原子的压缩效应及动力学特性

为了探讨双模光场与物质相互作用过程中原子的动力学行为及压缩效应，作者从二能级原子与光场相互作用的有效哈密顿量出发，推导出原子反转算符的期望值及原子的压缩效应与耦合常数Ｇ之间的关系，最后运用数值计算法及相应的图形进一步加以说明．结果表明：当场模与原子相互作用比较强时，原子压缩效应显著增强，并且原子反转、原子偶极吸收部分及原子偶极色散部分都呈现比较明显的周期性崩坍与复原现象．但当耦合太弱或过强时，崩坍区与回复区消失．可见，选择此模型在很大程度上可减小原子行为引起的量子噪声．

SQUEEZING EFFECTS ATOM AND ITS DYNAMICAL PROPERTIES

In order to study atomic dynamic properties and its squeezing effects during the interaction of two modes field and material,we have derived the relations between coupling constant G and expectation value of the atomic inversion operator and its squeezing effects from the effective Hamilton of interaction between the two level atom and the field.Finally,we explain the phenomena by virtue of numerical method and correspondent pictures.When two modes field and atoms have stronger interaction,the atomic squeezing effects are apparently increased and all of the atomic inversion,the atoms of dipole abosorption and dipole dispersion have apparently taken on the phenomena of collapses and revivals.When the interactions are either too weak or too strong,the phenomena of collapses and revivals will disappear.We conclude that choosing the model can decrease quantum noise caused by atomic action to a great extent.