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Femtosecond written fiber Bragg gratings in ytterbium-doped fibers for fiber lasers in the kilowatt regime

Ria G. Krämer, Christian Matzdorf, Andreas Liem, Victor Bock, Wilko Middents, Thorsten A. Goebel, Maximilian Heck, Daniel Richter, Thomas Schreiber, Andreas Tünnermann, and Stefan Nolte

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Abstract

We investigate the high-power durability of fiber Bragg gratings written directly into an ytterbium-doped large mode area fiber using ultrashort laser pulses. The gratings were successfully integrated as a high reflector into an oscillator setup reaching up to 1.9 kW signal output power with an efficiency of 87%. Defect states induced during the inscription process could be drastically reduced by a self-annealing process resulting in a stable laser performance.

© 2019 Optical Society of America

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