Enhancement in laser performance of Er³⁺/Yb³⁺ Co-doped phosphate glass materials

Abstract

Er³⁺/Yb³⁺co-doped phosphate are presented, laser glass materials with composition of P₂O₅-A1₂O₃-BaCO₃-KNO₃-Li₂O-ZnO-Er₂O₃-Yb₂O₃ (R-PABKLZ) are presented, in which an optimal molar ratio of 1:4 between Er³⁺ and Yb³⁺ was observed for achieving peak laser gain. Furthermore, due to adding 4.7 mol% Li¹⁺ and 4.6 mol% Zn²⁺ ions into the glass, an optimum composition structure based laser material was demonstrated. On the other hand, since the high temperature melting method with changeable temperature control was used, the emission cross section of fluorescence, excited lifetime, and an effective spectral half width reached 9.70 × 10⁻²¹ cm², 8.20 ms, and 53.16 nm, respectively, so that a laser gain (σ_emi×τ_rad) of 103.05 was obtained, which is significantly higher than previously reported results. The manuscript also argued the mechanism of relevant laser gain improvement.

Keywords

Er³⁺/Yb³⁺ co-doped / temperature shift / gain

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