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提出了一种环形光纤激光用于光纤传感的方法,结合光纤可饱和吸收体稳频技术,获得稳定的激光输出,并成功将其应用于应变传感.使用980 nm激光二极管作为泵浦源,长度为2 m的掺铒光纤作为增益介质,通过光环形器引入未泵浦的掺铒光纤作为可饱和吸收体形成窄带滤波器,并选用高反射率光纤光栅作为波长选择元件.可饱和吸收体长度为4 m时获得了稳定的激光输出,输出3 d B带宽小于0.2 nm,边模抑制比大于70 d B,阈值电流为63.3 m A.通过选频光纤光栅对等强度梁应变的感知引起的光纤激光输出调谐,实现0~2 100με应变传感检测,对这种掺铒光纤激光的应变特性进行了实验研究,得到了应变与激光峰值波长的线性关系.实验结果表明:该激光传感器获得了很好的线性度和重复度,线性拟合度高于0.999.
A method of ring-shaped fiber laser for fiber sensing was proposed, which combined with frequency stabilization of fiber saturable absorber to obtain a stable laser output and successfully applied it to strain sensing.Using a 980 nm laser diode as pump source , A length of 2 m of erbium-doped fiber as a gain medium, the introduction of non-pump erbium-doped optical fiber through the optical circulator as a saturable absorber to form a narrow-band filter, and the selection of high-reflectivity fiber grating as a wavelength-selective element. Saturable absorption A stable laser output was obtained at a body length of 4 m with an output 3 d B bandwidth of less than 0.2 nm, a side mode suppression ratio of greater than 70 d B, and a threshold current of 63.3 m A. Sensing of Strain Beam Equivalent Beam by a Fiber Grating The fiber laser output is tuned to achieve 0 ~ 2 100με strain sensing detection, the strain characteristics of this erbium-doped fiber laser are experimentally studied, and the linear relationship between strain and laser peak wavelength is obtained.The experimental results show that the laser sensor Good linearity and repeatability were obtained with a linear fit of above 0.999.