Lezius, M.M.LeziusPenka, D.D.PenkaMelin, G.G.MelinRobin, T.T.RobinCadier, B.B.CadierKuhnhenn, JochenJochenKuhnhennWeinand, UdoUdoWeinandHolzwarth, R.R.Holzwarth2022-11-252022-11-252022https://publica.fraunhofer.de/handle/publica/42920210.1117/12.26082852-s2.0-85131215683Advanced radiation tolerant Erbium doped fibers have been developed surviving an accumulated dose of 1 kGy∗. Femtosecond fiber lasers and amplifiers manufactured from such fibers have been packaged and irradiated under active operation to test for accelerated ageing with dose rates up to 10 mGy/s using a Cobalt 60 source. The laser output power degraded by about 11% after exposure of a dose of 1 kGy. Compared to conventional Erbium fiber lasers this represents a significant improvement in radiation tolerance.enerbium doped fiber laserfrequency combradiation hardconference paper