A femtosecond laser-inscribed fine-core long-period grating with low temperature sensitivity
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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 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 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。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.
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图 1飞秒 直写LPG的实验装置示意图
Figure 1.Schematic of experimental device for femtosecond laser direct writing LPG
图 2LPG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
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
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
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
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
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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