Eu^(3+)∶Y_2SiO_5晶体中电磁感应透明及群速度减慢研究  

Investigation on Electromagnetically Induced Transparency and Slowing-Down of Group Velocity in Eu^(3+)∶Y_2SiO_5 Crystal

作　　者：梁卿昌[1] 王海华[2] 蒋占魁[1] 

机构地区：[1]烟台大学光电信息科学技术学院物理系,烟台264005 [2]吉林大学物理学院,长春130023

出　　处：《光学学报》2007年第5期946-950,共5页Acta Optica Sinica

基　　金：国家自然科学基金(10074020)资助课题

摘　　要：利用光与物质相互作用的密度矩阵方程及其数值解研究了Eu3+∶Y2SiO5晶体中一种Λ型的电磁感应透明(EIT)和群速度减慢(SGV),得到了探测场的透射率随着探测场的失谐与耦合场的拉比频率的变化关系。分析了自旋子能级非均匀线宽及光学跃迁非均匀线宽对电磁感应透明和群速度减慢的影响,这两个线宽的增加不同程度地抑制了电磁感应透明。根据浓度与非均匀线宽的关系发现中心透射率不是随着浓度的增加而单调变化,而是存在一个最佳浓度使电磁感应透明的效果更加明显。分析表明对某一耦合场强,光群速度存在一极小值。Electromagnetically induced transparency （EIT） and slowing-down of group velocity （SGV） in Eu^3＋：Y2SiO5 were investigated by using the density matrix equations of the interaction between the light and the matter and their numerical solutions. The relationship of the probe transmissivity with different probe detuning and coupling Rabi frequency was obtained. The influence of inhomogeneous line width on electromagnetically induced transparency and slowing-down of group velocity were analyzed. Electromagnetically induced transparency was restrained when increasing the inhomogeneous line width. The center transmission was not homogeneously change with the increase of ions-doped concentration. There is an optimal concentration which can make the electromagnetically induced transparent remarkable. It is evident that group velocity of the probe has a minimum value for a certain coupling field strength.

关 键 词：量子光学 量子相干效应 电磁感应光透明 群速度减慢 密度矩阵方程 Eu^3+:Y2SiO5 

分 类 号：O431.2[机械工程—光学工程]