Freiburg 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.4: Poster
Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer
Magnetometry and Thermometry with NV centers in a seeded optical cavity — •Florian Schall1, Felix A. Hahl1, Lukas Lindner1, Alexander Zaitsev2, Takeshi Ohshima3, and Jan Jeske1 — 1Fraunhofer Institute for Applied Solid State Physics, Freiburg im Breisgau, Germany — 2College of Staten Island, New York, USA — 3National Institutes for Quantum Science and Technology, Gunma, Japan
To measure magnetic fields and temperatures with NV centers in diamond, their spin-dependent fluorescence is usually monitored in an optically detected magnetic resonance (ODMR) measurement. A different approach is the concept of laser threshold magnetometry (LTM), that uses the NV centers as a laser medium. Recently researchers have demonstrated the magnetic field dependence of the stimulated emission from NV centers in a high-finesse optical cavity using a seeding laser. Based on these results we determined the strength and orientation of external magnetic fields created by a permanent magnet. Due to the high finesse of the optical cavity, we achieved high contrasts and output powers in the ODMR measurements. We also investigated the influence of laser and microwave power on diamond temperature. By specifically varying the diamond temperature, we successfully verified the well-known temperature dependence of the zero-field splitting of the NV center. Our results show the first vectorial magnetic field determination with a setup based on LTM. The investigation of the laser-induced temperature changes is highly relevant for a future integration of the setup.
Keywords: NV center; Magnetometry; Cavity; Diamond; Thermometry