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研究了一种新型光纤激光器——消逝波激励的回音壁模式光纤激光器的阈值特性.将不同直径的石英光纤分别浸入低折射率的罗丹明6G乙醇和乙二醇混合溶液中,采用沿光纤轴向光抽运消逝波激励染料增益的方式,发现回音壁模式光纤激光辐射的阈值能量和混合溶液的折射率存在不同的依赖关系.随折射率的增加,对小直径光纤,阈值能量随之增加;对大直径光纤,阈值能量单调缓慢递减;对直径适中的光纤,阈值能量先减后增,存在一个和最小阈值能量对应的最佳折射率.用消逝波激励的回音壁模式激光理论,导出了回音壁模式光纤激光的阈值能量公式.理论计算曲线和不同直径的光纤阈值能量实验数据完全符合.
The threshold characteristics of a new fiber laser-evanescent wave-driven whispering gallery mode fiber laser were studied.Different diameters of silica fibers were dipped into low-index Rhodamine 6G ethanol and ethylene glycol mixed solution, It is found that there is a different dependence of the threshold energy of the whispering gallery mode fiber laser radiation on the refractive index of the mixed solution by the way of pumping the evanescent wave excitation dye gain. With the increase of the refractive index, the threshold energy increases with the increase of the refractive index For large diameter fibers, the threshold energy monotonically decreases slowly, and for moderate diameter fibers, the threshold energy decreases first and then increases, and there exists an optimum refractive index corresponding to the minimum threshold energy. By using evanescent wave-driven whispering gallery mode laser theory, The threshold energy formula of the echo-wall-mode fiber laser is completely consistent with the theoretical calculation curves and experimental data of the fiber threshold energy with different diameters.