The concept of the guiding-center walking soliton is introduced for examination of self-trapping of light in quadratic nonlinear media in materials with large Poynting vector walk-off. It is shown that robust guiding-center solitons exist in properly constructed tandem structures. The goal is to form quadratic solitons with reduced light intensities.
Torner, L. Guiding-center walking soliton. "Optics letters", Agost 1998, vol. 23, núm. 16, p. 1256-1258.