22 February 2017 12 mJ pulse energy 8-channel divided-pulse ultrafast fiber-laser system
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State-of-the-art ultrafast fiber lasers currently are limited in peak power by excessive nonlinearity and in average power by modal instabilities. Coherent beam combination in space and time is a successful strategy to continue power scaling by circumventing these limitations. Following this approach, we demonstrate an ultrafast fiber-laser system featuring spatial beam combination of 8 amplifier channels and temporal combination of a burst comprising 4 pulses. Active phase stabilization of this 10-armed interferometer is achieved using LOCSET and Hänsch-Couillaud techniques. The system delivers 1 kW average power at 1 mJ pulse energy, being limited by pump power, and delivers 12 mJ pulse energy at 700 W average power, being limited by optically induced damage. The system efficiency is 91% and 78%, respectively, which is due to inequalities of nonlinearity between the amplifier channels and to inequality of power and nonlinearity between the pulses within the burst. In all cases, the pulse duration is ~260 fs and the M2-value is better than 1.2. Further power scaling is possible using more amplifier channels and longer pulse bursts.
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Michael Mueller, Michael Mueller, Marco Kienel, Marco Kienel, Arno Klenke, Arno Klenke, Thomas Gottschall, Thomas Gottschall, Evgeny Shestaev, Evgeny Shestaev, Marco Plötner, Marco Plötner, Jena Limpert, Jena Limpert, Andres Tünnermann, Andres Tünnermann, } "12 mJ pulse energy 8-channel divided-pulse ultrafast fiber-laser system", Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 1008302 (22 February 2017); doi: 10.1117/12.2252335; https://doi.org/10.1117/12.2252335

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