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Improvement of soliton pulse energy in thulium-doped fiber laser

In this paper, we report a thulium-doped fiber based on nonlinear polarization rotation technology. Increasing the pump power to 600mW and adjusting the polarization controllers, Gaussian pulse with high pulse energy can be achieved. The pulse duration of de-chirped pulse is 553 fs. Due to dispersion management, excessive nonlinear phase shift accumulation can be avoided. The maximum output power of the resonant cavity is 86.3mW, and the corresponding pulse energy is 2.96nJ.