Phosphorus Influence on the Photodarkening Effect of Yb-APS Fiber

We fabricated an ytterbium-doped phosphorus-low aluminophosphosilicate ternary laser fiber. Owing to photodark-ening and mode instability, the fiber-based kW-level laser setup showed obvious degradation of laser power and slope efficiency as compared to that with cladding-power-stripper-free.