摘要
利用800nm钛蓝宝石飞秒激光器制备了长周期光纤光栅,并实验验证了长周期光纤光栅的高温特性。基于摄像头和电动位移平台设计了激光精确对准光纤纤芯的方案;以计算机控制1.3mW飞秒激光,使用逐点曝光法在未经载氢处理的光纤上刻写了长周期光纤光栅,实验显示该光栅在1 200~1 700nm波段的主谐振峰值可达-17dB。利用高温箱对长周期光纤光栅进行高温传感特性实验,在300~800℃得到的主谐振峰温度响应灵敏度为0.056nm/℃,线性度为0.992。实验结果表明,提出的以800nm钛蓝宝石飞秒激光器制备长周期光纤光栅的方法稳定可靠,写制的光栅在高温环境下变化均匀,不易退化,响应特性良好,适用于高温检测。
Long Period Fiber Gratings(LPFGs) were inscribed by using a 800 nm femtosecond laser and their high-temperature properties were verified in this paper.Firstly,an inscription system for the laser into fiber cores was designed using a camera and an electric moving platform.With controlling a pulse laser of 1.3 mW,a LPFG was inscribed in a non-hydrogen-loaded bare fiber using point by point technique,and the resonant peak of the LPFG is about-17 dB in the 1 200~1 700 nm band.Then,high temperature sensing experiments were performed on the LPFG by a high temperature box,obtained results show that the linearity of the resonance peak changes is about 0.992 and temperature sensitivity is 0.056 nm/℃ at 300-800 ℃.It demonstrates that the inscription technology for LPFGs by using the 800 nm femtosecond laser is feasible and obtained LPFGs have good response characteristics and stability,and are suitable for the high-temperature measurement.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2012年第4期685-691,共7页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.61074163)
山东省高校科研发展计划资助项目(No.J10LA54)
关键词
长周期光纤光栅
飞秒激光
光栅制备
高温传感
long period fiber grating
femtosecond laser
grating inscription
high-temperature sensing