Tm3+ and Tm3+-Ho3+co-doped tungsten tellurite glass single mode fiber laser

We investigated the similar to 2 mu m spectroscopic and lasing performance of Tm3+ and Tm3+-Ho(3+)co-doped tungsten tellurite glass single mode fibers with a commercial 800 nm laser diode. The double cladding single mode (SM) fibers were fabricated by using rod-in-tube method. The propagation loss of the fiber was similar to 2.5 dB/m at 1310 nm. The spectroscopic properties of the fibers were analyzed. A 494 mW laser operating at similar to 1.9 mu m was achieved in a Tm3+ doped 20 cm long fiber, the slope efficiency was 26%, and the laser beam quality factor M-2 was 1.09. A 35 mW similar to 2.1 mu m laser output was also demonstrated in a 7 cm long of Tm3+-Ho(3+)co-doped tungsten tellurite SM fiber. (C) 2012 Optical Society of America