We investigate the stimulated emission properties of an In0.18Ga0.82As
/GaAs quantum-well microcavity laser under strong magnetic confinement
. The dynamics depend sensitively on excitation intensity and cavity m
ode energy, but show no magnetic-field dependence over a wide range of
excitation conditions. The results evidence a fast relaxation which i
s uninhibited by the quasi-three-dimensional quantum confinement, and
may indicate an advantage in designing quantum dots with equidistant e
nergy levels, where Coulomb scattering via an Anger process is expecte
d to be highly efficient.