Abstract
We demonstrate numerically that simultaneous second-harmonic generation and moderate group-velocity mismatch can lead to spontaneous nonlinear shortening during parametric amplification. As an experimental proof we present the results of twofold self-compression of signal pulses in a -barium borate parametric amplifier pumped by either 40- or 80-fs pulses from a Ti:sapphire laser.
© 1998 Optical Society of America
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