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Opt Lett. 2011 Mar 1;36(5):689-91. doi: 10.1364/OL.36.000689.

High average power large-pitch fiber amplifier with robust single-mode operation.

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  • 1Friedrich-Schiller-University Jena, Institute of Applied Physics, Jena, Germany. fabian.stutzki@uni-jena.de


Ytterbium-doped large-pitch fibers with very large mode areas are investigated in a high-power fiber amplifier configuration. An average output power of 294 W is demonstrated, while maintaining robust single-mode operation with a mode field diameter of 62 μm. Compared to previous active large-mode area designs, the threshold of mode instabilities is increased by a factor of about 3.

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