Abstract
Propagation of an intense ultrashort laser pulse in a nonlinear medium leads to a huge spectral broadening of the pulse. This phenomenon has attracted a great deal of attention in the past decade but has not yet received a satisfactory explanation. Two mechanisms, self-phase modulation1 and parametric four-wave mixing,2 have been proposed as being responsible for the spectral broadening. Neither, however, can explain fully the experimental observation.
© 1984 Optical Society of America
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