La_2O_3含量对Tm^(3+)掺杂碲酸盐玻璃热稳定性及光学性能的影响  

Effects of La_2O_3 content on thermostability and optical properties of Tm^(3+)-doped tellurite glasses

作　　者：吴钟晴[1] 成茵[1] 周伟伟[1] 吴腾宴[1] 杨海军[1] 

机构地区：[1]长沙理工大学物理与电子科学学院,湖南长沙410004

出　　处：《光电子．激光》2014年第5期897-902,共6页Journal of Optoelectronics·Laser

基　　金：国家自科科学基金(21276028);国家科技部对俄国际合作项目(DFR50970);湖南省科技厅(2012WK3009)资助项目

摘　　要：采用高温熔融法,制备了75TeO2-20ZnO-xLa2O3-0.8Tm2O3(x=0、5、10、15mol%)系列玻璃。探讨了La2O3含量对玻璃热稳定性的影响规律;计算了Tm3+在玻璃中的Judd-Ofelt(J-O)强度参数、自发辐射概率、荧光分支比及荧光辐射寿命;分别在473nm和808nm泵浦源下测量了玻璃的荧光光谱,计算了Tm3+在碲酸盐玻璃中的荧光有效线宽、峰值受激发射截面。研究发现,随着La2O3含量的增加,碲酸盐玻璃ΔT(ΔT=Tx-Tg,即初始析晶温度Tx与玻璃转变温度Tg之差)从123℃增加到180℃,玻璃热稳定性提高;La2O3的添加有利于提高Tm3+在1.46μm处的荧光性能;当La2O3含量为15mol%时,其FWHM和FWHM×σe值最大,分别为113.2nm和409.33×10-28cm3。75TeO_2-20ZnO-xLa_20_3-0.8Tm_20_3（x=0,5%,10%,15% in mole ratio） tellurite glasses were prepared by high temperature melting method. The effects of La2 03 content on thermostability of tellu- rite glasses are analyzed by DSC curves. J-O strength parameters, spontaneous emission probabilities,flu- orescence branching ratios, fluorescence radiative lifetime and other spectrum parameters of Tm3＋ ions in tellurite glasses are calculated with absorption spectra and Judd-Ofelt theory. The fluorescence spectra are measured under the pumping wavelengths of 473 nm and 808 nm, respectively. The effective line- width of fluorescence and emission cross sections are calculated. The results indicate that the increase of La_2 0_3 content is beneficial to improving the thermostability of tellurite glasses （as △T= Tx-Tg chan- ges from 123 ℃ to 180 ℃） and enhancing the fluorescence spectral properties of Tm3＋ at 1.46 μm. When La2Oa mole ratio is 15% ,the values of the full width at half maximum （FWHM） and FWHMX σ_e can reach up to 113.2 nm and 409.33 × 10-28 cm3 ,respectively,and it is a potential host material used for S band optical amplifier.

关 键 词：Tm^3+掺杂碲酸盐玻璃 La2O3含量 热稳定性 荧光光谱 

分 类 号：TQ171[化学工程—玻璃工业]