The absorption and dispersion response of a driven NMR two-level system in diamond is investigated using Raman heterodyne technique for which both pump and probe fields are strong. Up to 11 multiphoton resonances in dispersion and up to three-photon gain without inversion in absorption are observed. These gain features can be attributed to inversion between dressed states. Futhermore, a gain feature for which there is no inversion in either bare or dressed states is observed. The results are in good agreement with calculations.
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Manson et al. (1996) studied this question.
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