多光子反Jaynes-Cummings模型中混合态二能级原子的粒子数反转特性

Properties of the population inversion of two-level atomic mixed-state in the multiphoton anti-Jaynes-Cummings model

利用多光子反Jaynes-Cummings模型研究了单模相干光场与混合态二能级原子相互作用时,二能级原子的粒子数反转特性.讨论了相干光场的平均光子数、跃迁光子数以及原子初始态的混合度等参量对粒子数反转的影响.结果表明:二能级原子的粒子数反转有周期性的崩塌和回复现象.相干光场平均光子数和跃迁光子数的增加会改变原子的回复周期和崩塌的衰减时间;随相干光场平均光子数的增加粒子数反转的振荡频率增大;随着混合度的减少回复的周期性和崩塌的衰减时间不发生变化但粒子数反转的振荡幅度增大.

When single mode coherent light field interacts with twoqevel atomic mixed-state, the properties of the atomic population inversion is studied by means of the multi-photon anti-Jaynes-Cummings model. The influence for the parameters of average photon number of the coherent light field, transition photon number and mixing extent of the atomic initial state on the atomic population inversion has been discussed. The results show that the collapse and revival phenomena of periodicity will also appear in the two-level atomic population inversion. With the increasing of the average photon number of the coherent light field and the transition photon number, the revival period and attenuation time of collapse will change. With the increase of the average photon number of the coherent light field, the oscillation frequency of the atomic population inversion increases correspondingly. The revival period and attenuation time of collapse will not change,but the oscillation amplitude of the atomic population inversion will be increase as the decreasing of mixing extent of the atomic initial state.