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High average power spectral beam combining of four fiber amplifiers to 8.2 kW

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


Optics Letters 36 (2011), No.16, pp.3118-3120
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

We report on the incoherent beam combination of the four narrow-linewidth fiber amplifier chains running at different wavelengths. Each 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 spectrally combined to a single beam with an output power of 8.2 kW using a polarization-independent dielectric reflective diffraction grating mainly preserving the beam quality of the individual fiber amplifiers.