title: Flattop focusing with full Poincaré beams under low numerical aperture illumination.
abstract: In this Letter, we propose and experimentally demonstrate the generation of second-order full Poincaré beams and its applications in two-dimensional flattop beam shaping with spatially variant polarization under low NA focusing condition. High-quality flattop profiles with steep edge roll-off can be obtained with this technique. The experiment results also demonstrate that flattop profile can be maintained for different input beam sizes by conveniently rotating a half-wave plate.
authors.affiliation: Electro-Optics Program, University of Dayton, 300 College Park, Dayton, Ohio 45469, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Han
authors.forename: Wen
authors.initials: W
authors.lastname: Cheng
authors.forename: Qiwen
authors.initials: Q
authors.lastname: Zhan