耦合双原子与两个单模腔场的光子数分布和自发辐射特性  

The Photon Number Distribution and the Spontaneous Radiation Coupling with Two Atom-cavity Systems

作　　者：杨金宝[1] 吕树臣[1] 隋欣[1] 

机构地区：[1]哈尔滨师范大学

出　　处：《哈尔滨师范大学自然科学学报》2014年第3期118-122,共5页Natural Science Journal of Harbin Normal University

摘　　要：研究由两个全同的二能级原子分别同时与两个耦合微腔构成的系统,腔场处于弱相干状态,忽略了两个原子之间的相互作用.采用理论推导和数值计算相结合的方法,研究系统的平均光子数和腔场自发辐射光谱的性质.讨论了腔场的衰减率与平均光子数的关系,以及腔场的耦合强度对弱相干场耦合腔系统自发辐射光谱的影响.研究结果表明:当腔场的衰减率增加时,在两个耦合腔场的非相干泵浦率和衰减率共同作用下,腔场的平均光子数减少,并随衰减率的增加而产生了一个真空拉比震荡.当C1腔场的本征频率γ1变大时,发射光谱S(ω)双波峰整体向高频段飘移.另一方面,当C1腔场的耦合强度g1增加时,高频段和低频段的发射峰分别向高频段和低频段移动.In this paper, the system that consists of two identical two - level atoms simultaneously with two coupled single - mode cavity was researched. The cavity field in weak coherent state was considered and the interaction between the two atoms was ignored. Combined the theoretical analysis and numerical computation, the properties of the mean photon number and the spontaneous radiation spectrum are studied. The relationship between the decay rate and the mean photon number of cavity field were discussed, and the influence of the intensity of coupled cavity field to the spontaneous radiation spectrum of the weak coherent coupled cavity field were discussed. The results show that the mean photon number of the cavity was decreased and a vacuum rabi oscillation was observed as the cavity decay rate was increased under the incoherent pumping rate and the decay rate working together on two coupled cavities. When the cavity field intrinsic frequency became large, the emission spectra of double peak integrally drifted towards high frequency. On the other hand, while the coupling strength of the cavity field increased, the emission peak of high frequency moved towards to the high frequency side and low frequency moved towards to the low frequency side.

关 键 词：量子主方程 原子-腔耦合 平均光子数 自发辐射 

分 类 号：O431.2[机械工程—光学工程]