光学-射频双光子耦合作用下的电磁诱导透明和电磁诱导吸收  

Electromagnetically induced absorption and electromagnetically induced transparency in an optical-radio two-photon coupling configuration

作　　者：张连水[1] 李晓莉[1] 王健[1] 杨丽君[1] 冯晓敏[1] 李晓苇[1] 傅广生[1] 

机构地区：[1]河北大学物理科学与技术学院,保定071002

出　　处：《物理学报》2008年第8期4921-4926,共6页Acta Physica Sinica

基　　金：河北省自然科学基金(批准号:A2005000091);河北省教育厅科研计划(批准号:2004103)资助的课题~~

摘　　要：在通常的Λ型三能级系统中,光学耦合场和探测场分别激发两个不同的光学跃迁,探测吸收谱呈现电磁诱导透明(EIT)特性.若将此系统拓展为光学-射频双光子耦合场和探测场共同作用下的准Λ型四能级系统,探测吸收谱呈现电磁诱导吸收(EIA)和EIT两种特性.通过求解系统的密度矩阵方程,分析了EIA和EIT的产生条件,并给出了相应的缀饰态解释.研究结果表明,在准Λ型四能级系统中,光学耦合场对EIA和EIT的形成起决定作用,共振时出现EIA,非共振时出现EIT,而且EIA和EIT的线宽随着光学耦合场拉比频率的增大而增加.Electromagnetically induced transparency（EIT） resonance is obtained in a well-studied lambda three level system where an optical coupling field and a probing field interact with two optical transitions.However,both electromagnetically induced absorption（EIA） and EIT can be obtained in a modified quasi-lambda four level system consisting of an optical-radio two-photon coupling field and a probing field.By solving the density matrix equation of motion,a physical account of EIA and EIT is given in terms of a dressed state picture.It can be seen that the optical coupling field in this quasi-lambda four level system has a crucial effect on the forming of EIA and EIT.An EIA is observed under a resonant optical coupling and it evolves into an EIT when there is a detuning.Furthermore,the width of EIA or EIT increases as the optical coupling Rabi frequency increases.

关 键 词：电磁诱导透明 电磁诱导吸收 射频场 光学耦合场 

分 类 号：O431.2[机械工程—光学工程]