飞秒激光刻写低温度灵敏度的细芯长周期光栅  

A femtosecond laser-inscribed fine-core long-period grating with low temperature sensitivity

作　　者：明昕宇 国旗 薛兆康 潘学鹏 陈超[2] 于永森[1] MING Xin-yu;GUO Qi;XUE Zhao-kang;PAN Xue-peng;CHEN Chao;YU Yong-sen(State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China;State Key Laboratory of Luminescence and Application,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]吉林大学,电子科学与工程学院,集成光电子国家重点实验室,吉林长春130012 [2]中国科学院,长春光学精密机械与物理研究所,发光学及应用国家重点实验室,吉林长春130033

出　　处：《中国光学》2020年第4期737-744,共8页Chinese Optics

基　　金：国家自然科学基金项目(No.91860140,No.618741119);吉林省科技发展规划项目(No.20180201014GX)。

摘　　要：在折射率与应变测试时,为了降低温度影响所引起的串扰,对细芯长周期光纤光栅的温度、折射率和应变响应特性进行了研究。通过飞秒激光直写方法在纤芯直径为6μm的单模光纤上成功制备了周期为50μm的长周期光纤光栅。结果表明:在细芯光纤中以低激光能量加工的长周期光纤光栅具有较低的温度灵敏度,同时保持较大的消光比和较好的光谱质量。这种细芯长周期光纤光栅损耗峰在20~700℃温度范围内仅漂移1.7 nm。该光栅对折射率变化也具有较好的响应,环境折射率在1.406 5~1.426 5时,灵敏度最高可达882.51 nm/RIU,应变灵敏度为-2.2 pm/με。这种细芯长周期光纤光栅可以较好地降低折射率与应变测试中由于温度影响带来的串扰。In order to reduce crosstalk caused by temperature during refractive index and strain testing,the temperature,refractive index and strain response characteristics of fine-core long-period fiber gratings were studied.A long-period fiber grating with a period of 50μm was successfully prepared on a single-mode fiber with a core diameter of 6μm using the femtosecond laser direct writing method.The results show that longperiod fiber gratings processed with low laser energy in fine-core fibers have lower temperature sensitivity,and maintain a larger extinction ratio and better spectral quality.The loss peak of this fine-core long-period fiber grating drifts only 1.7 nm in the 20~700℃ temperature range.The grating is also highly responsive to changes in the refractive index.when ambient refractive index is in the range of 1.4065~1.4265,its sensitivity reaches 882.51 nm/RIU,and its strain sensitivity is−2.2 pm/με.This fine-core long-period fiber grating can better reduce crosstalk caused by temperature in the refractive index and strain tests.

关 键 词：细芯光纤 飞秒激光直写 光纤传感 长周期光栅 

分 类 号：TN253[电子电信—物理电子学]