The effect of the permanent electric-dipole moments of polar media on the two-photon resonance four-wave mixing (TPR FWM) as described by chi (3)( omega 4= omega 1- omega 2+ omega 3) is studied. The spectra corresponding to different processes of TPR FWM are modelled for a three-level system. It is demonstrated that the difference- and sum-frequency TPR FWM spectroscopy is sensitive to the difference between permanent dipole moments of the two levels coupled by the TPR.
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