Tm^(3+)/Ho^(3+)共掺镓铋酸盐玻璃1.47μm发光特性和能量传递的研究

Spectroscopic properties and energy transfer of Tm^(3+)/Ho^(3+)-codoped Ga_2O_3-Bi_2O_3-GeO_2-PbO-PbF_2 glasses for 1.47μm luminecence

报道了Tm3+/Ho3+共掺的镓铋酸盐玻璃14Ga2O3-25Bi2O3-20GeO2-31PbO-10PbF2玻璃1.47μm(S波段)发光和能量传递特征,应用Judd-Ofelt理论计算了玻璃的强度参数Ωt(t=2,4,6),自发辐射概率A、荧光分支比β,荧光辐射寿命τ等各项光谱参数以及有效荧光线宽Δλeff和峰值发射截面σepeak.通过测量荧光光谱和荧光寿命研究了Ho3+离子掺杂浓度对Tm3+离子1.47μm波段发光性能的影响,分析了Tm3+和Ho3+之间的能量传递过程.结果表明一定浓度内Ho3+的共掺迅速降低了Tm3+:3F4能级的粒子数,而对3H4能级粒子数影响不大,从而降低了3F4和3H4能级间布居数反转的难度,极大地提高了1.47μm发光效率.研究表明镓铋酸盐玻璃是适用于S波段光纤放大器的一种潜在基质材料,而掺杂一定浓度的Ho3+离子有利于提高Tm3+离子在1.47μm波段的发光效率.

This paper reports on the spectroscopic properties and energy transfer of Tm^3＋/Ho^3＋ -codoped 14Ga2O3-25Bi2O3-20GeO2- 31PbO-10PbF2 glasses. The Judd-Ofeh intensity parameters Ωt （ t = 2,4,6）, spontaneous-emission probability, branch ratio and radiative lifetime of each level of Tm^3 ＋ have been calculated by Judd-Ofeh theory. The effective bandwidth and peak emission cross-section of the ^3H4→^3F4 transition （ 1.47 μm） of Tm^3 ＋ have also been obtained. Codoping of Ho^3 ＋ significantly decreased the population of ^3F4 level of Tm^3 ＋ , while the population of ^3 H4 level of Tm^3 ＋ reduced slightly. Our results indicate that GGBPF glass is a promising candidate for 1.47 μm optical amplifiers, and Ho^3 ＋ is an effective codopant to enhance the 1.47 μm luminescence.