【摘要】 采用提拉法生长了双掺Yb3+和Er3+离子浓度分别为18.63%和0.87%(原子分数)的Sr3Y2(BO3)4晶体。利用测量的偏振吸收谱结合Judd-Ofelt理论,拟合得到了该晶体中Er3+离子的偏振和有效J-O参数。测量了Er3+离子4I13/2能级和Yb3+离子2F5/2能级的荧光衰减曲线,并计算了4I13/2能级的荧光量子效率和Yb3+到Er3+的能量传递效率。利用Fuchtbauer-Ladenberg公式计算了Er3+离子4I13/2→4I15/2跃迁的偏振受激发射截面。在平-凹谐振腔中,利用970 nm波长光纤耦合准连续半导体激光端面泵浦1.12 mm厚的该晶体,当输出镜透过率为1.5%时,获得了最大输出功率为1.3 W和斜率效率为20%的1560 nm附近的激光输出。结果表明,Er3+/Yb3+:Sr3Y2(BO3)4晶体是一种优良的1.5～1.6μm波段激光的增益介质。更多还原

【Abstract】 An Er³⁺/Yb³⁺:Sr₃Y₂（BO₃）₄ crystal with Yb3+ and Er³⁺ concentrations of 18.63% and 0.87% was grown by the Czochralski method.The Judd-Ofelt theory was used to analyze polarized Absorption spectra and then to calculate the polarized and effective J-O parameters.The fluorescence decay curves of 4I13/2 and 2F5/2 multiplet for Er³⁺ and Yb3+ ions,respectively,were measured.The fluorescence quantum efficiency of 4I13/2 multiplet and energy transfer efficiency for Yb3+ to Er³⁺ were estimated.Polarized stimulated cross-sections of 4I13/2→4I15/2 transition for Er³⁺ ions were obtained by the Fuchtbauer-Ladenberg formula.The end-pumped by a fiber-coupling quasi-cw diode laser at 970 nm,laser around 1560 nm with output power and slope efficiency up to 1.3 W and 20%,respectively,was obtained from a 1.12 mm-thick Er³⁺/Yb³⁺:Sr₃Y₂（BO₃）₄ crystal in a hemispherical cavity with the output coupler transmission of 1.5%.The results showed that this crystal was a good gain medium for 1.5¹.6 μm laser.更多还原