提出一种基于45°倾斜光纤光栅(45°-TFG)辐射模的线偏振光纤激光器。利用环形谐振腔结构和光纤布拉格光栅,搭建了基于45°-TFG辐射模的线偏振调谐光纤激光器,首次实现了基于TFG辐射模的全光纤单偏振激光输出。实验结果显示,当输入泵浦光功率大于24 mW时,可实现稳定的激光输出,输出激光的中心波长为1553.45 nm,3 dB带宽为0.05 nm,偏振度高达99.8%,激光器系统的斜率效率为10.79%。同时,利用布拉格光纤光栅的温度敏感特性,实现了激光器波长输出从1553.21 nm到1554.03 nm的调谐,调谐灵敏度为11.37 pm/℃。

In this study, we propose a linear polarized fiber laser based on the radiation mode of a 45°-tilted fiber grating (45°-TFG). The laser is constructed using a ring resonator structure and a fiber Bragg grating, and an all-fiber single-polarized laser output based on the radiation mode of the TFG is realized for the first time. The experimental results show that when the input pump light power is greater than 24 mW, a stable laser output can be achieved. The central wavelength of the output laser is 1553.45 nm, that of a 3-dB bandwidth is 0.05 nm, degree of polarization is up to 99.8%, and slope efficiency of the laser system is 10.79%. Simultaneously, with the help of the temperature sensitivity of the fiber Bragg grating, the central wavelength of the output can be continuously tuned from 1553.21 nm to 1554.03 nm, and the tuning sensitivity is 11.37 pm/℃.