J. F. Kuhne, R. Nadas, P. L. Inacio, I. Chiamenti, Ricardo C. Kamicawachi, H. Kalinowski
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引用次数: 3
摘要
利用248 nm的飞秒激光,将波长峰以673.07 nm为中心的可见光光纤布拉格光栅(Vis-FBG)嵌入到红外多模光纤中。在氢氟酸溶液中(40%)化学蚀刻去除纤维包层。通过将传感器浸入不同浓度的折射率范围为1.3328 ~ 1.4607的稀释甘油溶液中来测定传感器的折射率响应。比较了可见光光纤光栅与直径相近的红外刻蚀光纤光栅的性能。Vis-FBG传感器的灵敏度为15.71nm/RIU,折射率为1.4607,分辨率为6.34 x 10-3 RIU。
Refractive index sensitivity in etched FBG in the visible range
A visible fiber Bragg grating (Vis-FBG) with wavelength peak centered at 673.07 nm was inscribed in a multimode fiber designed for infrared (IR) operation using a femtosecond (fs) laser emitting at 248 nm. The fiber cladding is removed by chemical etching in hydrofluoric acid solution (40%). The sensor refractive index response is determined by dipping the sensor into diluted glycerin solution at different concentrations with refractive index range from 1.3328 to 1.4607. The Vis-FBG performance is compared with an IR etched FBG (EFBG) with similar diameter. The sensitivity found for the Vis-FBG sensor is 15.71nm/RIU with a 6.34 x 10-3 RIU resolution for a refractive index of 1.4607.