Multicolor vortex solitons in two-dimensional photonic lattices
Multicolor vortex solitons in two-dimensional photonic lattices
We report on the existence and stability of multicolor lattice vortex solitons constituted by coupled fundamental frequency and second-harmonic waves in optical lattices in quadratic nonlinear media. It is shown that the solitons are stable almost in the entire domain of their existence, and that the instability domain decreases with …