I. Shtrichman et al., Dynamics of carriers in resonantly excited quantum-well lasers studied by intersubband absorption, APPL PHYS L, 76(21), 2000, pp. 2988-2990
Using infrared picosecond pulses to probe the intersubband absorption of Ga
As/AlGaAs quantum-well lasers following their optical excitation, we direct
ly measure the dynamics of carriers in these devices. We find no evidence f
or excitonic gain even at cryogenic temperatures and resonant excitonic exc
itation. (C) 2000 American Institute of Physics. [S0003-6951(00)05221-9].