title: Efficient pump beam shaping for high-power thin-disk laser systems.
abstract: We report a beam-shaping technique whereby the output power from a high-power laser-diode stack is efficiently coupled, reconfigured, and transmitted to a thin-disk laser by means of a compact optical fiber bundle. By using this technique, the power density is increased by a factor of 2 when compared to direct coupling with a octagonal fused silica rod while the numerical aperture is kept constant. Transmission efficiency of 80% was measured for the beam shaper without antireflection coating. The top-hat distribution is numerically calculated at the thin-disk laser crystal.
authors.affiliation: CEFITEC, Departamento de Física, FCT, Universidade Nova de Lisboa, 2825, Campus de Caparica, Portugal. r.p.pereira@gmail.com
authors.forename: Rui
authors.initials: R
authors.lastname: Pereira
authors.forename: Birgit
authors.initials: B
authors.lastname: Weichelt
authors.forename: Dawei
authors.initials: D
authors.lastname: Liang
authors.forename: Paulo J
authors.initials: PJ
authors.lastname: Morais
authors.forename: Helena
authors.initials: H
authors.lastname: Gouveia
authors.forename: Marwan
authors.initials: M
authors.lastname: Abdou-Ahmed
authors.forename: Andreas
authors.initials: A
authors.lastname: Voss
authors.forename: Thomas
authors.initials: T
authors.lastname: Graf