title: Generation of inhomogeneously polarized laser beams by use of a Sagnac interferometer.
abstract: A principal scheme for an external cavity technique for changing the polarization of a laser beam based on a modified Sagnac interferometer is proposed. The modified Sagnac interferometer includes standard optical components: a displacement polarizing beam splitter, an angle reflector, and a Dove prism. The radially polarized beams, obtained with the help of the developed scheme, allow the generation of a longitudinally polarized electric field by sharp focusing. The phase correction of radially polarized modes of higher orders leads to increasing the longitudinal field in the focus of the beam.
authors.affiliation: National United University, Miao-Li, 36003 Taiwan. niziev@yahoo.com
authors.forename: V G
authors.initials: VG
authors.lastname: Niziev
authors.forename: R S
authors.initials: RS
authors.lastname: Chang
authors.forename: A V
authors.initials: AV
authors.lastname: Nesterov