摘要
运用密度矩阵运动方程,探讨了调频光场作用下二能级原子系统中的原子跃迁过程,并利用布洛赫矢量模型方法对其演化过程中的粒子布居几率振荡现象进行了动态分析.结果表明,调频效应使得系统粒子的布居几率出现了振荡现象.布洛赫矢量的演化过程表明,粒子布居几率的振荡现象反映的是系统粒子数转移、色散和吸收三者之间动态变化的物理过程.
The temporal evolution of atomic transition in a two-state system under the frequency-modulated field and its dynamic evolution are discussed by means of the density matrix equation and the method of Bloch vector model respectively. The results show that the oscillation of population probability appears in time domain under the effects of frequency-modulated pulse. The dynamic evolution of the Bloch vector indicates that the oscillation of population probability reflects the physical converted process among the population transfer, dispersion and absorption in the two-level system.
出处
《宁夏师范学院学报》
2008年第6期22-26,共5页
Journal of Ningxia Normal University
基金
Supported by the scientific and Technologicl Research and Development Program of Ningxia Province(No.[2008]222-1)
the Scientific and Research Project of Colleges and Universities of Ningxia Province(No.[2008]192-81)
the Key Scientific and Research Project of Ningixa Teachers University(ZD08006).
关键词
二能级系统
布居振荡
调频场
Two-level system
Oscillation of population probability
Frequency-modulated field
