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

Volume 13 Issue 4

Aug. 2020

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Chinese Optics > 2020 > 13(4): 737-744.

MING Xin-yu, GUO Qi, XUE Zhao-kang, PAN Xue-peng, CHEN Chao, YU Yong-sen. A femtosecond laser-inscribed fine-core long-period grating with low temperature sensitivity[J]. Chinese Optics, 2020, 13(4): 737-744. doi: 10.37188/CO.2020-0015

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MING Xin-yu, GUO Qi, XUE Zhao-kang, PAN Xue-peng, CHEN Chao, YU Yong-sen. A femtosecond laser-inscribed fine-core long-period grating with low temperature sensitivity[J]. Chinese Optics, 2020, 13(4): 737-744. doi: 10.37188/CO.2020-0015

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

doi: 10.37188/CO.2020-0015

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)

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Corresponding author: yuys@jlu.edu.cn
Received Date: 21 Jan 2020
Rev Recd Date: 25 Feb 2020
Publish Date: 01 Aug 2020

Abstract

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

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References(38)

References

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

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