Passively mode-locked ytterbium-doped fiber laser based on MnPSxSey saturable absorber

Passively mode-locked fiber laser based on two-dimensional material MnPS_xSe_y saturable absorber is studyed. By changing the doping ratio of S and Se, three magnetic materials, MnPS_2.9Se_0.1, MnPS_2.8Se_0.2 and MnPS_2.7Se_0.3, 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 MnPS_xSe_y has good nonlinear optical modulation characteristics and optical switching ability, which has potential application value.