求解了经典电磁场中二能级原子系统的密度矩阵演化方程，得到了系统状态的相干特性。
We have found out the equation of density matrix evolution of the two-level atomic system in the classic electromagnetism field. The Law of coherence of the state is obtained.
在光与二能级原子系统相互作用的基础上，我们导出相互作用孤立波方程组及其精确解，以及存在解的两个必要条件。
On the basis of light interaction with two-level atomic system, we derive the interaction solitary wave equations, its solution and two necessary conditions for the existence of the solution.
在光与二能级原子系统相互作用的基础上，我们导出相互作用孤立波方程组及其精确解，以及存在解的两个必要条件。
On the basis of light interaction with two-level atomic system, we derive the interaction solitary wave equations, its solution and two necessary conditions for the existence of the solution.
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