Abstract
The recollision model of harmonic generation in a time-varying field has two elements: the emission due to a recolliding wave packet, and the quasiperiodic emission of wave packets in successive cycles. By discussing these issues separately, we explain the origin of blueshifting, and the ‘‘smearing’’ of the harmonic spectrum. We find that such a model shares many of the qualitative features of the semiclassical theories of harmonic generation. @S1050-2947~97!09401-8#
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