Alexander, Tristram JSaltiel, Solomon MKivshar, Yuri2015-12-130146-9592http://hdl.handle.net/1885/93478A category of parametric spatial solitons was created through multistep cascading. Parametric spatial solitons which are supported by second-harmonic generation (SHG) and at the same time sum-frequency mixing (SFM) were subjected to a SFM process-generated third wave. This third-wave prompted alterations in the parametric spatial solitons general properties and stability, making them significantly different from their forerunners. The introduction of a third wave also prompted the creation of a quasi-solitons that appear for a negative mismatch of the SFM process.Keywords: Light absorption; Nonlinear optics; Phase shift; Second harmonic generation; Parametric optical solitons; Solitons19992015-12-12