Influence of cerium ions on thermal bleaching of photo-darkened ytterbium-doped fibers

摘要

We studied the influence of cerium (Ce) ions on photo-darkening (PD) behavior in ytterbium/aluminum (Yb/Al) co-doped silica fibers at room and elevated temperatures.Low levels of PD was observed for Ce codoped Yb/Al fiber.And the Yb/Al co-doped fiber was completely bleached at ～600℃.The addition of Ce ions as co-dopant can significantly lower the initial recovery and complete bleaching temperatures.The complete recovery temperature is ～ 450℃ and ～400℃ for Yb/Al/Ce low fiber and Yb/Al/Ce high fiber respectively.More importantly,Ce co-doping in Yb/Al fiber also decreases the heatinduced loss.