title: Observation of polychromatic vortex solitons.
abstract: We demonstrate experimentally the formation of polychromatic single- and double-charge optical vortex solitons by employing a lithium niobate crystal as a nonlinear medium with defocusing nonlinearity. We study the wavelength dependence of the vortex core localization and observe self-trapping of polychromatic vortices with a bandwidth spanning over more than 70 nm for single-charge and 180 nm for double-charge vortex solitons.
authors: Nonlinear Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT, Australia. dnn@rsphysse.anu.edu.au
authors: Dragomir N
authors: DN
authors: Neshev
authors: Alexander
authors: A
authors: Dreischuh
authors: Vladlen
authors: V
authors: Shvedov
authors: Anton S
authors: AS
authors: Desyatnikov
authors: Wieslaw
authors: W
authors: Krolikowski
authors: Yuri S
authors: YS
authors: Kivshar