Theoretical analysis of doping management and its effects on power scaling

Abstract

Thermal load and nonlinear effects are two contrary phenomena that make up important drawbacks in rapid progress of high-power fiber lasers. To minimize the thermal load, which limits the average power, doping concentration should be decreased, which brings about increasing length of the fiber. In contrast, the presence of nonlinear effects and their management demand the use of high-doped, shorter fibers in order to maximize the peak power. Management on doping of gain fiber and obtaining a specific doping profile function along the short gain fiber is a proposed solution for prevention of the exchange between thermal load and nonlinear effects. The study shows two different approaches for keeping the temperature levels down in addition to obtaining power scaling profiles.