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Average power limit of Ytterbium-doped fiber-laser systems with nearly diffraction-limited beam quality

: Otto, H.-J.; Jauregui, C.; Limpert, J.; Tünnermann, A.


Ballato, J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XIII. Technology, Systems, and Applications. Proceedings : 3-18 February 2016, San Francisco, California, United States
Bellingham, WA: SPIE, 2016 (Proceedings of SPIE 9728)
ISBN: 978-1-62841-963-4
Art. 97280E
Conference "Fiber Lasers - Technology, Systems, and Applications" <13, 2016, San Francisco/Calif.>
Fraunhofer IOF ()

The maximum average power that can be emitted from an ytterbium-doped fiber-laser system is estimated. The analysis takes into account all the effects known so far that may limit the average power including transverse mode instabilities and photo darkening. Hereby, the recent experimental observation that transverse mode instabilities depend on the average heat load in a fiber amplifier is exploited. The results of this analysis show that there are three main limiting effects: stimulated Raman scattering, the brightness of the pump laser and transverse mode instabilities. Moreover, the analysis suggests that, disregarding possible practical constrains, the average output power of a fiber laser system can be, in principle, increased up to 70kW.