Abstract

We investigate the role of walk-off in the evolution of a weak cw wave in the anomalous-dispersion regime modulated by an intense picosecond pulse through cross-phase modulation. The cw wave can evolve into a short pulse whose duration and amplitude will depend on the degree of walk-off. When the walk-off length is shorter than necessary for short-pulse formation, the signal wave becomes amplitude modulated with a modulation depth of a few percent. In this case a frequency chirp exists in the signal wave, which can be used to generate short pulses on propagation through an appropriate dispersive element.

© 1990 Optical Society of America

Temporal behavior of cross-phase-modulated second-harmonic generation of ultrashort laser pulses in nonlinear-optical media

P. P. Ho, D. Ji, Q. Z. Wang, and R. R. Alfano
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