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High brightness spectral beam combining to 8.2 kW

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


Dawson, J.W. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers VIII: Technology, Systems, and Applications : 22.-26.1.2011, San Francisco, California, USA, SPIE Photonics West
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 7914)
ISBN: 978-0-8194-8451-2
Paper 791401
Conference "Fiber Lasers - Technology, Systems, and Applications" <8, 2011, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()
high brightness; individual fibers; large-mode-area photonic crystal fibers; main amplifiers; optical power; output beam; output power; polarization-independent; spectral beams

We report on the spectral beam combining of four narrow-linewidth fiber amplifier chains running at different wavelengths. The main amplifier stage consists of a large mode area photonic crystal fiber delivering more than 2 kW of optical power. The four output beams are geometrically (incoherent) combined using a polarization-independent dielectric reflective diffraction grating to an output power of 8.2 kW preserving the beam quality of the individual fiber amplifiers.