Abstract
Although Ho3+ doped glasses and fibers lasing at 2.1 μm have been extensive studied, an effective means of power scaling still attracts interest from academic and industry societies. Here, by combining the unique characteristics of Bi2O3-B2O3-SiO2 bismuthate glasses and oxidizing effect of CeO2 doping, Ce3+/Yb3+/Ho3+ triply doped glasses of improved optical properties can be obtained. A dramatically enhanced (by more than 50%) 2.1 μm emission of Ho3+ is observed. The underlying mechanism and the possible energy transfer processes between Ce3+, Yb3+ and Ho3+ are discussed. The enhanced emission, together with a full width at half maximum of 190 nm, a stimulated emission cross-section of 4.1 × 10−21 cm2 and an extremely large internal quantum efficiency (more than 90%) of the 2.1 μm emission of Ho3+, suggests good potential of the studied glasses for fiber amplifiers.
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