强圆极化地三能级原子寿命的影响

在薛定谔方程中引入能级衰减项,并通过对圆极化光调频及强激光近似,对三种类型的三能级原子分别找到了三个特殊态,基于对特殊态的研究,讨论了圆极化光对三能级原子寿命的影响。     

压缩真空中的三能级原子的自发辐射

对压缩真空与Ｖ型三能级原子的相互作用作了理论分析,探讨了量子干涉效应对压缩真空中原子自发辐射的影响。当原子的上能级简并时强的量子干涉效应影响原子的定态和定态出射光谱,使它们对原子的初态敏感。这种情况下,压缩使谱线趋于关于压缩真空中心频率对称,量子干涉使谱线趋于不对称。     

光泵三能级原子体系产生光子数压缩态

本文证明光泵三能级原子体系可以产生光子数压缩态。分别计算非相干泵浦、弱相干泵浦和强相于泵浦几种情形下的Fano因数。结果表明,弱相干泵浦时可获得最佳压缩效应,相应的Fano因数为0.16。这种产生光子数压缩态的方法在实验上是简便可行的。 关键词：     

三维光子晶体中三能级原子的自发发射

研究了三维光子晶体中三能级原子自发发射的性质.由于各向异性色散关系,能带带边的态密度没有奇异性,局域场可以消失.在一定条件下弥散场会得到加强,并在辐射场中占主导地位.这些性质将与原子能级和能带带边的相对位置有关,且有别于各向同性色散关系的光子晶体中原子自发发射的性质. 关键词： 光子晶体 三能级原子 自发发射     

光子晶体中三能级原子的自发发射

讨论了三能级原子在光子晶体中的自发发射问题.由于量子干涉和光的局域化,两个上能级中的粒子数布居将具有周期振荡或准周期振荡,这不仅依赖于两个上能级与禁带的相对位置, 同时也依赖于原子的初始状态,且有别于真空中三能级原子的自发发射性质. 关键词：     

压缩真空态中三能级原子的定态共振荧光

本文得到了与压缩白噪声真空库耦合的三能级原子在强相干驱动场作用下的定态共振荧光谱。结果表明谱分布强烈地依赖于库场压缩性及相干驱动场与库场压缩分量之间的位相差。 关键词：     

驱动场作用下光子晶体中三能级原子的自发发射

讨论了在双光子驱动场作用下,三能级原子在光子晶体中的自发发射问题．由于量子干涉和光的局域化作用,两个上能级中的占据数将具有周期振荡或准周期振荡的性质,这不仅依赖于两个上能级与禁带的相对位置,同时也依赖于原子的初始状态,而且还与驱动场的强度、驱动场的入射位相有关．这些性质既与真空中带有驱动场的原子的自发发射性质不同,也有别于无驱动场作用下光子晶体中三能级原子的自发发射性质． 关键词：     

超短光脉冲作用下的二能级原子

考虑到光场的振幅随时间分布的影响时,我们重新研究了光场与二能级原子相互作用的跃迁几率问题。在强光信号作用下,经过一定的数学代换后,上能级几率的求解可归结为类希尔方程求解;在弱光信号作用下,利用转动波近似(RWA),给出了二能级原子跃迁几率的解析表达式,并讨论了几种典型脉冲光场的分布。     

∧—型三能级单原子的辐射谱

采用时间演化算符方法，研究腔内单模光场中∧－型三能级单原子的辐射谱，给出了辐射谱一般公式，并讨论在粒子数纯态、相干态和热辐射三种光场激励下的辐射频谱结构。     

高QKerr介质腔中对相干态场与Λ型三能级原子相互作用过程中光…

本文研究了一个位于高ＱＫｅｒｒ介质腔中的Λ型三能级原子与对相干态场相互作用系统中，Ｋｅｒｒ效应对光单模平均光子数，单模二阶相干性，以及Ｃａｕｃｈｙ－Ｓｃｈｗａｒｔｚ不等式的影响。     

Photo-Ionization of Hydrogen Atom in a Circularly Polarized Standing Electromagnetic Wave

Applying time-independent non-perturbative formalism to thephoto-ionization of hydrogen atom immersed in a strong circularlypolarized standing electromagnetic wave, we calculate the shift ofenergy levels and the distortion of wave functions for thehydrogen atom, the ionization cross section induced by thestanding wave, and the angular distribution of photoelectrons andobtain some interesting results.     

圆极化光场中阻尼V—型原子的斯塔克效应

在对圆极化光调谐及一些近似处理的基础上,圆极化光场中阻尼V－型三能级原子分为6个能级,并针对强场的弱场两种情形,导出了原子能级与能级衰减系数的具体表达式。     

Ponderomotive Force Effects due to a Circularly Polarized Electromagnetic Wave

The modifications in the time-averaged plasma particle distribution functions in the presence of a large amplitude electromagnetic wave are studied. It is shown that the ponderomotive force is responsible for tail formation, non-zero particle currents and heat fluxes. Explicit results, which describe those effects, are derived.     

Inversion of an Atomic Wave Packet in a Circularly Polarized Electromagnetic Wave

We study behavior of an atomic wave packet in a circularly polarized electromagnetic wave,and particularly calculate the atomic inversion of the wave packet.A general method of calculation is presented.The results are interesting.For example,if the wave packet is very narrow or /and the interaction is very strong,no matter the atom is initially in its ground state or excited state,the atomic inversion approaches zero as time approaches infinity.If the atom is initially in its ground state and excited state with the probability 1/2 respectively,and if the momentum density is an even function,then the atomic inversion equals zero at any time.     

Ionization Problem for Hydrogen Atom in Intense Circularly Polarized Laser Field Revisited

Ionization rate for circular polarization laser field is reformulated in length gauge. The Volkov state or the Coulomb-correctsd Volkov one is served at the final wavefunction and would lead to that the ionization rate in length gauge is closer to the experimental data than the corresponding result in velocity gauge. It is also found that the ionization rate as a function of laser intensity has nevertheless the stabilization effect, although in the sense more weakly in length gauge than in velocity gauge, when the field is to be comparable or exceeds to the atomic binding field.     

Entanglement Dynamics of a Three-Level Atom in Ξ Configuration

Dynamical behaviour of entanglement between the cavity mode and a three-level atom in the configuration is studied by making use of log-negativity. The influence of initial temperature of the thermal field and detuning on the entanglement is investigated. It is found that the maximal values of entanglement decreases with the temperature of the thermal field and can be controlled by the defaming.     

Teleportation of a Superposition-Coherent State via a Three-Level Atom

We proposed a scheme for teleportation of an unknown superposition of two coherent-state with equal amplitudes but opposite phases by means of a degenerate V-type three-level atom with cavity-field. This scheme can be realized experimentally based on cavity QED techniques presently.     

Λ-型三能级单原子的辐射谱

采用时间演化算符方法，研究腔内单模光场中Λ－型三能级单原子的辐射谱，给出了辐射谱一般公式，并讨论在粒子数纯态、相干态和热辐射三种光场激励下的辐射频谱结构。     

强光场驱动下内腔三能级原子的共振荧光谱

讨论了强相干激光场驱动下的内腔三能级原子的共振荧光谱，与自由空间情况相比，内腔谱从共振峰为中心向内压缩或向外扩张，但谱线的线型，线宽和强度没有变化，共振峰的线型取决于原子与驱动场之间的失谐程度，文中还谱线特征的形成原因作了分析。