Tm~(3+) Doped Tellurite Microstructure Fiber Laser

We investigated the ~ 2 μm lasing performance of Tm3 +doped tellurite microstructure fiber pumped by an Er3 +doped silica fiber laser operating at 1 560 nm. The microstructure fibers consisting of a solid core surrounded by six air holes were fabricated by using a rod-in-tube method.A maximum unsaturated power of 9 mW laser operating at ~ 1 872 nm was obtained in a Tm3 +doped 2. 8 cm long microstructure fiber with the slope efficiency of ~ 6. 53% and the threshold power of ~ 200 mW. The results indicate that the Tm3 +doped tellurite microstructure fiber is a promising material for the compact 2 μm fiber laser.