22 February 2013 Design evolution, long term performance and application tests of extra large mode area (XLMA) fiber lasers
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Abstract
XLMA fibers based on Yb-doped bulk silica possess an excellent refractive index and doping level homogeneity [1]. To achieve the highest optical-to-optical efficiency and long-term operation without degradation we simulated the effect of the brightness conversion factor of different core dopant compositions of such XLMA fibers. We also investigated the beam quality of a multi-kW single XLMA fiber laser system and its long-term stability. The current state-of-the-art XLMA single fiber laser has 5 kW maximum output power and a degradation rate of about 0.5 % / 500 h at 4 kW measured over a period of 1700 h. Several application tests demonstrate the excellent performance of the XLMA fiber laser.
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Andreas Langner, Mario Such, Gerhard Schötz, Florian Just, Martin Leich, Stephan Grimm, Jan Dellith, Matthias Jäger, Kay Schuster, Hagen Zimer, Marcin Kozak, Björn Wedel, Georg Rehmann, Charley Bachert, Volker Krause, "Design evolution, long term performance and application tests of extra large mode area (XLMA) fiber lasers", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86010G (22 February 2013); doi: 10.1117/12.2000472; https://doi.org/10.1117/12.2000472
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