Theoretical analysis of characteristics for silica based Tm 3+ doped fiber laser

In this paper, a theoretical model of Tm 3+ doped silica fiber laser(TDSFL) for 3 H 6 — 3 H 4 pumping mechanism is established based on the rate-equation theory, and the numerical simulation is performed by using the Runge-Kutta algorithm. The introcavity power distributions of the TDSFL are obtained for both pump and laser, and the effects of Tm 3+ doped fiber length and Tm 3+ concentration on laser performance are analyzed.