Journal
OPTICS LETTERS
Volume 36, Issue 5, Pages 689-691Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.000689
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Funding
- European Research Council under the European Union [240460]
- Abbe School of Photonics Jena
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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 62 mu m. Compared to previous active large-mode area designs, the threshold of mode instabilities is increased by a factor of about 3. (C) 2011 Optical Society of America
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