GeO_2含量对掺铒锗碲酸盐玻璃物性和光谱特性的影响

Effects of GeO_2 on the thermal stability and optical properties of Er^(3+)-doped germanate-tellurite glasses

本文研究了xGeO2-(70-x)TeO2-5K2O-5Na2O-10Nb2O5-10ZnO-0·2Er2O3(x=0,10,25,50,70(摩尔百分数))玻璃的物性和光谱特性,讨论GeO2含量对锗碲酸盐玻璃物性和光谱特性的影响.研究发现:GeO2的加入提高了碲酸盐玻璃热稳定性,并且使玻璃的最大声子能量略微增加;随GeO2的增加,掺Er3+锗碲酸盐玻璃的Judd-Ofelt强度参量Ω2和Ω6逐渐增大,但玻璃受激发射截面有减小的趋势;由McCumber理论,计算了掺铒锗碲酸盐玻璃在1·53μm处最大受激发射截面为9·92×10-21cm2,Er3+离子4I13/2→4I15/2发射谱的最大荧光半高宽为52nm,同时,实验发现,在977nmLD抽运下,掺铒锗碲酸盐玻璃存在较强的荧光上转换现象,随GeO2含量的增加,上转换荧光强度呈降低的趋势.

Germanate-tellurite glasses with the molar compositions of x GeO2-（70 - x ） TeO2-5K20-5Na2O-10Nb2O5-10ZnO-0.2Er2O3 （ x = 0,10, 25, 50, 70） have been investigated for developing 1.5μm fiber and planar amplifiers. Effects of GeO2 on the thermal stability and optical properties of Er^3＋ -doped germanate-tellurite glasses have been discussed. It is noted that the thermal stability of the glasses are improved and the maximum phonon energy are increased by increasing GeO2. Adding GeO2 increases the Judd-Ofeh parameters Ω2, Ω6 but decreases the stimulated emission cross sections σe. According to the McCumber theory, the maximum peak of σe is 9.92 × 10^-21cm^2 at 1.53μm in germanate-tellurite glasses. The maximum FWHM of Er^3＋4 I13/2→4I15/2 emission spectrum is 52 nm. In addition, the intensity of upconversion luminescence of the Er^3＋ -doped germanate-tellurite glasses decreases rapidly with increasing GeO2 content.