https://www.uni-ulm.de/en/nawi/institute-for-quantum-optics/group-prof-jelezko/news-details/article/reducing-inhomogeneous-broadening-of-spin-and-optical-transitions-of-nitrogen-vacancy-centers-in-high-pressure-high-temperature-diamond/
Reducing inhomogeneous broadening of spin and optical transitions of nitrogen-vacancy centers in...
inhomogeneous broadening