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Control of the anisotropy in the formatin of silver precipitates in Ag-Cl containing glass

含 Ag-Cl 玻璃中银沉淀形成各向异性的控制

基本信息

批准号：
07805033
负责人：
NISHIKAWA Hiroyuki
金额：
$ 1.41万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07805033/
关键词：
precipitates anisotropy optical fibers silica glass electron spin resunance photo luminessence excimer laser undulator 偏光ガラス光化学アンジュレータ光

项目摘要

During the course of the present research on the optically-induced anisotropy in the precipitates of glass, germanium-doped silica glass for optical fibers was found to be highly photosensitive against UV laser irradiation. Especially, the photosensitivity was significantily enhanced by a high-pressure hydrogen treatment. Thus, emphasis has been placed on the photosensitivity of germanuium-doped silica by means of the measurements of optical absorption in UV regions, photoluminescence (PL) , and electron spin resonance (ESR) .Polarized light with an energy of 36 eV from an undulator installed at BL 3A1 line of UVSOR was illuminated onto the germanium-doped silica glass. Photoluminescence and ESR measurements were carried out on the sample. In order to monitor photochemical reactions induced by light illumination, PL bands at 3.1 and 4.2 eV were measured. The decay of the PL follows a stretched exponential function, suggesting that the reaction occurs at the site of oxygen-deficient states in the germanium doped silica. The ESR of the germanium E'centers observed after the light illumination exhibit no angular dependence against the applied magnetic field.It is found that the formation of paramagnetic centers involves nonradiative relaxation of electron-hole pairs created by two-photon absorption of a KrF excimer laser. Refractive index changes induced by KrF laser illumination were investigated by the measurements of a Bragg reflection from a grating formed by illumination through a phase mask. The refractive index change was correlated with the formation of UV absorption bands. It is also found that high-dose gamma irradiation can produce clusters of Si in silica glass, which exhibit photoluminescene in the visible regions.

在目前对玻璃沉淀物中光致各向异性的研究过程中，发现用于光纤的掺锗石英玻璃对紫外激光照射具有高度光敏性。特别是，通过高压氢处理显着增强了光敏性。因此，通过测量紫外区的光吸收、光致发光（PL）和电子自旋共振（ESR），重点研究了掺锗二氧化硅的光敏性。来自UVSOR BL 3A1线安装的波荡器的能量为36 eV的偏振光照射到掺锗二氧化硅玻璃上。对样品进行光致发光和 ESR 测量。为了监测光照射引起的光化学反应，测量了 3.1 和 4.2 eV 的 PL 谱带。 PL 的衰减遵循拉伸指数函数，这表明反应发生在掺锗二氧化硅中的缺氧态位置。光照射后观察到的锗E'中心的ESR对所施加的磁场没有表现出角度依赖性。我们发现顺磁中心的形成涉及由KrF准分子激光器的双光子吸收产生的电子-空穴对的非辐射弛豫。通过测量通过相位掩模照射形成的光栅的布拉格反射，研究了 KrF 激光照射引起的折射率变化。折射率的变化与紫外吸收带的形成相关。研究还发现，高剂量伽马射线照射可以在石英玻璃中产生硅簇，在可见光区域表现出光致发光。