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采用沿光纤轴向光抽运消逝场激励增益的方式,获得了沿光纤轴向较长范围的回音壁模式激光辐射.研究了这种激光器的激光产生长度与抽运能量间的关系.实验发现当抽运能量刚超过激光产生阈值时,激光产生长度迅速增长;随抽运能量的继续增加,产生长度的增长趋势变缓;产生长度随抽运能量的变化关系决定于增益包层溶液的染料浓度和溶液折射率.根据抽运光沿光纤轴向以受抑全反射方式传播的物理特性,在抽运能量中引入了遵循比尔吸收定律的指数衰减函数,结合消逝场激励增益的回音壁模式激光理论,在分析系统增益和损耗的基础上由激光阈值条件推导出了激光沿光纤轴向的产生长度与抽运能量关系的理论公式,理论计算结果和与实验数据符合甚好.
The echo wall mode laser radiation along the axial direction of the optical fiber was obtained by means of the optical pumped evanescent field along the axial direction of the optical fiber.The relationship between the laser generated length and the pumping energy of this laser was studied. When the pumping energy just exceeds the threshold of laser generation, the length of laser generation increases rapidly. With the continuous increase of pumping energy, the increasing trend of generating length slows down. The relationship between the generating length and the pumping energy depends on the dye in the gain cladding solution Concentration and solution refractive index.According to the physical property that the pump light propagates along the axial direction of the fiber in frustrated total reflection mode, an exponential decay function following the Beer’s law of absorption is introduced into the pump energy, and the echo wall mode incorporating evanescent field excitation gain Based on the analysis of system gain and loss, the theoretical formula of the laser axial length along the fiber axis is derived from the laser threshold condition. The theoretical calculation results are in good agreement with the experimental data.