LASING PROPERTIES AND LASING MECHANISM IN A ZNSE/ZNSSE MULTIPLE QUANTUM-WELL HETEROSTRUCTURE

Lasing properties in a ZnSe/ZnSSe multiple quantum well heterostructure were studied quantitatively at room temperature with photopumping. The internal optical absorption loss was measured in II-VI heterostructure for the first time and it remained at the low value of 9 cm-1. The internal quantum efficiency of about 40% and the differential quantum efficiency of 28% were estimated. The lasing peaks were red shifted by about 50 meV in comparison to photoluminescence peaks measured with low excitation, and the energy separation was almost independent of the temperature. The lasing mechanism was studied by measuring the temperature and excitation-level dependencies of the emission spectra.