光学
材料科学
光纤布拉格光栅
包层(金属加工)
折射率
飞秒
包层模式
归一化频率(单位)
激光器
阶跃索引配置文件
渐变折射率纤维
单模光纤
磷
栅栏
光纤
光电子学
波长
光纤传感器
保偏光纤
物理
冶金
频率合成器
相位噪声
锁相环
作者
Haiyan Qu,Zhe Chen,Shixin Gao,Rui Min,Getinet Woyessa,Ole Bang,Heng Wang,Christophe Caucheteur,Xuehao Hu
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-03-07
卷期号:48 (6): 1438-1438
被引量:1
摘要
In this Letter, we demonstrate 8°-tilted fiber Bragg grating (TFBG) inscription in single-mode step-index TOPAS/ZEONEX polymer optical fibers (POFs) using a 520 nm femtosecond laser and the line-by-line (LbL) writing technique. As a result of the tilt angle and the fiber refractive index, a large spectral range of cladding mode resonances covering 147 nm is obtained. The evolution of the transmitted spectrum is analyzed as a function of the surrounding refractive index (SRI) in a large range from 1.30 to 1.50. The cutoff cladding mode shows a refractive index sensitivity of 507 nm/RIU (refractive index unit). For single-resonance tracking near the cutoff mode, the sensitivity is at least 6 nm/RIU, depending on the exact wavelength position of the cladding modes. The main originality of our work is that it produces, for the first time, to the best of our knowledge, a TFBG in POF that operates in the refractive index range of aqueous solutions. The sensing capability for a large range of refractive index values is also relevant for (bio)chemical sensing in different media.
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