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High-brightness incoherent combination of fiber lasers in 7 x 1 fiber couplers at average powers > 5 kW

: Jäger, Matthias L.; Plötner, Marco; Eschrich, Tina; Vries, Oliver de; Kobelke, Jens; Schreiber, Thomas; Unger, Sonja; Eberhardt, Ramona; Bartelt, Hartmut; Tünnermann, Andreas


Journal of Lightwave Technology 33 (2015), No.20, pp.4297-4302
ISSN: 0733-8724
Journal Article
Fraunhofer IOF ()

We report on the experimental realization of two different low-loss single- to multimode fiber coupler designs, each combining more than 5 kW of output power. The adiabatic mode evolution in the seven-fiber input bundle provides a brightness close to its theoretical maximum. The all-glass structures exhibit very low heat loads mainly due to small avoidable contamination, indicating room for improvement. To the best of our knowledge, regarding all-fiber geometrical combined power generation, beam quality and heat stability, the presented results had never been reported before.