Abstract

Quadratic “solitons”, generated in three-wave mixing processes, have been largely theoretically and experimentally investigated for different geometries (planar waveguide and bulk material) and types of phase matching (Type I and Type II). As well known, they emerge in nonlinear quadratic media when the input beam intensity is above a certain threshold, to make parametric gain prevail on both diffraction and walk-off, preventing the beam components from spreading in space and from separating along different directions.

© 1998 IEEE