Ring-up-doped fiber for the generation of more than 600 W single-mode narrow-band output at 1018 nm

Palma-Vega, G.G.Palma-VegaWalbaum, T.T.WalbaumHeinzig, M.M.HeinzigKuhn, S.S.KuhnHupel, C.C.HupelHein, S.S.HeinFeldkamp, G.G.FeldkampSattler, B.B.SattlerNold, J.J.NoldHaarlammert, N.N.HaarlammertSchreiber, T.T.SchreiberEberhardt, R.R.EberhardtTünnermann, A.A.Tünnermann2022-03-062022-03-062019https://publica.fraunhofer.de/handle/publica/25900310.1364/OL.44.002502We present the amplification of a narrow-bandwidth signal at a wavelength of 1018 nm to a power exceeding 600 W with a stable output polarization state. The beam showed an excellent, nearly diffraction-limited beam quality. The high-power output could be realized using an in-house designed and fabricated fiber with a core-cladding diameter ratio of 32/260, ultra-low NA of 0.041, and ring-up doping. A seed source with high amplified spontaneous emission (ASE) suppression was also required, which was realized by a double-pass pre-amplifier with 13 W output power.en620535Ring-up-doped fiber for the generation of more than 600 W single-mode narrow-band output at 1018 nmjournal article