title: Stable multicolor periodic-wave arrays.
abstract: We study the existence and stability of periodic-wave arrays propagating in uniform quadratic nonlinear media and discover that they become completely stable above a threshold light intensity. To the best of our knowledge, this is the first example in physics of completely stable periodic-wave patterns propagating in conservative uniform media supporting bright solitons.
authors.affiliation: ICFO-Institut de Ciencies Fotoniques, and Department of Signal Theory and Communications, Universitat Politecnica de Catalunya, E-08034 Barcelona, Spain.
authors.forename: Yaroslav V
authors.initials: YV
authors.lastname: Kartashov
authors.forename: Alexey A
authors.initials: AA
authors.lastname: Egorov
authors.forename: Anna S
authors.initials: AS
authors.lastname: Zelenina
authors.forename: Victor A
authors.initials: VA
authors.lastname: Vysloukh
authors.forename: Lluis
authors.initials: L
authors.lastname: Torner