We review studies on the coherent and incoherent exciton dynamics in ZnSe-based quantum wells. First, the exciton-exciton scattering parameter Is determined from femtosecond four-wave mixing as a function of back- Ground exciton density generated by a prepulse. A linear increase in the Excitonic homogeneous linewidth is found as a function of the background Exciton density with significant different scattering parameters for the cases Of interaction with coherent or incoherent excitons.
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