Passively mode-locked fiber laser based on two-dimensional material MnPSxSey saturable absorber is studyed. By changing the doping ratio of S and Se, three magnetic materials, MnPS2.9Se0.1, MnPS2.8Se0.2 and MnPS2.7Se0.3, are obtained. The three materials were fabricated into sandwich absorbers, and stable mode-locked pulse was obtained in ytterbium-doped fiber lasers. The total length of the fiber laser is 88 m, and the corresponding repetition rate is 2.27 MHz. The signal-to-noise ratio of the three materials is all above 60 dB, indicating the stability of the mode-locking pulse. The experimental results show that MnPSxSey has good nonlinear optical modulation characteristics and optical switching ability, which has potential application value.
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