We have observed optical precursors by studying propagation of ultrashort optical pulses with a steeply rising and an exponentially decaying trailing edge through a 0.2-{μ}m-thick GaAs crystal near the exciton resonance. The appearance of a fast pulse front---the precursor---independent of the detuning with respect to the resonance, was accompanied by a delayed main pulse. The delay of the main pulse varies with detuning in according with theoretical predictions.
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Aaviksoo et al. (1991) studied this question.
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