Output characteristics of the mode-locked thulium-doped fiber laser near 2 um based on MoS2

The output characteristics of the mode-locked thulium-doped fiber laser with MoS₂ as saturable absorber are simulated based on rate equation and nonlinear Schrodinger equation. With small signal gain efficient as variable, the effect of pump power, length of gain fiber, doping concentration and other parameters on output characteristics are analyzed. The theoretical results show an optimum doping concentration or fiber length exists to obtain maximum gain and average output power for given doped fiber. In experiment a thulium-doped fiber laser is setup and the experimental output characteristics of the laser are compared with theoretical counterpart, as a result, theoretical results are well in consistence with experimental results.