研究了(90-x)TeO_2-xWO_3-9La_2O_3-1Tm_2O-3(x=10、20、30(mol%))玻璃(以下简称TwL玻璃)的热学性能和光谱性质.研究发现WO-3的增加可以提高TWL玻璃的热稳定性,降低玻璃的热膨胀系数.WO_3含量为30mol%时,玻璃化转变温度T_g达457℃,DTA曲线上无析晶开始温度T_x,且热膨胀系数降为1.224×10~(-5)/℃(30～300℃).玻璃的最大声子能量随WO_3的增加而略微增大.用J-O理论计算了Tm~(3+)离子在TWL玻璃中的光谱参数和部分能级的自发辐射几率、荧光分支比、辐射寿命.用McCumber理论计算了Tm~(3+)离子~(3)F_4>→~3H_6跃迁的受激发射截面,在60TeO_2-30WO_3-9La_2O_3-1Tm_2O_3玻璃中,Tm~(3+)离子的最大受激发射截面达到9.6×10~(-21)cm~2研究结果表明,60TeO_2-30WO_3-10La_2O_3玻璃具有优良的热学性能和光谱性质,是一种实现～2.0μm激光输出的理想玻璃基质材料.
Tungsten-lanthanum-tellurite (TWL) glasses with the molar composition (90-x)TeO_2-xWO_3-9La_2O_3-1Tm_2O_3(x =10, 20, 30(mol%)) were prepared. Effects of WO_3 contents on the thermal stability and spectroscopic properties of Tm~(3+) doped TWL glasses were studied. It is found that the thermal stability of TWL glasses is improved with the increasing WO_3 contents. For the glass with 30mol% WO_3, the glass tran-sition temperature(T_g) is 457℃, while onset crystallization temperature(T_x) is not observed in DTA curve, and the thermal expansion coefficient of the glass decreases to 1.224×10~(-5)/℃ (30-300℃). The maximum phonon energy of the glasses shows the dependence on the host composition. The spectroscopic intensity pa-rameters (Ω_t t =2,4,6), radiative transition rates, radiative lifetimes, and branching ratios are calculated by Judd-Ofelt theory. The emission cross-section of Tm~(3+): ~3F_4→~3H_6 transition is calculated by McCu-mber theory. The maximum emission cross-section of Tm~(3+) in 60TeO_2-30WO_3-9La_2O_3-1Tm_2O_3 glass is 9.6×10~(-21)cm~2. Evaluated from the thermal and spectroscopic properties, 60TeO_2-30WO_3-10La_2O_3 glass is a promising host material for ～2.0μm laser.
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