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Excitonic resonances in MQWS can be strongly affected by exciting the semiconductor in the transparency region. This optical Stark effect shows up as a blue shift of the excitonic lines associated with a reduction of the oscillator strenght and is apparent only while the electromagnetic field is present. We have studied the dependence of this shift as a function of intensity and showed in particular how its saturation is related to the oscillator strength reduction.
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Joffre et al. (1987) studied this question.
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