双波场共振泵浦的四能级原子系统

本文运用Dressed原子态方法;把四能级原子与两个激光场和一个探测场的相互作用转化为四能级原子与一个弱探测吸收场的相互作用,然后采用微扰理论求解Dressed原子表象中的密度矩阵方程,得出吸收谱的解析表达式,并详细讨论了吸收谱的各种持性.最后,导出了由外场感应的能级间的电偶极矩表达式,并找出了吸收谱与它的关系.

Four-level atomic system resonantly pumped by double-wave fields

A four-level atomic system interacting with two laser fields and one probe field has been transformed into a four-level Dressed-Atom System interacting with a weak probe absorption field by means of the Dressed-Atom states. By using perturbation theory to solve the density matrix equations in Dressed-Atom representation, the analytic expressions for absorption spectrum are obtained. The properties of absorption spectrum are discussed in detail. Finally, the induced electric dipole moment between the atomic levels and its relation with the absorption spectrum are deduced.