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The coupled spatiotemporal characteristics of subpicosecond pulses propagating in the nonlinear defocusing regime near the band edge of bulk GaAs are investigated experimentally and theoretically. We demonstrate pulse compression both in time and transverse space.
Summary form only given. We have used the strong coupling between the coherent phonon mode and the exciton in an oligomer film to produce transient bleaching of the exciton if pumped one phonon below and to observe Raman gain due to coherent phonons.
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