Numerical Analysis of Yb 3+ Doped Double Clad Fiber Laser

By solving the rate equations，the expression for output laser power of Yb 3+ doped double clad fiber laser was obtained.The effects of pumping wavelength，pumping power，fiber length，doping concentration，output mirror reflectivity on the laser output power were analyzed by using Matlab software.The results show that the optimum fiber length was different under 915nm and 975nm pumping，and was affected by the doping concentration.The output cavity mirror reflectivity should be as small as possible.The optimized output power of Yb 3+ doped double clad fiber laser could be achieved through optimizing some system parameters of the laser.