Abstract
Evolution of an ultrashort pulse having frequency spectrum above the band edge in a sample of GaAs has been investigated. The evolution operator technique is used for solving the wave equation under slowly varying envelope approximation coupled with the dynamic response of the medium. The pulse duration has been taken to be less than the dephasing time of the material so that there is no k mixing. Severe distortion and attenuation of pulses in the linear regime is predicted. The pulse is found to stabilize in the nonlinear regime.
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