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Extremely robust femtosecond written fiber Bragg gratings for an ytterbium-doped fiber oscillator with 5 kW output power

 
: Krämer, R.G.; Möller, F.; Matzdorf, C.; Goebel, T.A.; Strecker, M.; Heck, M.; Richter, D.; Plötner, M.; Schreiber, T.; Tünnermann, A.; Nolte, S.

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Optics Letters 45 (2020), Nr.6, S.1447-1450
ISSN: 0146-9592
Englisch
Zeitschriftenaufsatz
Fraunhofer IOF ()

Abstract
We present highly robust fiber Bragg gratings (FBGs) in passive large-mode-area fibers for kilowatt fiber laser systems. The gratings were inscribed directly through the fiber coating using near-infrared femtosecond laser pulses and then implemented in an all-fiber ytterbium-doped single-mode oscillator setup reaching up to 5 kW signal output power. The untreated cooled FBGs showed thermal coefficients as low as 1 K kW−1, proving excellent qualification for the implementation into robust high-power fiber laser setups. © 2020 Optical Society of America

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