材料科学
扩散
长周期光纤光栅
光纤
纤维
栅栏
热的
光学
光电子学
题字图形
兴奋剂
折射率
复合材料
渐变折射率纤维
光纤传感器
物理
热力学
几何学
数学
作者
Xiang Shen,Bin Dai,Yingbin Xing,Lüyun Yang,Haiqing Li,Jinyan Li,Jingang Peng
出处
期刊:Sensors
[MDPI AG]
日期:2018-05-08
卷期号:18 (5): 1475-1475
被引量:6
摘要
We demonstrated a kind of long-period fiber grating (LPFG), which is manufactured with a thermal diffusion treatment.The LPFG was inscribed on an ultrahigh-numerical-aperture (UHNA) fiber, highly doped with Ge and P, which was able to easily diffuse at high temperatures within a few seconds.We analyzed how the elements diffused at a high temperature over 1300 • C in the UHNA fiber.Then we developed a periodically heated technology with a CO 2 laser, which was able to cause the diffusion of the elements to constitute the modulations of an LPFG.With this technology, there is little damage to the outer structure of the fiber, which is different from the traditional LPFG, as it is periodically tapered.Since the LPFG itself was manufactured under high temperature, it can withstand higher temperatures than traditional LPFGs.Furthermore, the LPFG presents a higher sensitivity to high temperature due to the large amount of Ge doping, which is approximately 100 pm/ • C. In addition, the LPFG shows insensitivity to the changing of the environment's refractive index and strain.
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