掺铒TeO2-B2O3-Nb2O5-ZnO玻璃系统的光谱性质和热稳定性的研究

制备了碲酸盐玻璃样品70TeO2-(15-x)B2O3-xNb2O5-15ZnO-1wt%Er2O3(TBN,x=0,3,6,9,12,15 mol%).测试了玻璃样品的热稳定性和光谱性质.根据Judd-Ofelt理论计算了TBN玻璃中Er3 离子的强度参数(Ω2=(5.42～6.76)×10-20 cm2,Ω4=(1.37～1.73)×10-20cm2,Ω6=(0.70～0.94)×10-20 cm2),发现随着Nb2O5含量的增加,Ωt(t=2,4,6)先增加后减小.研究表明Er-O键共价性主要受基质玻璃中非桥氧数的影响,而阴阳离子间电负性的影响可以忽略.应用McCumber理论计算了Er3 离子的受激发射截面(σe=(0.77～0.91)×10-20 cm2)和Er3 离子4I13/2→4I15/2发射谱的半高宽度(FWHM=65～73 nm).比较了不同基质玻璃中Er3 离子的荧光半高宽和受激发射截面.结果表明TBN玻璃系统具有较好的带宽性能,是一种制备宽带光纤放大器的潜在基质材料.

Investigation on spectral properties and thermal stability of Er3+ doped TeO2-B2O3-Nb2O5-ZnO glasses

A series of new 70TeO2－(15－x)B2O3－xNb2O5－15ZnO－1 wt%Er2O3(TBN x=0,3,6,9,12,15 mol%)tellurite glasses were prepared. The thermal stability and spectral properties,such as absorption spectra and emission spectra of the glass samples were measured and investigated. Three intensity parameters Ωt(t= 2,4,6)(Ω2=(5.42～6.76)×10－20cm2,Ω4=(1.37～1.73)×10－20cm2,Ω6=(0.70～0.94)×10－20cm2)of Er3+ were calculated by Judd-Ofelt theory. It was found that the intensity parameters Ωt(t=2,4,6)increase with the increasing of Nb2O5 content from 0 mol% to 6 mol% and then decrease. It indicates that the covalence between the Er3+ and O2－ is mainly affected by the number of non-bridging oxygen ions. However,the effect of the electro negativity between negative ions and positive ions on the covalence between the Er3+ and O2－ can be neglected. The stimulated emission cross-section(σe=(0.77～0.91)×10－20cm2)of the Er3+ ions 4I13/2→4I15/2 transition were calculated according to the McCumber theory and the full width at half maximum(FWHM=65～73 nm)of the 4I13/2→4I15/2 emission were measured. The FWHM and emission cross-section of Er3+ ions in different glass hosts were compared. The results show that this tellurite glass has wider bandwidth and could be the promising host material for broadband amplification.