Abstract

Collinear phase matching of amplified colliding-pulse mode-locked (CPM) laser pulses at 620 ran in β-barium borate (BBO) for Type I parametric generation (PG) of femtosecond near infrared (ir) pulses is only possible in a narrow interval of angles between 20.3 and 20.8 degrees. This corresponds to a situation with small group velocity (GV) mismatch,1 which favors additional nonlinear processes due to the large intensity of the generated signal and idler fields.2

© 1991 Optical Society of America

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