Blue Up-Conversion Fibre Laser Pumped by a 1120-nm Raman Fibre Laser

A Tm³⁺-doped ZrF₄-BaF₂-LaF₃-AlF₃-NaF (ZBLAN) fibre up-conversion laser pumped by a 1120-nm Raman fibre laser is demonstrated with blue output power levels up to 116mW. For the output mirror with 80% reflectivity, the slope efficiency is about 15%, the optical-to-optical conversion efficiency is 11%, and the maximum un-saturated output power is 116mW. For 60% reflectivity, the slope efficiency is about 18% and the optical-to-optical conversion efficiency is 12%, whilst the maximum saturated output power is about 80mW due to the existence of photo-degradation effect in Tm³⁺ doped ZBLAN glass fibre.