Abstract
The non-linear behavior of a two-level transition driven by a strong field plays an important role in the solid state laser spectroscopy, where the transitions are normally inhomogeneously broadened. In this paper, we study phenomena associated with the lesser-known situation in the solid state where the transition between two levels has little inhomogeneous broadening. The two-level transition studied involves hyperfine levels of nitrogen-vacancy color centers in diamond and is detected by an optical-RF double resonance technique. Many interesting effects will be described, including dynamic Stark splitting, Autler-Townes splitting, gain without inversion and multiphoton transitions.
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