Nodop, D.D.NodopJauregui, C.C.JaureguiJansen, F.F.JansenLimpert, J.J.LimpertTünnermann, A.A.Tünnermann2022-03-042022-03-042010https://publica.fraunhofer.de/handle/publica/22220710.1364/OL.35.002982We report on the suppression of stimulated Raman scattering (SRS) in a double-clad fiber amplifier using long-period gratings (LPGs). The LPGs, fabricated with a CO2 laser, achieve SRS suppression by coupling the Stokes wavelength from the active core into the cladding. With only three LPGs inserted into a fiber pulse amplifier, the extractable Raman-free output power was nearly doubled. A numerical simulation of the setup shows good agreement with the experimental results.enmode operationlasergaincore620535journal article