激光场与三个两能级原子相互作用

本文研究激光场与原子相互作用时，激光场用相干态描述，原子用自旋态描述，得到了场和原子各自的动力学变化规律。本文研究激光场与三个两能级原子的相互作用。在不同的初始条件下，得到了光子数与原子状态各自随时间的变化关系。光子数很大时，量子理论结果与半径典理论结果是一致的。

THE INTERACTION BETWEEN THE LASER FIELD AND THREE TWO-LEVEL ATOMS

In this paper, we give the quantum theory of the interaction between a single made laser field and atoms. A method utilizing the coherent states variables for the laser field and appropriate spin states variables for two-level atoms is developed. The dynamical evolutions of the field and the atoms are obtained separately. The interaction between the laser field and three two-level atoms are studied. The temporal development of the pboton 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.