为了研究锗酸盐玻璃中采用Yb³⁺/Tm³⁺/Ho³⁺三掺杂方式实现2 μm激光的可行性,研究了3种稀土离子的掺杂浓度对近2 μm发光的影响,从而对稀土离子掺杂浓度进行优化选择以确定理想的掺杂浓度。实验结果表明,在TmF3掺杂摩尔分数为1%时,随着Yb³⁺浓度的提高Ho³⁺的2 μm荧光强度增强[当TmF3掺杂摩尔分数为3%时,随着Yb³⁺浓度的提高Ho³⁺的2 μm荧光强度降低[随着Yb³⁺浓度的提高,Tm³⁺的近2 μm荧光发射会得到增强,且当Tm³⁺浓度较高时其发光更为明显,这相对削弱了Ho³⁺的2 μm荧光。Ho³⁺2 μm发光受Tm3＋/Ho³⁺的浓度比值影响很大,即用980 nm光抽运三掺杂样品,无论Tm³⁺浓度单一提高还是Ho³⁺浓度单一降低,对于Ho³⁺的2 μm荧光都是不利的。

In order to study on the feasibility of achieving 2 μm laser by using Yb³⁺/Tm³⁺/Ho³⁺ codoping in germanium glass,the effects of doping concentration of three rare-earth ion on the nearly 2 μm luminscence were researched,so optimized doping concentration can be acquired.The results show that when the doping mole fraction of TmF3 is 1%,the 2 μm luminscence of Ho³⁺ increases with doping concentration of Yb3 + ions.However,as the doping mole fraction of TmF3 is increased to 3%,the 2 μm luminscence intensity of Ho³⁺ is reduced with increasing doping concentration of Yb3 +.The near 2 μm luminscence of Tm³⁺ can be raised by increasing doping concentration of Yb³⁺ ions and it is more apparent at high doping concentration of Tm³⁺ ions,which could weaken the luminscence of Ho³⁺ relatively.On the whole,the 2 μm luminscence of Ho³⁺ is significantly effected by the doping concentration ratio of Tm3＋/Ho³⁺.When the three doped samples were pumped by 980 nm LD,both the high doping concentration of Tm³⁺ ions and low doping concentration of Ho³⁺ ions can lead to the reduction of 2 μm luminscence intensity of Ho³⁺.