We predict that nearly resonant optical parametric oscillators support stable topological spatial solitons as a result of the interplay between diffraction and parametric amplification due to χ(2) nonlinearities. Robust soliton stripes are observed in two transverse dimensions. Their stability is ensured by the phase-sensitive nature of the underlying parametric process.
© 1997 Optical Society of America
Stefano Trillo, Marc Haelterman, and Adrian Sheppard, "Stable topological spatial solitons in optical parametric oscillators," Opt. Lett. 22, 970-972 (1997)