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An interference phenomenon in femtosecond four-wave mixing and pump-probe experiments on AlGaAs/GaAs multiple-quantum-well films is observed, which is interpreted as the interference of Rayleigh scattering field and the third-order polarization of the sample. Based on the Rayleigh scattering mode, a population relaxation time of 150 fs and a dephasing time of 44 fs of the sample are deduced. © 2003 American Institute of Physics.