Linewidth of electromagnetically induced transparency under motional averaging in a coated vapor cell  

作　　者：徐智翔 曲伟智 高然 胡新华 肖艳红 

机构地区：[1]Department of Physics,State Key Laboratory of Surface Physics,Laboratory of Advanced Materials,and Key Laboratory of Micro and Nano Photonic Structures of Ministry of Education,Fudan University [2]Department of Material Science,Fudan University

出　　处：《Chinese Physics B》2013年第3期289-296,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 61078013 and J1103204);the Shanghai Pujiang Program,China (Grant No. 10PJ1401400);the National Basic Research Program of China (Grant Nos. 2011CB921604 and 2012CB921604);the Fudan University,China

摘　　要：The linewidth of electromagnetically induced transparency（EIT） in a coated Rb vapor cell was studied under a magnetic field gradient.The nonlinear broadening of the EIT linewidth with the magnetic field gradient was observed.It was found that the motional averaging of the field gradient was more pronounced at higher laser intensities and larger beam sizes.In the same regime,there was a small linewidth decrease with the increasing magnetic field gradient.We have established a Monte-Carlo model,which gave results in good qualitative agreement with our experiment.Physics pictures for the above phenomena were also suggested.These results provide an understanding of the EIT linewidth behavior under motional averaging,and should be useful for applications in quantum optics and metrology based on coated vapor cells.The linewidth of electromagnetically induced transparency（EIT） in a coated Rb vapor cell was studied under a magnetic field gradient.The nonlinear broadening of the EIT linewidth with the magnetic field gradient was observed.It was found that the motional averaging of the field gradient was more pronounced at higher laser intensities and larger beam sizes.In the same regime,there was a small linewidth decrease with the increasing magnetic field gradient.We have established a Monte-Carlo model,which gave results in good qualitative agreement with our experiment.Physics pictures for the above phenomena were also suggested.These results provide an understanding of the EIT linewidth behavior under motional averaging,and should be useful for applications in quantum optics and metrology based on coated vapor cells.

关 键 词：electromagnetically induced transparency coated cell LINEWIDTH motional averaging 

分 类 号：O441.3[理学—电磁学]