- Title
- Absorptive laser threshold magnetometry: combining visible diamond Raman lasers and nitrogen-vacancy centres
- Creator
- Raman Nair, Sarath; Rogers, Lachlan J.; Spence, David J.; Mildren, Richard P.; Jelezko, Fedor; Greentree, Andrew D.; Volz, Thomas; Jeske, Jan
- Relation
- Materials for Quantum Technology Vol. 1, Issue 2, no. 025003
- Publisher Link
- http://dx.doi.org/10.1088/2633-4356/abfd10
- Publisher
- Institute of Physics (IOP)
- Resource Type
- journal article
- Date
- 2021
- Description
- We 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 (NV⁻) in the same diamond crystal. The NV⁻ centres’ absorption and emission are spin-dependent. We show how the varying absorption of the NV⁻ 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 NV⁻ centres including the charge state switching between NV⁻ 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 NV⁻ 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 NV⁻ centres and unlike previous laser threshold magnetometry proposals it does not rely on active NV⁻ centre lasing or an infrared laser medium at the specific wavelength of the NV⁻ centre’s infrared absorption line.
- Subject
- nitrogen-vacancy centres; laser threshold magnetometry; diamond Raman laser; diamond colour centres; optical micro-cavity
- Identifier
- http://hdl.handle.net/1959.13/1440784
- Identifier
- uon:41226
- Identifier
- ISSN:2633-4356
- Language
- eng
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