Er3+/Tm3+共掺碲酸盐玻璃1.8 μm波段光谱特性研究

Investigation on 1.8 μm Spectral Properties of Er3+/Tm3+ Co-doped Tellurite Glasses

摘要:

为分析Er³⁺/Tm³⁺共掺碲酸盐玻璃的发光性能，得到1.8 μm处的高强度发光。采用熔融退火法，制备了Tm₂O₃掺杂浓度（摩尔百分数）为0.25%、0.5%、1%、1.5%和2%的75TeO₂-20ZnO-5La₂O₃-0.5Er₂O₃碲酸盐玻璃。对碲酸盐玻璃进行吸收光谱的测定，同时研究其在1.8 μm波段的光谱特性。吸收光谱测试结果表明：碲酸盐玻璃在800 nm附近的吸收峰为Er³⁺的⁴I_15/2→⁴I_9/2跃迁和Tm³⁺的³H₆→³H₄跃迁的叠加，说明两种稀土离子都得到了很好的溶解混合；发射光谱在1200—2200 nm范围内，在1.53和1.8 μm处出现了发射峰，且1.53 μm处的发光远弱于1.8 μm处的；1.8 μm处的发射峰是Tm³⁺离子在³F₄→³H₆跃迁产生的，由峰值波长分别为1740和1857 nm的分解谱线组成，此时该玻璃发生了荧光俘获效应，随着Tm₂O₃掺杂浓度的增加，1740 nm处分解谱线的相对强度逐渐降低，而1857 nm处分解谱线相对强度逐渐增大。该玻璃同时具有较大的受激吸收截面以及发射截面，有望成为一种新型的2 μm波段的激光玻璃材料。

Abstract:

In order to analyze the luminescence properties of Er³⁺/Tm³⁺ co-doped tellurite glass to obtain high-intensity luminescence at 1.8 μm. 75TeO₂-20ZnO-5La₂O₃-0.5Er₂O₃ tellurite glasses with Tm₂O₃ doping concentrations of 0.25， 0.5， 1， 1.5 and 2 mol% were prepared by melt annealing. The absorption spectrum test shows that the absorption peak near 800 nm produces the superposition of ⁴I_15/2→⁴I_9/2 transition of Er³⁺ and ³H₆→³H₄ transition of Tm³⁺， indicating that the two rare earth ions have been well dissolved and mixed. The emission spectrum has two emission peaks at 1.53 μm and 1.8 μm in the range of 1200—2200 nm， and the fluorescence emission spectrum generated by the ³F₄→³H₆ energy level transition of Tm³⁺ ion is composed of two spectral lines with peak centers of 1740 nm and 1857 nm respectively. At this time， the fluorescence capture effect occurs， resulting in the gradual decrease of the relative intensity of 1740 nm and the gradual increase of the relative intensity of 1857 nm with the increase of Tm₂O₃ doping concentration. The glass has both a large stimulated absorption cross-section and a stimulated emission cross-section， and is expected to become a new laser glass material in 2 μm band.