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研究了一种单双波长可切换的线偏振掺镱双包层光纤激光器结构,腔内插入可以绕光轴方向旋转的立方体偏振分束器(PBS)进行偏振控制,实现单双波长的转换。激光谐振腔由高反射率的双色镜和较低反射率(10.2%)的保偏光纤布拉格光栅(PM-FBG)构成;由于保偏光纤光栅的偏振选择反馈作用增强了偏振烧孔效应,通过调节谐振腔内偏振分束器的旋转角度实现了激光的单双波长之间的切换。利用琼斯矩阵理论分析了偏振态与旋转角度的关系,其结果与实验结果吻合。实验中输出激光的双波长为1070.08nm和1070.39nm、功率为1W、激光信噪比为48dB、斜率效率为34%、3dB带宽为0.02nm。利用格兰汤姆孙棱镜对该激光的偏振特性进行了研究:单波长运转时为线偏振激光,偏振度达13.37dB;双波长运转时为正交偏振激光。
A single-and double-wavelength switchable linear polarization-doped ytterbium-doped double-clad fiber laser is studied. Polarization control is performed in the cavity by a cubic polarization beam splitter (PBS) rotating around the optical axis to realize single-and double-wavelength conversion. The laser resonator consists of a high-reflectivity dichroic mirror and a low-reflectivity (10.2%) polarization maintaining fiber Bragg grating (PM-FBG); polarization polarization feedback is used to enhance polarization hole burning effect by Adjusting the rotation angle of the polarization beam splitter in the cavity realizes switching between the single and dual wavelengths of the laser. The relationship between polarization state and rotation angle is analyzed by using Jones matrix theory. The results are in good agreement with the experimental results. Experimental output laser dual wavelength 1070.08nm and 1070.39nm, power 1W, laser signal to noise ratio of 48dB, slope efficiency of 34%, 3dB bandwidth of 0.02nm. The polarization characteristics of the laser were studied by using the Glan Thompson prism. The linear polarization laser was used in the single wavelength operation, the polarization degree was 13.37dB, and the orthogonal polarization laser was used in the dual wavelength operation.