The nonlinear optical response of self-assembled quantum dots to cw driving is analyzed via numerical simulations of a spatially resolved rate equation model. The saturation is shown to follow a behavior in between the one for a dominantly, homogeneously, and inhomogeneously broadened medium. Self-lensing is suggested to probe the refractive-index nonlinearities and to open a complementary way of characterizing phase-amplitude coupling (α factor) in quantum-dots samples. For conservative assumptions on current samples the minimum focal length is predicted to be ±1.7 mm for an input beam with 15 μm radius at a detuning of 1.1 inhomogeneous linewidths from gain center.
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Tierno et al. (2009) studied this question.
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