Macroscopic effects in electromagnetically-induced transparency in a Doppler-broadened system  

作　　者：裴丽娅 牛金艳 王如泉 屈一至 吴令安 傅盘铭 左战春 

机构地区：[1]College of Material Sciences and Optoelectronic Technology,University of the Chinese Academy of Sciences [2]School of Mathematics,Physics and Biological Engineering,Inner Mongolia University of Science and Technology [3]Laboratory of Optical Physics,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2015年第1期275-281,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.10974252,11274376,60978002,and 11179041);the National Basic Research Program of China(Grant No.2010CB922904);the National High Technology Research and Development Program of China(Grant No.2011AA120102);the Natural Science Foundation of Inner Mongolia,China(Grants No.2012MS0101);the Innovation Fund of Inner Mongolia University of Science and Technology,China(Grants No.2010NC064)

摘　　要：We study the electromagnetically-induced transparency（EIT） in a Doppler-broadened cascaded three-level system.We decompose the susceptibility responsible for the EIT resonance into a linear and a nonlinear part, and the EIT resonance reflects mainly the characteristics of the nonlinear susceptibility. It is found that the macroscopic polarization interference effect plays a crucial role in determining the EIT resonance spectrum. To obtain a Doppler-free spectrum there must be polarization interference between atoms of different velocities. A dressed-state model, which analyzes the velocities at which the atoms are in resonance with the dressed states through Doppler frequency shifting, is employed to explain the results.We study the electromagnetically-induced transparency（EIT） in a Doppler-broadened cascaded three-level system.We decompose the susceptibility responsible for the EIT resonance into a linear and a nonlinear part, and the EIT resonance reflects mainly the characteristics of the nonlinear susceptibility. It is found that the macroscopic polarization interference effect plays a crucial role in determining the EIT resonance spectrum. To obtain a Doppler-free spectrum there must be polarization interference between atoms of different velocities. A dressed-state model, which analyzes the velocities at which the atoms are in resonance with the dressed states through Doppler frequency shifting, is employed to explain the results.

关 键 词：electromagnetically-induced transparency polarisation interference Doppler-broadened system 

分 类 号：O441.3[理学—电磁学]