The ultrafast relaxation of excitons in GaAs, coherently excited by a short optical pulse and subjected to collisions with free carriers and noncoherent excitons which are independently created by a second synchronized light pulse, is studied directly in the time domain by a probing of the excitonic phase coherence. The relaxation rates reveal strong exciton-exciton scattering with a collision efficiency of 1.6 ×{} 10^-4 cm³ s^-1 and even 10 times more efficient exciton-free-carrier scattering.
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Schultheis et al. (1986) studied this question.
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