Ultrashort fiber Bragg grating written by femtosecond laser and its sensing characteristics
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摘要:为了提高光纤光栅传感器的测量精度及可靠性，实现点式测量，拓宽光纤布拉格光栅（FBG）的应用，本文提出了基于飞秒 直写扫线技术制备超短FBG。首先，在单模光纤上制备了周期为5.35 μm、长度为53.5 μm的超短FBG，其温度和应力的灵敏度分别为0.011 nm/℃和1.509 nm/N；然后，用体积分数为4%的氢氟酸对制备超短FBG进行选择性腐蚀，制备出了微通道超短FBG，并研究了它对NaCl溶液的传感特性，其折射率灵敏度为69.11 nm/RIU。结果表明，这种微通道超短FBG具有高重复性、高可靠性、可多参数测量等优点。Abstract:In order to improve the measurement accuracy and reliability of fiber grating sensors, realize the single-point measurement ability and broaden the application of fiber Bragg grating (FBG), an ultrashort FBG is fabricated based on the femtosecond laser direct writing technique in this paper. The ultrashort FBG with a period of 5.35 μm and a length of 53.5 μm is fabricated in single mode fiber, and its temperature sensitivity and stress sensitivity are 0.011 nm/℃ and 1.509 nm/N, respectively. Then, a microchannel ultrashort FBG based on ultrashort FBG is fabricated by selective corrosion with a volume fraction of 4% hydrofluoric acid, and its sensing property to NaCl solution is studied. The refractive index sensitivity of the microchannel ultrashort FBG is 69.11 nm/RIU. The microchannel ultrashort FBG has the advantages of high repeatability and multi-parameter measurement.
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图 1(a)飞秒 刻写示意图；(b)基于微通道的光纤超短FBG结构示意图
Figure 1.(a) Schematic diagram of femtosecond laser writting; (b) Schematic diagram of microchannel ultrashort FBG structure
图 2基于微通道的超短FBG的显微照片。(a)侧视图；(b)俯视图
Figure 2.Micrographs of microchannel ultrashort FBG. (a) Side view; (b) Top view
图 4未腐蚀超短FBG温度特性。(a)衍射峰波长随外界温度变化的漂移; (b)衍射峰波长和温度的线性关系
Figure 4.Temperature characteristics of uncorroded ultrashort FBG. (a) Wavelength shifts of diffraction peak with the change of surrounding temperature; (b) Linear relationship between the wavelength of diffraction peak and temperature
图 5未腐蚀超短FBG的应力特性。(a)衍射峰波长随外界应力变化的漂移; (b)衍射峰波长与外界应力的线性关系
Figure 5.`Stress characteristics of uncorroded ultrashort FBG. (a) Wavelength shifts of diffraction peak with the change of surrounding stress; (b) Linear relationship between the wavelength of diffraction peak and stress
图 6基于微通道的超短FBG反射光谱随外界折射率的漂移
Figure 6.Shift of reflection spectra of microchannel ultrashort FBG with surrounding refractive index
图 7基于微通道的超短FBG的折射率响应特性。(a)衍射峰波长随外界折射率变化的漂移; (b)衍射峰的波长漂移和外界折射率的线性关系
Figure 7.Refractive index response characteristics of microchannel ultrashort FBG. (a) Wavelength shifts of diffraction peak with the change of surrounding refractive index; (b) Linear relationship between wavelength shifts of diffraction peak and surrounding refractive index
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