Er3+掺杂硫系玻璃微球在980nm激光泵浦下的荧光特性

采用玻璃粉料高温漂浮熔融法制备了0.9%Er₂S₃（质量分数）：75%GeS₂-15%Ga₂S₃-10%CsI（摩尔分数）硫系玻璃微球，并用熔融拉锥法制备了锥腰直径为2.31 μm的石英光纤锥。将其与直径119 μm的硫系微球进行耦合，在980 nm 激光泵浦下获得了微球中与Er³⁺：⁴I_13/2→⁴I_15/2跃迁对应的1.54 μm处的荧光光谱。分析了微球和块状玻璃荧光光谱差异的原因，并用Mie散射理论公式对微球荧光光谱共振峰间隔进行了计算。共振峰间隔实验结果与理论计算误差最小仅为0.05%，验证了理论分析的正确性。最后，讨论了微球峰值间隔与泵浦功率的关系，排除了泵浦功率对共振峰间隔的影响。

Fluorescent Characteristics of Er3+ Doped Chalcogenide Glass Microsphere Under 980 nm LD Pumping

Chalcogenide glass microspheres were fabricated by high temperature melting floating glass powder method. The glass composition was 0.9%Er₂S₃(mass fraction):75%GeS₂-15%Ga₂S₃-10%CsI(mole fraction). A quartz fiber taper with a 2.31 μm waist diameter was drew at fuse and used to couple a 119 μm diameter chalcogenide microsphere with a 980 nm LD pumping source. Fluorescence spectra with apparent resonance peaks were observed near 1.54 μm(Er³⁺:⁴I_13/2→⁴I_15/2). The difference of microsphere and bulk glass fluorescent spectrum was analyzed and the locations and separations of those resonance peaks were calculated using the Mie scatter theory. It is found that the theoretical results match the experimental results well, and the minimum error is only 0.05%. At last, we discussed the relationship of pump power and microsphere fluorescent peak gap, and removed the influence of pump power having on fluorescent peak gap.