激光与三个两能级原子相互作用

The Interaction between the Laser Field and Three Two-Level Atoms

本文研究激光场与三个原子的相互作用，激光场用相干态描述，原子用自旋态描述。在不同的初始条件下，得到了光子数和原子状态随时间的变化关系。光子数很大时，量子理论结果与半经典理论结果是一致的。

In this paper, the interaction between the single laser field and three two-level atoms are studied. A method utilzing the coherent states variables for the laser field and appropriate spin states variables for two-level atoms is developed. The temporal development of the photon number, as well as the motion of each atoms under different initial states are obtained. In the case when the number of photons are very large, the result obtained in quantum theory consists with the result obtained in semiclassical theory.