Abstract
The nonlinear optical response of excitons strongly and coherently driven by intense laser pulses is a topic raising much interest. 1 So far, femtosecond ~fs! pump-probe experiments in free-space semiconductors, with the pump pulses tuned to the transparency region below the band gap, showed the so-called optical Stark shift of the exciton resonance. 2 Similar experimental investigations have recently reported a hyper-Raman gainon the low-energy side of the nonresonant
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