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

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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 294W is demonstrated, while maintaining robust single-mode operation with a mode field diameter of 62μm. Compared to previous active large-mode area designs, the threshold of mode instabilities is increased by a factor of about 3.

© 2011 Optical Society of America

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