Efficient pump beam shaping for high-power thin-disk laser systems.
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.
Pereira
Rui
R
CEFITEC, Departamento de Física, FCT, Universidade Nova de Lisboa, 2825, Campus de Caparica, Portugal. r.p.pereira@gmail.com
Weichelt
Birgit
B
Liang
Dawei
D
Morais
Paulo J
PJ
Gouveia
Helena
H
Abdou-Ahmed
Marwan
M
Voss
Andreas
A
Graf
Thomas
T