Abstract
We performed a comprehensive four-wave-mixing (FWM) study of the optical dephasing in bulk GaAs and AIGaAs with broadband 16-fs laser pulses. In contrast to previous work,1 spectral resolution has allowed us to unambiguously relate the decay of the coherent emission to either continuum or excitonic transitions. We have extended earlier measurements of continuum dephasing1-2 to one order of magnitude lower carrier densities. We find much shorter dephasing times and a much weaker density dependence of the dephasing than expected from the extrapolation of the high- density results in Ref. 1. Our data indicate that a quantum kinetics model for both Coulomb and LO-phonon scattering is required to describe continuum dephasing on the 10-fs time scale at lower densities.
© 1999 Optical Society of America
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