HIGH-DENSITY EFFECTS, STIMULATED-EMISSION, AND ELECTROOPTICAL PROPERTIES OF ZNCDSE ZNSE SINGLE QUANTUM-WELLS AND LASER-DIODES/

In II-VI material based laser diode structures, the role of excitonic processes for stimulated emission is still rather controversially disc ussed. In this paper, the manifestation of biexciton recombination in high-density luminescence of ZnCdSe/ZnSe quantum wells is investigated by intensity- and polarization-dependent spectroscopy. In spite of th eir evidence in such spectra, their contribution to stimulated emissio n in laser diodes with moderately confining wells is not confirmed, in stead, indication of strong Coulomb correlation is given when using th e new technique of pump-and-probe excitation spectroscopy. A strong el ectrooptic effect yielding saturation is found in laser diodes exactly at their lasing wavelength thus being promising candidates for integr ated laser-modulation devices.