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研究了偏斜光线抽运下的回音壁模式光纤激光辐射特性.实验发现,在抽运光以偏斜光线方式沿光纤的近轴向抽运时,回音壁模式的光纤激光辐射中,既存在光电矢量和光纤径向垂直的横电波(TE),也存在光电矢量和光纤径向平行的横磁波(TM);随增益包层染料溶液折射率的增加,径向模式数和角模式数相同的TE波和TM波之间的波长差单调减小,回音壁模式激光辐射的中心波长向短波方向移动,辐射的波长范围变窄.用回音壁模式激光的辐射理论结合激光染料的四能级模型,满意地解释了实验结果.
The characteristics of whispering gallery mode fiber laser radiation under skew light pumping are studied.The experimental results show that there exists both the fiber wall radiation in the whispering gallery mode when the pumping light is deflected by the light beam in the paraxial direction of the optical fiber, The transverse vector (TE) of the photoelectric vector and the radial direction of the optical fiber are perpendicular to each other, and there is also a transverse magnetic wave (TM) of the photoelectric vector and the radial direction of the optical fiber parallel to the fiber. With the increase of the refractive index of the gain- The wavelength difference between the TE wave and the TM wave monotonically decreases, the central wavelength of the echo wall mode laser radiation moves toward the short wave direction, and the wavelength range of the radiation is narrowed. With the radiation theory of the whispering gallery mode laser and the four-level The model satisfactorily explained the experimental results.