title: Generation of single-charge optical vortices with an uniaxial crystal.
abstract: We implement a novel experimental technique for generating mono- and polychromatic optical beams with on-axis single vortex by manipulating polarization singularities of light in birefringent crystals. We demonstrate that, in contrast to the well-known optical quadrupoles generated by beams propagating along the optical axis of a uniaxial crystal, the beam bearing isolated single-charge on-axis vortex can be generated if the incident beam is tilted with respect to the optical axis at a certain angle.
authors.forename: Alexander
authors.initials: A
authors.lastname: Voylar
authors.forename: Vladlen
authors.initials: V
authors.lastname: Shvedov
authors.forename: Tatyana
authors.initials: T
authors.lastname: Fadeyeva
authors.forename: Anton S
authors.initials: AS
authors.lastname: Desyatnikov
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar