2.9 µm lasing from a Ho/Pr co-doped AlF-based glass fiber pumped by a 1150 nm laser.

/ co-doped -based glass fibers were fabricated by using a rod-in-tube method based on the matrix glass composition of --------. Under the pump of a 1150 mW Raman fiber laser, a 2.9 µm laser was observed in a 19 cm long / co-doped -based glass fiber with an output power of 173 mW and a slope efficiency of 10.4%. / co-doped -based glasses were fabricated to investigate the deactivation effects of ions on the : level. Our results showed that the / co-doped -based glass fibers are potential gain media for ∼2.9µ lasers.