600 W power scalable single transverse mode tapered double-clad fiber laser.
Pump propagation and absorption in active tapered double-clad fiber has been analyzed based on a ray optics approach. Optimization of the longitudinal shape, absorption and angular distribution of the pump beam allowed for power scaling of a ytterbium fiber laser up to 600 W with high beam quality (M2<or=1.08) and a slope efficiency of 63%. It is shown that the influence of vignetting in a tapered fiber can be avoided, resulting in high overall efficiency, in good agreement with the presented model.
Filippov
V
V
Optoelectronics Research Centre, Tampere University of Technology, 33101 Tampere, Finland. valery.filippov@tut.fi
Chamorovskii
Y
Y
Kerttula
J
J
Kholodkov
A
A
Okhotnikov
O G
OG