Time‐Resolved Four‐Wave Mixing in GaAs/AlAs Quantum Well Structures

Abstract

Femtosecond nonlinear laser spectroscopy is applied to study the dynamics of coherent optical excitations in semiconductors. In particular, excitonic excitations in quantum wells and superlattice structures are considered. Two examples demonstrate that four-wave mixing experiments with time-resolved detection of the nonlinear signal are able to distinguish between quantum beats and polarization interference. ') Renthof 5, W-3550 Marburg, FRG. ' ) W-7800 Freiburg, FRG. ' ) Heisenbergstr. 1, W-7000 Stuttgart, FRG.