Refractive Index Sensor Based on Fiber Ring Laser
Refractive Index Sensor Based on Fiber Ring Laser
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DOI：
10.1109/lpt.2015.2495339
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发表时间：
2016-02
影响因子：
2.6
通讯作者：
Xinpu Zhang;Zigeng Liu;Lingxiao Xie;W. Peng
中科院分区：
文献类型：
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作者：
Xinpu Zhang;Zigeng Liu;Lingxiao Xie;W. Peng
在这封信中，我们研究了一种新的折射率传感器基于一个简单的光纤环形激光器结合弯曲光纤滤波器。弯曲纤维结构作为光纤滤波器和传感元件。弯曲光纤滤波器由一段具有选定弯曲半径的半圆形裸标准单模光纤制成。增益介质（掺铒光纤）由波长为980nm的激光器泵浦。使用弯曲半径为4.5 mm的弯曲光纤滤波器，可获得1557.3 nm左右的低泵浦阈值激光发射。该激光器的3db带宽小于0.3 nm，有利于实现高精度传感。介质折射率在1.3259 ~ 1.3730范围内变化，激光波长与介质折射率呈线性关系，线性关系约为60 nm/RIU。最后，我们制作了不同弯曲半径的传感器原型。当选择4 mm弯曲半径时，最大灵敏度为124 nm/RIU。所提出的折射率传感器制作简单，成本效益高，具有潜在的传感应用前景。
In this letter, we investigate a novel refractive index sensor based on a simple fiber ring laser incorporating a bent fiber filter. The bent fiber structure acted as a fiber filter and a sensing element. The bent fiber filter is made of a section of semicircular bare standard single-mode fiber with a selected bending radius. The gain medium (erbium-doped fiber) is pumped by a 980 nm wavelength laser. Laser emission around 1557.3 nm with a low pumping threshold is obtained when a bent fiber filter with 4.5 mm bending radius is used. The 3 dB bandwidth of the laser is less than 0.3 nm, which is beneficial to high precision sensing. The medium refractive index varied from 1.3259 to 1.3730, and the relationship between the lasing wavelength and the medium refractive index exhibited linear behavior, where good linearity of about 60 nm/RIU was obtained. Finally, we fabricated sensor prototypes with different bending radii. When a 4 mm bending radius was selected, the maximum sensitivity is 124 nm/RIU. The fabrication of the proposed refractive index sensor is simple and cost-effective, which makes it a good candidate for the potential sensing applications.