Observation of the dynamic Stark effect on electromagnetically induced transparency

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Abstract
Using electron-spin-resonance transitions within the nitrogen-vacancy center in diamond, we have obtained a sharp electromagnetically induced transparency (EIT) feature when the coupling and probing fields satisfy a two-photon resonance condition. In this paper it is shown that by the application of an additional driving field the sharp EIT feature can be split into a doublet or a triplet depending on the experimental configuration. The results are interpreted in terms of dynamic Stark splitting of the EIT feature, and the spectra are shown to be related to Autler-Townes and Mollow spectra.