Abstract

Ytterbium-doped Large Pitch Fibers with different design parameters 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 Yb-doped very 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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