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

: Stutzki, F.; Jansen, F.; Eidam, T.; Steinmetz, A.; Jauregui, C.; Limpert, J.; Tünnermann, A.


Optics Letters 36 (2011), No.5, pp.689-691
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

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.