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Carrier lifetimes in thin (1–2μm) CdSe (77°K) photo-excited platelet lasers measured by a mode-locked laser excitation and phase-shift technique are found to vary from τ=1.5×10−8 sec for spontaneous recombination to τ=3.3×10−10 sec for high-level stimulated recombination. High-level photopumping (n1018 cm−3) causes platelet laser oscillations to shift to longer wavelengths. This shift, which is observed to be as large as 20 meV, is attributed to many-particle interactions.
Keune et al. (Wed,) studied this question.