Interactions between one-dimensional quadratic soliton-like beams

The interaction between two quadratic soliton-like beams was investigated f or beams launched parallel to one another, and at small crossing angles. Th e experiments were performed in titanium in-diffused lithium niobate slab w aveguides near a Type I phase-matching condition for second harmonic genera tion (SHG). Only beams at the fundamental frequency were launched and the s econd harmonic required for quadratic soliton formation was generated upon propagation into the waveguide. The results of the interaction were found t o depend on the relative phase between the input fundamental beams, the net phase mismatch for SHG and on the beam crossing angle. Good agreement with numerical simulations of the different interactions was found. In general, the results of the interactions were similar to those found in saturable K err-like media.