应用800nm飞秒激光制备长周期光纤光栅  

Inscription of long period fiber gratings using 800 nm femtosecond laser

作　　者：苗飞[1] 张玲[1] 冯德军[2] 隋青美[1] 陈霄[1] 贾磊[1] 刘汉平[3] 刘辉兰[3] 

机构地区：[1]山东大学控制科学与工程学院,山东济南250061 [2]山东大学信息科学与工程学院,山东济南250100 [3]德州学院物理系,山东德州253023

出　　处：《光学精密工程》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)

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.

关 键 词：长周期光纤光栅 飞秒激光 光栅制备 高温传感 

分 类 号：TN305.7[电子电信—物理电子学] TN253