title: Observation of higher-order solitons in defocusing waveguide arrays.
abstract: We observe experimentally higher-order solitons in waveguide arrays with defocusing saturable nonlinearity. Such solitons can comprise several in-phase bright spots and are stable above a critical power threshold. We elucidate the impact of the nonlinearity saturation on the domains of existence and stability of the observed complex soliton states.
authors.affiliation: Institute of Physics and Physical Technologies, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany. E.Smirnov@pe.tu-clausthal.de
authors.forename: Eugene
authors.initials: E
authors.lastname: Smirnov
authors.forename: Christian E
authors.initials: CE
authors.lastname: Rüter
authors.forename: Detlef
authors.initials: D
authors.lastname: Kip
authors.forename: Yaroslav V
authors.initials: YV
authors.lastname: Kartashov
authors.forename: Lluis
authors.initials: L
authors.lastname: Torner