title: Focusing and correlation properties of white-light optical vortices.
abstract: We generate double-charge white-light optical vortices by sending a circularly polarized partially incoherent light through an uniaxial crystal. We show that the generated polichromatic vortices are structurally stable, and their correlation properties can be altered by the beam focusing, resulting in changes of the vortex core visibility.
authors.forename: Vladlen
authors.initials: V
authors.lastname: Shvedov
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski
authors.forename: Alexander
authors.initials: A
authors.lastname: Volyar
authors.forename: Dragomir
authors.initials: D
authors.lastname: Neshev
authors.forename: Anton
authors.initials: A
authors.lastname: Desyatnikov
authors.forename: Yuri
authors.initials: Y
authors.lastname: Kivshar