Speckle-averaged resonant Rayleigh scattering from quantum well excitons

Summary form only given. We have measured the ultrafast resonant Rayleigh scattering from quantum well excitons using Fourier transform spectral interferometry. Our novel approach enables us to simultaneously measure a statistically significant number of speckles with one hundred femtosecond temporal resolution. We show that theories based on ensemble-averaging can be compared directly with the experimental resonant Rayleigh scattering dynamics. We also deduce the importance of other contributions to the total secondary emission.