虽然染料溶液的折射率低于容器的折射率,但由于光波在容器内表面掠射时具有的高反射率以及染料溶液的高增益性质,使得接触容器内表面的“漏波”仍可以支撑一定数量的低阶漏模。而且由于泵浦光及激光束本身对染料溶液的作用,将造成溶液内折射率的非均匀分布,因而使得溶液本身也具有“自导”的作用。我们的实验及拍摄的照片证实了这样的分析。

Although the refractive index of the dye solutions is lower than that of the cell material, the reflectivity is high as the light beam grazes at the inner surface of the cell and the solution is of high gain, a number of low order leaky modes can be supported by the leaky waves. Furthemore, the influence of the pump light and the laser beam on the dye solution will bring about the nonuniform distribution of the refractive index of the solution, so the solution can be self-guided. Our experiments and the photos have proved the above analysis.