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Robust single-mode ytterbium-doped large pitch fiber emitting 294 W

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


Dawson, J.W. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers VIII: Technology, Systems, and Applications : 22.-26.1.2011, San Francisco, California, USA, SPIE Photonics West
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 7914)
ISBN: 978-0-8194-8451-2
Paper 791417
Conference "Fiber Lasers - Technology, Systems, and Applications" <8, 2011, San Francisco/Calif.>
Fraunhofer IOF ()
Yb-doped fiber; fiber laser; fiber amplifier; high power; large mode area; single-mode

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.