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2009
Journal Article
Titel
2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers
Abstract
We report on beam combining of four narrow-linewidth fiber amplifier chains, running at different wavelengths and each delivering 500 W optical output power. The main amplifier stage consists of a large mode area photonic crystal fiber. The four output beams of the amplifier chains are spectrally (incoherent) combined using a polarization-independent dielectric reflective diffraction grating to form an output beam of 2 kW continuous-wave optical power with good beam quality (M-x(2) = 2.0, M-y(2) = 1.8).