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2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers

: Wirth, C.; Schmidt, O.; Tsybin, I.; Schreiber, T.; Peschel, T.; Brückner, F.; Clausnitzer, T.; Limpert, J.; Eberhardt, R.; Tünnermann, A.; Gowin, M.; Have, E. ten; Ludewigt, K.; Jung, M.

Postprint (261 KByte; PDF; )

Optics Express 17 (2009), No.3, pp.1178-1183
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

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).