Abstract

Previous pump-probe studies of n=1 heavy hole exciton saturation in room temperature GaAs/AlGaAs MQWs using circular polarisations have quantified the relative contributions of phase space filling (PSF), screening and broadening [1,2]. In this work we extend the use of circular polarisations to nondegenerate studies of both n=1 and n=2 excitons in GaAs/AlGaAs MQWs employing a dual wavelength, self-modelocked Ti:sapphire laser. These results include (a) determining the PSF contribution when pumping at the light-hole exciton feature, (b) induced circular dichroism in n=2 excitons, and (c) interband relaxation times.

© 1998 IEEE