Theoretical analysis of Yb3+-doped double-clad fiber lasers using a new analytical method

The approximate analytical solutions to the threshold pump power and output laser power of Yb3+-doped double-clad fiber lasers have been deduced based on the rate equations with the scattering losses of pump and laser signal. In the rate equations, the relation between the attenuation of the pump light and the population density on the upper level is considered. The characteristics of Yb3+-doped double-clad fiber lasers have been investigated.