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Fibre amplifier based on an ytterbium-doped active tapered fibre for the generation of megawatt peak power ultrashort optical pulses, Koptev, M.Yu., Anashkina, E.A., Bobkov, K.K., Likhachev, M.E., Levchenko, A.E., Aleshkina, S.S., Semjonov, S.L., Denisov, A.N., Bubnov, M.M., Lipatov, D.S., Laptev, A.Yu., Gur'yanov, A.N., Andrianov, A.V., Muravyev, S.V., Kim, A.V.
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Koptev et al. (2015) studied this question.
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