āAbstractāAbstractWe propose a high-sensitivity magnetometry scheme based on a diamond Raman laser with visible pump absorption by an ensemble of coherently microwave driven negatively charged nitrogen-vacancy centres (NVā) in the same diamond crystal. The NVā centresā absorption and emission are spin-dependent. We show how the varying absorption of the NVā centres changes the Raman laser output. A shift in the diamond Raman laser threshold and output occurs with the external magnetic field and microwave driving. We develop a theoretical framework with steady-state solutions to describe the effects of coherently driven NVā centres including the charge state switching between NVā and its neutral charge state NV0 in a diamond Raman laser. We discuss that such a laser working at the threshold can be employed for magnetic field sensing. In contrast to previous studies on NVā magnetometry with visible laser absorption, the laser threshold magnetometry method is expected to have low technical noise, due to low background light in the measurement signal. For magnetic-field sensing, we project a shot-noise limited DC sensitivity of a few pT /Hz in a well-calibrated cavity with realistic parameters. This sensor employs the broad visible absorption of NVā centres and unlike previous laser threshold magnetometry proposals it does not rely on active NVā centre lasing or an infrared laser medium at the specific wavelength of the NVā centreās infrared absorption line.