We report here the effective suppression of stimulated Raman scattering (SRS) in a LD directly pumped 5 kW 1080 nm fiber amplifier using chirped and tilted fiber Bragg gratings (CTFBGs). The CTFBGs are carefully designed and fabricated to match the Raman gain spectrum, and experimental results show that the SRS suppression ratio is about 27.5 dB at 5 kW.

© 2020 The Author(s)

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