Resonant spectral structures of four-wave mixing (FWM) in molecular sodium are investigated. For a double- configuration with strong–weak–strong–weak fields, split components in FWM spectra induced by the strong pump fields are observed. It is shown that the split components merge into a single peak for a certain ratio of the strong field intensities. A correlation between the level-splitting effects and the saturation behavior of the FWM signal is experimentally demonstrated.
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