Numerical optimization of tunable Dy-doped ZBLAN fiber lasers for yellow emission

The interest in fiber lasers operating in the yellow range of the visible spectrum has greatly increased alongside the improvement of blue pump laser diodes, as well as the recent fabrication of high-quality Dysprosium-doped fluoride fibers, to be used as the active medium. In this work, a matrix-based simulation model which exploits the rate equations was applied to examine the influence of excited state absorption on the performances of a tunable yellow source. Simulation results provide useful guidelines to improve the tunability range of the yellow fiber laser, by properly selecting the reflectivity of the output mirror and the active fiber length.