2.9 µm lasing from a Ho3+/Pr3+ co-doped AlF3-based glass fiber pumped by a 1150 nm laser

H o 3 + / P r 3 + co-doped A l F 3 -based glass fibers were fabricated by using a rod-in-tube method based on the matrix glass composition of A l F 3 − B a F 2 − C a F 2 − Y F 3 − S r F 2 − M g F 2 − L i F − Z r F 4 − P b F 2 . Under the pump of a 1150 mW Raman fiber laser, a 2.9 µm laser was observed in a 19 cm long H o 3 + / P r 3 + co-doped A l F 3 -based glass fiber with an output power of 173 mW and a slope efficiency of 10.4%. H o 3 + / P r 3 + co-doped A l F 3 -based glasses were fabricated to investigate the deactivation effects of P r 3 + ions on the H o 3 + : 5 I 7 level. Our results showed that the H o 3 + / P r 3 + co-doped A l F 3 -based glass fibers are potential gain media for ∼ 2.9 µ m lasers.