Cascade Co-pumping – From a Comparison View

In this paper, cascade co-pumping Erbium/Ytterbium codoped fiber lasers (EYDFLs) are studied from a comparison view. A 976 nm pumped EYDFL with a 1018 nm auxiliary cavity are compared with EYDFLs cladding-pumped at 915 nm, 940 nm, and core-pumped at 1018 nm, respectively, in aspects as optimal fiber length, pump conversion efficiency, thermal effects, and Yb ASE suppression. The results show that cascade co-pumping is the most effective method among these cases in efficiency, stability, compactness, and cost-effectiveness.