SPONTANEOUS AND STIMULATED CARRIER LIFETIME AND THE SPECTRAL OUTPUT OF CdSe (77°K)

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 (n>1018 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.