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

 
: Krämer, R.G.; Matzdorf, C.; Liem, A.; Bock, V.; Middents, W.; Goebel, T.A.; Heck, M.; Richter, D.; Schreiber, T.; Tünnermann, A.; Nolte, S.

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Optics Letters 44 (2019), No.4, pp.723-726
ISSN: 0146-9592
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
03Z1H534
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
13N13654
Deutsche Forschungsgemeinschaft DFG
GRK 2101
English
Journal Article
Fraunhofer IOF ()

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.

: http://publica.fraunhofer.de/documents/N-549393.html