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Q: Fachverband Quantenoptik und Photonik
Q 72: Quantum Technologies – Color Centers II
Q 72.1: Talk
Friday, March 6, 2026, 11:00–11:15, P 5
Cavity-enhanced spectroscopy of the nitrogen-vacancy (NV−) singlet transition and pump-laser-induced effects in NV-diamonds — •Tobias Probst1, Florian Schall1, Rüdiger Quay1, Alexander M. Zaitsev2, Takeshi Ohshima3, Matthias Weidemüller4, and Jan Jeske1 — 1Fraunhofer Institute for Applied Solid State Physics IAF, Freiburg, Germany — 2College of Staten Island (CUNY), New York, USA — 3National Institutes for Quantum Science and Technology (QST), Takasaki, Japan — 4Universität Heidelberg, Heidelberg, Germany
Gaining a deeper understanding of the absorptive behavior of NV-diamonds in the near-infrared region is essential to optimize laser threshold magnetometry, as well as to improve enhanced sensing with long diamond light paths. With a tuneable Ti:Sa laser, the absorptive behavior of NV-diamonds was studied in a regime of 680-1060 nm, using a cavity to enhance the effects. The room temperature absorption of the microwave-sensitive NV− singlet transition was separated from other absorbing effects. A distinctive phonon sideband was found to exist at room temperature, while the strongest change in the measurement signal occurred at the zero phonon line at 1042 nm. Several pump-laser-induced phenomena have been observed over various diamond samples and interpreted in a broad wavelength regime. They consist of an increased or decreased absorption of the Ti:Sa wavelength when pumping the NV-diamond with a green 532 nm pump laser. Possible explanations are proposed including the charge transfer between defects following ionization processes induced by the green pump laser.
Keywords: quantum sensing; NV; magnetometry; diamond; cavity-enhanced