基于色心模型掺杂硼锗光纤材料紫外光诱导光敏特性的实验分析

Experimental analysis of photoinduced absorption change in a boron-codoped germanosilicate preform based on the color-center model

本文研究和分析了用于制作光纤光栅锗硼硅材料的紫外光致折射率变化的规律。在不同脉冲和不同能流密度条件下 ,对载氢和未载氢两类锗硼硅光纤材料样品进行紫外漂白 ,然后测量它们紫外吸收变化光谱 ,通过色心模型K K关系预言折射率变化量 ,并用色心模型理论对实验结果进行了分析讨论 ,最后得出一些重要结论。

In this paper we studied on the UV-induced refractive index changes o f a boron-codoped germanosilicate preform used for the fabrication of fiber gr atings Two groups of performs,non H 2 loaded preform and H 2 loade d preform,have been exposed to UV beam at various pulse energy densities and pul s e numbers,and their UV-induced excess losses have been measured The correspon din g refractive-index changes have been determined through a Kramers-Kroning anal y sis Also,our experimental results were discussed and analyzed according to the c olor-center model of photosensitivity,and then some important conclusions were obtained by us