提出了一种基于45°倾斜光纤光栅和光纤布拉格光栅的线性腔结构的可调谐线偏振掺镱光纤激光器。利用45°倾斜光纤光栅作为起偏器件实现了中心波长为1065.90 nm、3 dB带宽为0.03 nm、偏振消光比高于35 dB的线偏振激光输出,输出激光的偏振消光比在4 h内稳定性良好。基于光纤布拉格光栅反射波长的温度特性实现了中心波长在1065.92~1066.87 nm范围内的连续可调,在波长可调谐状态下输出激光的偏振消光比保持在30 dB以上。

A tunable, linearly polarized Yb-doped fiber laser, based on a 45°-tilted fiber grating and a fiber Bragg grating with a linear cavity, is proposed. The use of the tilted fiber grating as a linear polarizer provides an output laser with a central wavelength of 1065.90 nm, a 3 dB bandwidth of 0.03 nm, and a polarization extinction ratio higher than 35 dB. The polarization extinction ratio remains stable for 4 h. The temperature characteristics of the beam reflected by the fiber Bragg grating make the central wavelength continuously tunable in the range of 1065.92--1066.87 nm; during the tuning operation, the output polarization extinction ratio is maintained at ≥30 dB.