Stimulated Brillouin scattering in Yb3+-doped dual-clad fiber lasers based on the temperature-dependent model

Temperature-dependent high power Yb3+-doped dual-clad fiber lasers model with stimulated Brillouin scattering (SBS) is proposed. The numerical simulation results show that the temperature distribution, laser power, pump power and Stokes powers propagating along axial positions are obtained after only few iteration times using number sequence transition method based on MATLAB BVP solvers (NSTM-BVPs). Compared the results of the fiber laser model without temperature factor, the SBS threshold powers and corresponding laser output powers at different fiber lengths and core diameters in our fiber laser model are obtained in detail. The effect of temperature factor on the SBS threshold power cannot be negligible for short fiber length less than 15 m. While for long fiber length, the influences of temperature factor on the SBS threshold powers can be disregarded with fiber core diameter from 20 μm to 40 μm. In addition, the temperature factor has practically no effect on the corresponding laser output power to SBS threshold power.