含级联型三能级原子Kerr介质腔的腔场谱

用全量子论研究了初始处于最高激发态放置于充满Kerr介质腔中的级联型三能级原子与单模腔场互作用系统的腔场谱。与二能级原子不同,文中讨论的模型中真空场的Rab i劈裂也会受到Kerr非线性的影响。若腔场初始处于Fock态,腔场与Kerr介质耦合较弱时,Kerr效应主要表现在使谱不对称及影响谱峰数目方面,当腔场与Kerr介质耦合较强时时,Kerr效应主要表现在使对应于无介质腔的中心共振峰远离共振频率。若腔场初始为热光场,腔场谱依Kerr效应强弱可为连续谱或分立谱。

Cavity Field Spectrum for System Consisting of Cascade Three-level Atom within Kerr-medium Filled Cavity

A full quantum theory is applied to the investigation of the cavity field spectrum of a system containing the cascade three-level atom,initially in the most excited state,interacting with the single mode of a Kerr-medium filled cavity.The vacuum Rabi splitting of the system is found affected by Kerr nonlinearity,contrary to the two-level atom case.For an initial Fock-state field,the Kerr effects are mainly reflected by the asymmetry of the spectrum and a change in the number of spectral peaks if the coupling between the field and the Kerr medium is weak.The effects are also reflected by receding away from the resonant frequency of the central resonant peak in the absence of the Kerr medium if the field-medium coupling is strong.For an initial thermal field,the cavity spectrum can be a continuous band or discrete lines depending on the strength of the Kerr effect.