High average power large-pitch fiber amplifier with robust single-mode operation |
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Authors: | Stutzki Fabian Jansen Florian Eidam Tino Steinmetz Alexander Jauregui Cesar Limpert Jens Tünnermann Andreas |
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Affiliation: | Friedrich-Schiller-University Jena, Institute of Applied Physics, Jena, Germany. fabian.stutzki@uni-jena.de |
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Abstract: | 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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