Light narrowing of magnetic resonances in ensembles of nitrogen-vacancy centers in diamond
arXiv:1210.5574 · doi:10.1103/PhysRevB.87.014115
Abstract
We investigate optically detected magnetic resonance signals from an ensemble of nitrogen-vacancy centers in diamond. The signals are measured for different light powers and microwave powers, and the contrast and linewidth of the magnetic-resonance signals are extracted. For a wide range of experimental settings of the microwave and light powers, the linewidth decreases with increasing light power, and more than a factor of two "light narrowing" is observed.Furthermore, we identify that spin-spin interaction between nitrogen-vacancy centers and substitutional nitrogen atoms in the diamond leads to changes in the lineshape and the linewidth of the optically detected magnetic-resonance signals. Finally, the importance of the light-narrowing effect for optimizing the sensitivity of magnetic field measurements is discussed.
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