We report experimental and numerical results that describe collisions
between two-dimensional type II quadratic solitons excited in a KTP cr
ystal by fundamental waves of orthogonal polarization. Our results pro
vide experimental evidence of the possibility of both inelastic collis
ion (when two quadratic solitons merge at input into a single soliton
at output) and quasi-elastic collision. (C) 1998 Optical Society of Am
erica.