We demonstrate all-optical nonlinearities at low cw pump powers (mW/cm²) using a GaAs/AlAs double-quantum-well design that spatially separates photoexcited electron-hole pairs. The nonlinearities are examined over a range of temperatures and in a variety of samples. Theoretical calculations based on many-body interactions are in good agreement with the measured spectra and have been used to improve the structure design.
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Galbraith et al. (1992) studied this question.
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