Double-Clad Bismuth-Doped Fiber with a Rectangular Inner Cladding for Laser Application by Alexander Vakhrushev, Andrey Umnikov, Sergey Alyshev, Aleksandr Khegai, Elena Firstova, Lyudmila Iskhakova, Aleksei Guryanov, Mikhail Melkumov, Sergei Firstov

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