Tm<sup>3+</sup>/Yb<sup>3+</sup>共掺碲酸盐玻璃的近红外发光及能量传递机理

徐星辰; 周亚训; 王森; 魏淑林; 戴世勋; 王训四

doi:doi:10.3788/gzxb20124109.1028

光子学报, 2012, 41 (9): 1028, 网络出版: 2012-08-31

Tm³⁺/Yb³⁺共掺碲酸盐玻璃的近红外发光及能量传递机理

Nearinfrared Emission and Energy Transfer Mechanism of Tm3+/Yb3+ Codoped Tellurite Glasses

论文大纲

徐星辰 ^*周亚训王森魏淑林戴世勋王训四

作者单位

宁波大学信息科学与工程学院, 浙江宁波 315211

碲酸盐玻璃 Tm3+/Yb3+共掺能量传递上转换 Tellurite glasses Tm3+/Yb3+ codoping Energy transfer Upconversion emission

摘要

采用高温熔融法制备了组分为TeO2ZnONa2O的Tm3+离子单掺和Tm3+/Yb3+共掺碲酸盐玻璃, 应用JuddOfelt理论计算分析了玻璃样品的强度参量Ωt(t=2, 4, 6), 自发辐射跃迁几率A, 荧光分支比β和荧光辐射寿命τrad等光谱参量, 测量得到了不同Yb3+离子掺杂浓度下玻璃样品的Tm3+离子上转换发光谱.结果显示, 在980 nm泵浦光激励下玻璃样品发射出强烈的近红外上转换荧光.对Tm3+离子上转换发光分析表明, 强烈的Tm3+离子近红外上转换发光主要来自于Yb3+/Yb3+离子间的共振能量传递以及基于单声子和双声子辅助的Yb3+/Tm3+离子间的非共振能量传递过程, 并进一步计算得到了声子贡献比和能量传递系数.最后, 计算分析了Tm3+∶3F4→3H6能级间跃迁的1.8 μm波段吸收截面、受激发射截面和增益系数.研究表明, Yb3+/Tm3+共掺TeO2ZnONa2O玻璃可以作为近红外波段固体激光器的潜在增益基质.

Abstract

Tm3+ single doped and Tm3+/Yb3+ codoped tellurite glasses with the composition of TeO2ZnONa2O were prepared by meltquenching method. The intensity parameters Ωt(t=2, 4, 6), spontaneous radiative transition rates A, fluorescence branching ratios β and radiative lifetimes τrad of Tm3+ were calculated based on the JuddOfelt theory, and the upconversion luminescence of Tm3+ for glass sample with different Yb3+ doping concentration was measured. The results show that the glass sample can emit strong nearinfrared upconversion emission under the excitation of 980nm pump light. The analysis of Tm3+ upconversion emission process reveals that the intense nearinfrared upconversion luminescence of Tm3+ ions is mainly ascribed to the result of energy transfers: first the resonant energy transfer from Yb3+ to Yb3+ ions, and then followed by one and two phononassisted nonresonant energy transfer from Yb3+ to Tm3+ ions. The energy transfer coefficient and phonon contribution for the above energy transfer process were calculated. Furthermore, the 1.8μm band absorption, emission crosssections and gain coefficient of Tm3+∶3F4→3H6 transitions were calculated and analyzed. The research indicates that Yb3+/Tm3+ codoped TeO2ZnONa2O glass is a promising host material applied for nearinfrared band solid laser.

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徐星辰, 周亚训, 王森, 魏淑林, 戴世勋, 王训四. Tm³⁺/Yb³⁺共掺碲酸盐玻璃的近红外发光及能量传递机理[J]. 光子学报, 2012, 41(9): 1028. XU Xingchen, ZHOU Yaxun, WANG Sen, WEI Shulin, DAI Shixun, WANG Xunsi. Nearinfrared Emission and Energy Transfer Mechanism of Tm3+/Yb3+ Codoped Tellurite Glasses[J]. ACTA PHOTONICA SINICA, 2012, 41(9): 1028.

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