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We report on our recent results for output scaling by a Thulium-doped fiber Mamyshev oscillator in the spectral 2 µm region. In order to further scale the output, a highly Thulium-doped double-clad fiber was implemented in the Mamyshev oscillator. A stable pulse train at a repetition rate of 19.7 MHz with an average power of 220 mW was observed. This corresponds to a pulse energy of 11 nJ at a pulse length of 2.4 ps. Further scaling of the output parameters was limited by soliton fission, which will be mitigated by introducing normal dispersive fiber sections in future experiments.
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