Enhanced temperature characteristics of strain-assisted fiber Bragg gratings inscription by femtosecond laser pulses
Enhanced temperature characteristics of strain-assisted fiber Bragg gratings inscription by femtosecond laser pulses
复制标题
DOI：
10.1016/j.sna.2020.112435
复制
发表时间：
2021
影响因子：
4.6
通讯作者：
Xinran Dong;Haifeng Du;Li Zeng;Dong-kai Chu;Kai Yin;Xiao-yan Sun;Ji’an Duan
中科院分区：
文献类型：
--
作者：
Xinran Dong;Haifeng Du;Li Zeng;Dong-kai Chu;Kai Yin;Xiao-yan Sun;Ji’an Duan
采用飞秒激光掩模相位法制备了应变辅助光纤布拉格光栅（S-FBG）。研究了不同预应力FBG的光谱特性。研究发现，随着施加应变的增加，S-FBG 的波长线性向较短波长方向移动，并且在应力释放之前和之后分别表现出 0.1596 pm/με 和 0.8796 pm/με 的灵敏度。此外，S-FBG表现出比普通FBG更好的温度特性，包括更小的反射强度衰减率、更小的波长滞后效应和更好的高温稳定性。同时，温度测试表明，预应力较大的S-FBG表现出更好的温度特性。此外，S-FBG具有尺寸紧凑、易于制造和高反射等优点，在开发高温传感平台方面受到高度关注。
A strain assisted fiber Bragg grating (S-FBG) has been fabricated by using femtosecond laser mask phase method. The spectral characteristics of the FBG with different pre-stress has been investigated. It was found that the wavelengths of the S-FBGs shift linearity towards shorter wavelength direction as the applied strain increases and show a sensitivity of 0.1596 pm/με and 0.8796 pm/με before and after the stress released, respectively. Moreover, the S-FBGs show better temperature characteristics than the normal FBG, including smaller decay rate of the reflection intensity, smaller wavelength hysteresis effect and better high temperature stability. Meanwhile, the temperature test has demonstrated that the S-FBG with larger pre-stress shows better temperature characteristics. In addition, the S-FBG has advantages of compact size, easy fabrication and high reflection, which is of high interest in developing high temperature sensing platforms.