飞秒激光刻写低温度灵敏度的细芯长周期光栅

明昕宇; 国旗; 薛兆康; 潘学鹏; 陈超; 于永森

doi:10.37188/CO.2020-0015

飞秒激光刻写低温度灵敏度的细芯长周期光栅

doi: 10.37188/CO.2020-0015

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

基金项目: 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)

详细信息

作者简介:
明昕宇(1994—)，男，黑龙江佳木斯人，硕士研究生，2013年于吉林大学获得学士学位，现为吉林大学电子科学与工程学院硕士研究生，主要从事光纤传感方面的研究。E-mail：519113175@qq.com

于永森(1974—)，男，吉林长春人，教授，博士生导师，2005年于吉林大学获得博士学位，现为吉林大学电子科学与工程学院教授，主要从事光纤传感，激光微纳加工研究。E-mail：yuys@jlu.edu.cn

中图分类号: TN253
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出版历程
- 收稿日期: 2020-01-21
- 修回日期: 2020-02-25
- 刊出日期: 2020-08-01

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

1.
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
2.
State Key Laboratory of Luminescence and Application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Funds: Supported by National Natural Science Foundation of China (No.91860140，No.618741119); Technology Development Project of Jilin Province (No.20180201014GX)

More Information

Corresponding author: yuys@jlu.edu.cn

摘要

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6 μm的单模光纤上成功制备了周期为50 μm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 °C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1.4065~1.4265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。
- 细芯光纤 /
- 飞秒激光直写 /
- 光纤传感 /
- 长周期光栅
Abstract: 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 50 μm was successfully prepared on a single-mode fiber with a core diameter of 6 μm using the femtosecond laser direct writing method. The results show that long-period 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 °C 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.
- fine-core fiber /
- femtosecond laser direct writing /
- fiber sensor /
- long-period fiber gratings

HTML全文

图 1 飞秒激光直写LPG的实验装置示意图

Figure 1. Schematic of experimental device for femtosecond laser direct writing LPG

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图 2 LPG的CCD照片与光纤横截面显微镜照片

Figure 2. CCD photo of LPG and fiber cross section microscope photo

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图 3 FC-LPG透射光谱

Figure 3. FC-LPG transmission spectrum

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图 4 退火过程谐振波长随温度变化曲线

Figure 4. Relationship between resonance wavelength and temperature during annealing

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图 5 退火前后透射峰对比图

Figure 5. Comparison of transmission peaks before and after annealing

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图 6 退火后谐振波长随温度变化曲线

Figure 6. Resonance wavelength varying with temperature after annealing

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图 7 不同纤芯直径的单模光纤光栅透射谱对比

Figure 7. Comparison of transmission spectra of single-mode fiber gratings with different core diameters

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图 8 纤芯直径为9 μm的光纤中刻写的LPG的温度响应测试

Figure 8. Temperature response test of LPG written in optical fiber with a core diameter of 9 μm

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图 9 透射峰随折射率变化灵敏度曲线以及波长漂移曲线

Figure 9. Refractive index response curve and sensitivity curve

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图 10 谐振波长与应变拟合曲线以及光谱漂移曲线

Figure 10. Resonance wavelength and strain fitting curve and spectral drift curve

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