We have studied the stimulated emission of MOVPE-grown quantum wells o
f Zn0.78Cd0.22Se, sandwiched between two thicker, zinc-richer layers.
The gain of these samples has been measured, as a function of temperat
ure, using the variable strip-length method. Its mechanism has been sh
own to be the radiative recombination of an inhomogeneously broadened
exciton system.