The evolution of fundamental beams into quadratic spatial solitons was investigated in a periodically poled bulk KTiOPO<sub>4</sub> crystal near and at phase matching. Various soliton properties, such as trapping efficiency as a function of phase mismatch, poling-induced walk-off, and the effects of pulse width, beam width, and input beam quality, were measured. Effects attributed to the presence of cubic nonlinearities were also observed.
© 2003 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
Hongki Kim, Ladislav Jankovic, George Stegeman, Silvia Carrasco, Lluis Torner, David Eger, and Mordechai Katz, "Quadratic spatial solitons in periodically poled KTiOPO4," Opt. Lett. 28, 640-642 (2003)