光场及原子-光场耦合的非线性对腔内原子辐射谱的影响  

INFLUENCE OF NONLINEARITIES OF BOTH THE FIELD AND THE INTENSITY-DEPENDENT ATOM-FIELD COUPLING ON THE EMISSION SPECTRUM OF AN ATOM IN A CAVITY

作　　者：冯健[1] 王继锁[1] 高云峰[2] 詹明生[1] 

机构地区：[1]中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室 [2]聊城师范学院光通信研究所,聊城252059

出　　处：《物理学报》2001年第7期1279-1283,共5页Acta Physica Sinica

基　　金：国家自然科学基金!(批准号 :197740 69和 1973 4 0 0 6);山东省自然科学基金! (批准号 :Q99A0 3 )&&

摘　　要：研究了包括任意的光场非线性和原子 光场非线性依赖强度耦合J C(Jaynes Cummings)模型中单原子的辐射谱 ,分析了上述非线性对辐射谱的影响 .结果表明 ,原子的辐射谱强烈地依赖于光场的非线性项R(a+ a)及原子 光场非线性耦合因子f(a+ a)的形式 ,其谱结构与标准J C模型中原子的辐射谱明显不同 .当腔内充满的非线性介质使得f(a+ a) =1 a+ a时 ,对于任意的初始光场态 ,辐射谱总是显示固定的三峰结构 ,而与初始光场态的分布无关 ,这表明具有形如f(a+ a) =1 a+ a耦合因子的非线性介质与初始态光子数分布对辐射谱的影响相互抵消 .用解析方法对上述谱特性进行了分析 .The emission spectrum of a single atom in the nonlinear coupling J-C (Jaynes-Cummings) model including any forms of nonlinearities of loth the field and the intensity-dependent atom-field coupling is studied. The effects of nonlinearities on the spectrum are demonstrated. It is shown that features of the emission spectrum are influenced significantly by the kinds of the field nonlinearity term R(a(+)a) and the intensity-dependent atom-field nonlinear coupling factor f(a(+)a). The structure of the spectrum is quite different from that of the standard J-C model. It is found that when f(a(+)a) = 1/roota(+)a, the emission spectra always show the definite three-peak structure for any initial state of the field,which implies that the effects on the emission spectrum of both the specific intensity-dependent nonlinear medium with f(a(+)a) = 1/roota(+)a and the initial field photon statistics can be counterbalanced. This feature is analyzed with an analytic method.

关 键 词：辐射谱 非线性耦合 光场 单原子 光子数态 

分 类 号：O562.3[理学—原子与分子物理]