Abstract
We performed a pump-and-probe photoluminescence excitation spectroscopy of the stimulated emission of a ${\mathrm{Zn}}_{0.7}$${\mathrm{Cd}}_{0.3}$Se single-quantum-well (SQW) struture proven to act as an efficient room-temperature laser diode under current injection. Excitonic absorption features in the excitation spectra of stimulated emission are completely bleached if the sample is simultaneously pumped by a second laser of fixed wavelength and an intensity of only 40 kW/${\mathrm{cm}}^{2}$. The stability of excitons under lasing conditions, thus, is seriously called into question in ZnSe-based SQW laser structures even at low temperatures.
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