近紫外光在光纤中制备布拉格光栅

D. Starodubov, V. Grubsky, J. Feinberg
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引用次数: 1

摘要

锗硅酸盐纤维的光敏性与锗缺氧缺陷(GODC)的存在有关[1,2]。这些缺陷通过240 nm处的强吸收峰和330 nm处的弱吸收峰来识别(图1)[3]。这些缺陷的微观模型仍然存在争议[4-7];然而,图2所示的缺陷的三级模型很好地解释了缺陷的主要光谱特征[4]。人们认为240 nm光使缺陷光离形成色心是指数变化的主要机制(通过Kramers-Kronig关系)[8]。然而,最近的张力测量和紫外线照射后玻璃致密化的观察表明,玻璃发生了结构转变[9,10]。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bragg Grating Fabrication in Fibers by Near-UV Light
The photosensitivity of germanosilicate fibers has been tied to the presence of germanium oxygen-deficient defects (GODC) [1,2]. These defects are identified by a strong absorption peak at 240 nm and a weaker absorption peak at 330 nm (Fig. 1) [3]. The microscopic model of these defects is still debated [4-7]; however, the three-level model of the defect shown in Fig. 2 nicely explains the defect’s main spectroscopic features [4]. It was thought that color center formation due to photoionization of defects by 240 nm light was the principal mechanism of index change (through the Kramers-Kronig relation) [8]. However recent tension measurements and observations of glass densification after UV exposure suggest that a structural transformation of the glass occurs [9,10].
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