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Magnetic-field-dependent stimulated emission from nitrogen-vacancy centers in diamond
Felix A Hahl1, Lukas Lindner1, Xavier Vidal1
1Fraunhofer-Institut für Angewandte Festkörperphysik (IAF), Tullastrasse 72, 79108 Freiburg, Germany.
Science Advances
|June 3, 2022
Summary
We demonstrated laser threshold magnetometry using nitrogen-vacancy (NV) centers in diamond, achieving a 33% contrast magnetic field sensor. This quantum sensing technique significantly enhances sensitivity for health, research, and mining applications.
Area of Science:
- Quantum sensing
- Diamond quantum defects
- Optics and photonics
Background:
- Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors for magnetic fields.
- Laser threshold magnetometry theory suggests enhanced sensitivity through increased signal and contrast.
- Experimental validation of this theory is crucial for advancing quantum sensing technology.
Purpose of the Study:
- To experimentally demonstrate laser threshold magnetometry using NV centers in diamond.
- To investigate the magnetic field dependency of stimulated emission from NV centers.
- To assess the potential for improved magnetic field sensing sensitivity.
Main Methods:
- Utilized a macroscopic high-finesse laser cavity with a highly NV-doped diamond gain medium.
- Pumped the diamond at 532 nm and seeded resonantly at 710 nm.
- Measured magnetic field-dependent amplification and stimulated emission.
Main Results:
- Achieved a 64% signal power amplification via stimulated emission.
- Demonstrated magnetic field-dependent stimulated emission from the NV center ensemble.
- Observed an ultrahigh contrast of 33% and milliwatt-level output power.
Conclusions:
- Laser threshold magnetometry with NV centers enables enhanced magnetic field sensing.
- Coherent readout of NV centers opens new avenues for cavity and laser applications.
- This technique promises substantially improved sensitivity for health, research, and mining sectors.
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