Polarization field in optical spatial vector solitons

We report for the first time the experimental observation of polarization field in optical spatial solitons in nonlinear planar waveguide. The measurements have been checked by an improved local method (nonlinear ellipsometry method). The results confirm the uniformity of the polarization field for TE and TM solitons (in 1+1D propagation). In the case of mixed TE–TM input polarization, we have pointed out the existence of spatial vector solitons in such nonlinear waveguides. Their output polarization state distribution is uniform in the transverse section.