摘要
该文研究了非旋波近似下级联型三能级原子与单模相干态光场相互作用系统粒子布居几率的时间演化规律;讨论了初始场的平均光子数n(初始场强)、原子-光场的耦合系数λ和光场频率ω对粒子布居几率的影响;比较了在相同的初始场强n下,旋波近似与非旋波近似下粒子布居几率演化曲线的差异.结果表明:非旋波近似下,由于虚光子过程的影响,受激辐射场粒子布居几率的演化曲线出现了"小锯齿状",表现为系统的量子噪声;随着光场频率ω的增大,系统的量子噪声将逐渐减小,直至消失;而随着初始场强n的增大,系统的量子噪声逐渐增大.同时,初始场强n和原子-场的耦合系数λ还影响了受激辐射场粒子布居几率演化的曲线量子崩塌-复苏的周期.
In this paper,the atomic population evolution vs.time in the system of three-level casade atom interacting with a single-mode coherent light field is investigated without rotating wave approximation.The influence of the initial mean photon number n of field,of the atom-field coupling sonstant λ and of the light frequency ω on the atomic population is also discussed.And we compare without rotating wave approximation with rotating wave approximation,and find many differences of the atomic population evolution curves on the identical initial field-strength.It has been shown that because of the influence of the virtual-photon process,the little saw-tooth which represents the quantum noise of the system appear in the evolution curves of thae atomic population of the stimulated radiation field.With the increase of light frequency ω,the quantum noise of the system decreases,and then disappears.And with the increases of the initial field-strength n,the quantum noise of the system increases gradually.Meanwhile,the initial field-strength n and atom-field coupling constant λ influence the oscillation period the quantum collapse-revival of the atomic population evolution curves of stimulated radiation field,too.
出处
《江西师范大学学报（自然科学版）》
CAS
2002年第4期299-305,共7页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
江西省自然科学基金资助项目(961252)
