A graded-index confined bismuth-doped fiber for cladding-pumped E+S-band high-power amplifiers by Oleinik, D.I., Umnikov, A.A., Abramov, A.N., Burmistrov, D.F., Vakhrushev, A.S., Alyshev, S.V., Khegai, A.M., Firstova, E.G., Melkumov, M.A., Firstov, S.V.

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