Rare-earth-doped fibers have recently established themselves as an attractive and power scalable solid-state laser concept in science and industry. In his talk, "Advances in high-power fiber laser systems," Andreas Tünnermann takes a look at novel beam combination techniques which allow for increased power scaling.
Using advanced, large-mode area fibers in continuous-wave operation, output powers in the 10 kW-regime with diffraction-limited beam quality at electrical to optical efficiencies of 30 percent have been demonstrated. In the pulsed regime, average powers in the order of 1 kW even for femtosecond fiber laser systems have been reported, peak powers of fiber lasers exceed the GW-level. Novel beam combination techniques allow for further power scaling.
Tünnermann reviews the state of the art in solid state laser technology operating at high average powers with inherent high efficiencies, and discusses the prospects for future developments.
Andreas Tünnermann is Director of the Fraunhofer Institute for Applied Optics and Precision Engineering IOF (Germany).