Dynamics of stimulated emission in InAs quantum-dot laser structures measured in pump-probe experiments

Tartakovskii, A. I.; Groom, K. M.; Adawi, A. M.; Lemaı⁁tre, A.; Fox, A. M.; Mowbray, D. J.; Skolnick, M. S.; Hopkinson, M.
November 2002
Applied Physics Letters;11/25/2002, Vol. 81 Issue 22, p4118
Academic Journal
Nonlinear carrier-photon dynamics are studied for optically pumped InAs quantum-dot (QD) laser structures, using excitation into the GaAs barrier by two degenerate pump and probe laser pulses. The nonlinear emission from QDs excited by the pump pulse is further amplified by the probe excitation. By varying the delay between the two pulses, a very fast decay of the QD excited state emission is measured. Notably slower dynamics for the QD ground state are observed, governed by state filling phenomena that result in gain saturation.


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