12 mJ pulse energy 8-channel divided-pulse ultrafast fiber-laser system
Mueller M, Kienel M, Klenke A, Gottschall T, Shestaev E, Ploetner M, Limpert J, Tuennermann A (2017)
Publication Type: Conference contribution
Publication year: 2017
Journal
Publisher: SPIE
Book Volume: 10083
Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering
Event location: San Francisco, CA, USA
ISBN: 9781510606074
DOI: 10.1117/12.2252335
Abstract
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.
Involved external institutions
Friedrich-Schiller-Universität Jena
Germany (DE)
Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF) / Fraunhofer Institute for Applied Optics and Precision Engineering
Germany (DE)
Germany (DE)
Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF) / Fraunhofer Institute for Applied Optics and Precision Engineering
Germany (DE)
How to cite
APA:
Mueller, M., Kienel, M., Klenke, A., Gottschall, T., Shestaev, E., Ploetner, M.,... Tuennermann, A. (2017). 12 mJ pulse energy 8-channel divided-pulse ultrafast fiber-laser system. In Ingmar Hartl, Craig A. Robin (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. San Francisco, CA, USA: SPIE.
MLA:
Mueller, Michael, et al. "12 mJ pulse energy 8-channel divided-pulse ultrafast fiber-laser system." Proceedings of the Fiber Lasers XIV: Technology and Systems 2017, San Francisco, CA, USA Ed. Ingmar Hartl, Craig A. Robin, SPIE, 2017.
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