Theoretical study of Pr^(3+):ZBLAN upconversion ultraviolet fiber laser based on

A theoretical study of the kinetics of two-step-excitation upconversion ultraviolet cw fiber laser based on the 4f5d state in Pr^(3+):ZBLAN is performed using steady population rate equations and light propagation equations. Under different Pr^(3+) concentrations, the dependence of the threshold pum