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Updated: May 30, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
Published on: July 12, 2017
High average power spectral beam combining of four fiber amplifiers to 8.2 kW
Christian Wirth1, Oliver Schmidt, Igor Tsybin
1Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein Str. 7, 07745 Jena, Germany.
Abstract:
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.
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