Estimation of the fs laser spot temperature inside TeO2–ZnO–Nb2O5 glass by using up-conversion green fluorescence of Er3+ ions
Estimation of the fs laser spot temperature inside TeO2–ZnO–Nb2O5 glass by using up-conversion green fluorescence of Er3+ ions
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DOI：
10.1016/j.jallcom.2007.04.181
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发表时间：
2008-02
影响因子：
6.2
通讯作者：
T. Hayakawa;M. Hayakawa;M. Nogami
中科院分区：
文献类型：
--
作者：
T. Hayakawa;M. Hayakawa;M. Nogami
利用Er 3+离子的绿色上转换荧光，对碲酸盐（TeO 2）基玻璃在800 nm飞秒脉冲下的激光加热过程进行了光学原位监测，在2 H11/2和4S 3/2能级上，改变了526 nm（2 H11/2- 4 I15/2）和548 nm（4 S3/2- 4 I15/2）两个绿色上转换荧光的强度比。通过与掺Er ~（3+）的铝硅酸盐玻璃的实验结果比较，发现飞秒激光加热是由基质材料TeO_2通过三阶非线性极化率的虚部（χ（3））的非线性吸收引起的。
Laser heating of tellurite (TeO2)-based glass up to ∼550K by femtosecond (fs) pulses of 800nm from a regenerative Ti:sapphire laser was optically in situ monitored using green up-conversion fluorescence of Er3+ions doped in TeO2-based glasses, where a fluorescence intensity ratio of two green up-conversion fluorescence at 526nm (2H11/2–4I15/2) and 548nm (4S3/2–4I15/2) was varied by thermal activation between2H11/2and4S3/2levels. By comparison with results on an aluminosilicate glass doped with Er3+, it was clearly found that the fs laser heating was caused by nonlinear absorption of the host material of TeO2-based glass via the imaginary part of the third-order nonlinear susceptibility (χ(3)).