Numerical analysis for multi-position-pumped double-clad fiber lasers

In order to theoretically study high-power multi-position-pumped double-clad fiber lasers intensively,the numerical analysis methods for this kind of fiber lasers were studied,based on the rate equations and boundary conditions of Yb-doped double-clad fiber lasers.By coordinate scale transform and continuum boundary transform of pumping powers and laser powers,the multi-position-pumped double-clad fiber lasers were transformed into two-boundary value problems and could be numerically analyzed effectively.And the power distributions of pumping lights and lasers along the double-clad fiber laser could be obtained.With numerical analysis,output powers,lost pumping powers and lost laser powers of the multi-position-pumped double-clad fiber lasers could be obtained also,which is very helpful for the optimal analysis and design of this kind of fiber lasers.The research shows that the numerical analysis methods are valuable for advanced study of multi-position-pumped double-clad fiber lasers.