依赖强度耦合的简并量子拍三能级原子的偶极压缩效应

Atomic dipole squeezing of the degenerate quantum-beat three-level atom with intensity-dependent coupling

原子偶极压缩是原子与光场相互作用的一种重要现象,但迄今很少见到依赖强度耦合的三能级原子偶极压缩效应的讨论。采用全量子论方法研究了与单模相干光场相互作用的依赖强度耦合的简并量子拍三能级原子的偶极压缩时间演化特性,讨论了原子下能级裂距、光场强度及初原子态相干性对原子偶极压缩的影响。结果表明,当原子两下能级简并时,原子偶极参量随时间周期性演化,原子两下能级裂距破坏这种周期性并降低压缩量。原子偶极压缩量与初始相干光场强度之间关系不是单调的。原子相干性对原子偶极压缩效应有重要影响。

The atomic dipole squeezing is between an atom and an optical field, but a very important phenomenon in the interaction the atomic dipole squeezing of a three-level atom with an intensity-dependent coupling is seldom reported. By using a full quantum theory, We investigate the time-evolution properties of the atomic dipole squeezing of the degenerate quantum-beat three-level atom intensity-dependently interacting with a single-mode coherent field, and explore effects of splitting of the lower energy levels of the atom, the field intensity and the initial atomic coherence on the atomic dipole squeezing. Our results show that, when the two lower levels of the atom is degenerate, with time, and the splitting of the lower levels dipole squeezing parameters evolve periodically destroy this periodicity and reduce the amount of dipole squeezing. The relationship between the amount of dipole squeezing and the initial coherent field intensity is not monotonous. The initial atomic coherence has a great influence on the dipole squeezing.