title: Optical vortices produced with a nonspiral phase plate.
abstract: We present simple methods to produce optical vortices on the axis of beam propagation with nonspiral phase plates. We show that a phase plate that provides linear phase retardation on one half of a laser beam produces optical vortices, which is demonstrated experimentally by use of a thickness-varying glass platelet. We also demonstrate and explain that mixed dislocations of a bent edge dislocation transform into a pair of vortices with opposing topological charges.
authors.forename: G H
authors.initials: GH
authors.lastname: Kim
authors.forename: J H
authors.initials: JH
authors.lastname: Jeon
authors.forename: K H
authors.initials: KH
authors.lastname: Ko
authors.forename: H J
authors.initials: HJ
authors.lastname: Moon
authors.forename: J H
authors.initials: JH
authors.lastname: Lee
authors.forename: J S
authors.initials: JS
authors.lastname: Chang