Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 5: Magnetometry
Q 5.6: Talk
Monday, March 11, 2024, 12:30–12:45, HS 1221
NV-Magnetometry in a two-media laser cavity — •Yves Rottstaedt1, Lukas Lindner1, Felix A. Hahl1, Florian Schall1, Tingpeng Luo1, Roman Bek2, Jan Jeske1, and Marcel Rattunde1 — 1Fraunhofer Institute for Applied Solid State Physics, Freiburg im Breisgau, Germany — 2Twenty-One Semiconductors GmbH, Stuttgart, Germany
Laser Threshold Magnetometry (LTM) is a novel approach to measure magnetic fields with nitrogen-vacancy (NV) centres in diamonds which can enable a significant improvement in sensitivity while taking advantage of the NV magnetometry characteristics of room-temperature vector magnetometry and the ability to measure on background fields. Instead of simply collecting the photoluminescence emitted by pumping the NV centres, the idea of LTM is to build a cavity with diamond as the laser medium using the non-linear optical cavity to effectively amplify changes in the optical signal. So far it has only been achieved in an externally seeded amplification cavity due to strong absorption in the diamond.
We present an approach of building a cavity also including a second laser medium, in this case an optically pumped semiconductor disc laser. The additional gain provided by the disc laser yields an independent laser cavity for LTM with laser threshold behaviour without the need to seed the cavity externally.
Keywords: Laser Threshold Magnetometry; Diamond; Cavity; Magnetometry