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为了研究分布反馈光纤激光器的弯曲特性,对光纤激光器输出波长和弯曲半径的关系进行了理论分析和实验研究.理论分析表明,光纤激光器输出波长变化量与弯曲半径平方的倒数为线性相关,并且随着弯曲半径的增大布拉格波长向短波长方向移动;实验中通过对3支不同波长的光纤激光器在弯曲半径分别为10 mm、20 mm9、0 mm时输出波长的测量,验证了理论分析的正确性.实验中采用参考光纤激光器法排除环境干扰,对光纤激光器的激射功率进行了耐弯曲测试,并验证了光纤激光器斜率效率优越的抗弯曲特性.结果表明,在测试的32天内,待测光纤激光器激射功率变化量均小于2 dB,为分布反馈光纤激光器做为弯曲类传感应用的研究提供了重要的参考依据.
In order to study the bending characteristics of distributed feedback fiber laser, theoretical analysis and experimental research on the relationship between output wavelength and bending radius of fiber laser are carried out. The theoretical analysis shows that the output wavelength of fiber laser linearly correlates with the reciprocal of square of bending radius, The bending wavelength increases with the increase of Bragg wavelength to the short wavelength. In the experiment, by measuring the output wavelength of three different fiber lasers with bending radius of 10 mm, 20 mm9 and 0 mm respectively, the theoretical analysis is validated In the experiment, the reference fiber laser was used to exclude environmental interference, and the laser power of the fiber laser was tested for its bending resistance, and the anti-bending property of the fiber laser with superior slope efficiency was verified.The results showed that in the 32 days of the test, The variation of lasing power of fiber lasers is less than 2 dB, which provides an important reference for the research of distributed feedback fiber lasers as bending class sensing applications.