title: Generation and conversion of optical vortices in long-period twisted elliptical fibers.
abstract: We theoretically demonstrate that long-period twisted elliptical fibers have the ability to change in a certain wavelength range the topological charge of the incoming field by two units. We also show that such fibers can generate charge-2 optical vortices from the incoming Gaussian beams.
authors.affiliation: Taurida National V.I. Vernadsky University, Crimea, Ukraine. c.alexeyev@yandex.ua
authors.forename: Constantine N
authors.initials: CN
authors.lastname: Alexeyev
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Fadeyeva
authors.forename: Boris P
authors.initials: BP
authors.lastname: Lapin
authors.forename: Maxim A
authors.initials: MA
authors.lastname: Yavorsky