We realize the coherent population trapping effect in ensembles of diamond NV-centers in the ground state level anticrossing regime when the sample is placed into a strong external magnetic field along the [111] crystal axis.
We demonstrate experimental results showing narrow features in room temperature optically detected magnetic resonance spectra that appear when the ground state transitions are driven by bichromatic or amplitude modulated microwave radiation. We study the dependence of the feature parameters on the intensity of optical radiation and microwave radiation power.
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