Abstract
X-pulses (the radial analogous of tilted pulses) are known from linear optics since they sustain propagation with constant spatio-temporal profile in normal dispersive media [1], Here we show that X pulses are formed spontaneously from a gaussian beam/pulse under SHG with positive mismatch (2kω>k2ω) and normal dispersion.
© 2001 Optical Society of America
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