title: Stabilization of dark and vortex parametric spatial solitons.
abstract: We demonstrate that a weak defocusing Kerr effect in an optical medium with predominantly quadratic [or chi((2))] nonlinear response can eliminate the parametric modulational instability of plane waves, leading to the existence of stable two-wave dark and vortex spatial solitons.
authors: T J
authors: TJ
authors: Alexander
authors: A V
authors: AV
authors: Buryak
authors: Y S
authors: YS
authors: Kivshar