Photochemical reaction of divalent-germanium center in germanosilicate glasses under intense near-ultraviolet laser excitation: Origin of 5.7 eV band and site selective excitation of divalent-germanium center
Photochemical reaction of divalent-germanium center in germanosilicate glasses under intense near-ultraviolet laser excitation: Origin of 5.7 eV band and site selective excitation of divalent-germanium center
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DOI：
10.1063/1.1505979
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发表时间：
2002-09
影响因子：
3.2
通讯作者：
Masahide Takahashi;K. Ichii;Y. Tokuda;T. Uchino;T. Yoko;J. Nishii;T. Fujiwara
中科院分区：
文献类型：
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作者：
Masahide Takahashi;K. Ichii;Y. Tokuda;T. Uchino;T. Yoko;J. Nishii;T. Fujiwara
采用近紫外XeF准分子激光器（3.7 eV）作为主要激发源，研究了Ge2+在10GeO2-90SiO2光纤预制棒中的光化学反应和强紫外激光激发下产生5.7 eV光吸收带的来源。综合前人和本文的实验结果，得出了5.7 eV的光吸收带并非来自于Ge(2)电子捕获中心。在此基础上，我们提出了另一种5.7 eV波段起源的结构模型，考虑到相应的中心是抗磁性的实验事实。此外，还发现使用不同光子能量的激光源可以实现Ge2+中心的选择性激发。
The photochemical reaction of Ge2+ in 10GeO2-90SiO2 optical fiber preform and the origin of the 5.7 eV optical absorption band induced by intense ultraviolet laser excitation have been investigated using a near-ultraviolet XeF excimer laser (3.7 eV) as the main excitation source. Based on the previous and present experimental results, it is concluded that the 5.7 eV optical absorption band does not originate from the Ge(2) electron trapped center. In place of this model, we have proposed an alternative structural model for the origin of the 5.7 eV band taking into account the experimental fact that the corresponding center is diamagnetic. In addition, it is found that the site selective excitation of the Ge2+ center can be achieved by using laser sources with different photon energies.