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Andreas Tünnermann
Researcher at Fraunhofer Society
Publications - 1757
Citations - 48543
Andreas Tünnermann is an academic researcher from Fraunhofer Society. The author has contributed to research in topics: Fiber laser & Laser. The author has an hindex of 97, co-authored 1738 publications receiving 43757 citations. Previous affiliations of Andreas Tünnermann include Schiller International University & University of Jena.
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100-W average-power, high-energy nanosecond fiber amplifier
TL;DR: In this paper, a fiber-based amplification of a Q-switched Nd:YAG thin-disk laser was presented, achieving up to 4 mJ with diffraction-limited beam quality in a 30-μm Yb-doped large-mode-area fiber.
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530 W, 1.3 mJ, four-channel coherently combined femtosecond fiber chirped-pulse amplification system
Arno Klenke,Sven Breitkopf,Marco Kienel,Thomas Gottschall,Tino Eidam,Steffen Hädrich,Jan Rothhardt,Jens Limpert,Andreas Tünnermann +8 more
TL;DR: A femtosecond fiber laser system comprising four coherently combined large-pitch fibers as the main amplifier and an excellent beam quality and efficiency have been obtained.
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Highly efficient transmission gratings in fused silica for chirped-pulse amplification systems
Tina Clausnitzer,Jens Limpert,Karsten Zöllner,Holger Zellmer,Hans-Joerg Fuchs,Ernst-Bernhard Kley,Andreas Tünnermann,Marco Jupé,Detlev Ristau +8 more
TL;DR: The damage threshold, extremely enhanced compared with conventional gold-coated diffraction gratings, makes these gratings the key elements in high average power (>100 W) femtosecond fiber chirped-pulse amplification systems.
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94 W 980 nm high brightness Yb-doped fiber laser
TL;DR: This work reports on the generation of 94 W continuous wave output power at 980 nm using an Yb-doped fiber laser, which is to the best of the knowledge the highest output power close to diffraction-limited beam quality achieved in this wavelength range from fibers so far.
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Discrete diffraction in two-dimensional arrays of coupled waveguides in silica
Thomas Pertsch,Ulf Peschel,F. Lederer,Jonas Burghoff,Matthias Will,Stefan Nolte,Andreas Tünnermann +6 more
TL;DR: The results reveal ideal discrete diffraction and demonstrate the excellent quality of the waveguide arrays, which were manufactured in fused silica by femtosecond-laser-induced refractive-index modifications.