Abstract:We investigated the ~2 µm spectroscopic and lasing performance of Tm 3+ and Tm 3+-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 ~2.5 dB/m at 1310 nm. The spectroscopic properties of the fibers were analyzed. A 494 mW laser operating at ~1.9 µm was achieved in a Tm 3+ doped 20 cm long fiber, the slope efficiency was 26%, and the laser beam quality factor M 2 was 1.09. A 35 mW ~2.1 µm laser output was also demonstrated in a 7 cm long of Tm 3+ -Ho 3+ co-doped tungsten tellurite SM fiber.

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