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Strain Sensing Characteristics of Fiber Laser Based on Saturable Absorption Frequency Stabilization Technology
Author(s): YANG Runtao, ZHU Lianqing, ZHANG Zuomin, LIU Feng, LOU Xiaoping
Pages: 201-
205
Year: 2016
Issue:
3
Journal: Nanotechnology and Precision Engineering
Keyword: fiber Bragg grating; ring cavity; Er-doped fiber; saturable absorber; sensitivity;
Abstract: A ring cavity Er-doped fiber laser sensor based on fiber Bragg grating ( FBG) was proposed, and stable laser output was acquired together with fiber saturable absorption frequency stabilization tech-nology, which has been successfully applied to the strain sensor. The laser sensor uses 980 nm LD as pump source and 2 m Er-doped fiber as gain medium. An un-pumped Er-doped fiber was employed as saturable absorber to form an optical narrow-bandwidth filter, and a FBG with high reflectivity as coarse wavelength selective component. In the experiment, a stable laser output was achieved when the optimum length of saturable absorber was 4 m, the 3 dB bandwidth of output spectrum was less than 0. 2 nm, the side-mode suppression ratio greater than 70 dB, and the threshold current of the fiber laser 63. 3 mA. The output of ring fiber laser was tunable with the wavelength change of frequency selective grating, sens-ing the strain of the uniform strength beam. The strain sensing characteristics of the laser were studied. Within the range of 0—2100 με, the output peak wavelength of Er-doped fiber laser sensor was meas-ured. Experimental results show that the laser sensor enjoys a good linearity and repeatability and that linear fitting of the laser sensor is higher than 0. 999 .
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