The nonlinear optical properties of semiconductors, which are excited by a strong laser pulse at the excitonic resonance are investigated. The concepts to describe the time‐evolution of the initially coherently excited system in the framework of a nonequilibrium Green's function theory are discussed in general. Numerical results are presented for a quasistationary limit and compared with recent experimental data.
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Schäfer et al. (1988) studied this question.
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