Two-media laser threshold magnetometry: A magnetic-field-dependent laser threshold

• URL: http://arxiv.org/abs/2504.08466v2
• Date: Tue, 15 Apr 2025 11:23:31 GMT
• Title: Two-media laser threshold magnetometry: A magnetic-field-dependent laser threshold
• Authors: Yves Rottstaedt, Lukas Lindner, Florian Schall, Felix A. Hahl, Tingpeng Luo, Florentin Reiter, Takeshi Ohshima, Alexander M. Zaitsev, Roman Bek, Marcel Rattunde, Jan Jeske, Rüdiger Quay,
• Abstract summary: Nitrogen-vacancy (NV) centers in diamond are a promising platform for high-precision magnetometry.<n>Laser threshold magnetometry (LTM) exploits stimulated emission of NV centers by placing an NV-doped diamond inside an optical cavity.
• Score: 31.114245664719455
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Nitrogen-vacancy (NV) centers in diamond are a promising platform for high-precision magnetometry. In contrast to the use of spontaneous emission in a number of NV-magnetometers, laser threshold magnetometry (LTM) exploits stimulated emission of NV centers by placing an NV-doped diamond inside an optical cavity. The NV laser system is predicted to reach a high magnetic contrast and strong coherent signal strength, leading to an improved magnetic field sensitivity combined with a high linearity. Here, we consider a two-media setup where the cavity additionally includes a vertical external cavity surface emitting laser. This optically active material compensates cavity losses at 750 nm while still allowing for magnetic-field-dependent effects from the NV-diamond. We demonstrate a magnetic-field-dependent laser threshold and investigate the effects of pump laser induced absorption of the diamond. The experimental data is supported by an analytical simulation based on a rate model. Furthermore, we derive a generalized formula to compute the magnetic field sensitivity in the regime of high contrast yielding 33.79(23) pT/$\sqrt{\text{Hz}}$ for the present setup. Simulations with an optimized diamond suggest that values down to 4.9 fT/$\sqrt{\text{Hz}}$ are possible.

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