Abstract
Dephasing of nonlinear optical polarization in PbI 2 is investigated in the exciton resonant region by spectrally-resolved four-wave mixing (FWM) spectroscopy with subpicosecond time resolution. It is found that FWM spectra show the structures due to both exciton and biexciton nonlinearities and depend significantly on the polarization and the energy of excitation pulse. The experimental results are qualitatively explained by the four-level model which takes into account a biexciton level as well as an exciton one. It is suggested that the dispersion effect of exciton polaritons plays a role in the time response of FWM signal.
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