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采用光学度规模型，研究了光子在轴对称介质中的运动轨道，分析了光子在不稳定轨道附近的行为，进而讨论了它在激活介质中的受激发射。
Using the optical scale, the orbits of photons in an axisymmetric medium are studied, and the behavior of photons in the vicinity of an unstable orbit is analyzed. Then the stimulated emission of photons in an active medium is discussed.