Electromagnetically induced transparency based six-wave mixing in a Doppler-broadened folded four-level system  

作　　者：牛金艳 裴丽娅 吴令安 傅盘铭 

机构地区：[1]Laboratory of Optical Physics,Institute of Physics and Center for Condensed Matter,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2010年第11期311-317,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. 10774185,10974252,and 10674174);the National Program for Basic Research in China (Grant No. 2006CB921107)

摘　　要：We study phase-conjugate six-wave mixing spectroscopy based on electromagnetically-induced-transparency in a Doppler-broadened folded four-level system. It is found that the six-wave mixing spectrum can be either Doppler-free or very broad, depending on whether the interference between the polarisations of atoms with different velocities is constructive or destructive. To obtain the Doppler-free six-wave mixing spectrum in the folded four-level system, the conditions are more stringent in comparison with those in the cascade and N-type four-level systems. This polarisation interference can be controlled in the presence of a strong coupling field.We study phase-conjugate six-wave mixing spectroscopy based on electromagnetically-induced-transparency in a Doppler-broadened folded four-level system. It is found that the six-wave mixing spectrum can be either Doppler-free or very broad, depending on whether the interference between the polarisations of atoms with different velocities is constructive or destructive. To obtain the Doppler-free six-wave mixing spectrum in the folded four-level system, the conditions are more stringent in comparison with those in the cascade and N-type four-level systems. This polarisation interference can be controlled in the presence of a strong coupling field.

关 键 词：six-wave mixing electromagnetically induced transparency polarisation interference 

分 类 号：O431.2[机械工程—光学工程] O562[理学—光学]