Ultraslow optical solitons via electromagnetically induced transparency:a density-matrix approach  

作　　者：骆斌 杭超 李慧军 黄国翔 

机构地区：[1]Department of Physics and Information Science,Yulin Teachers College [2]Department of Physics,East China Normal University [3]Department of Physics,Zhejiang Normal University

出　　处：《Chinese Physics B》2010年第5期354-362,共9页中国物理B（英文版）

基　　金：Project supported by National Natural Science Foundation of China (Grant Nos. 10674060,10874043 and 10974181);by the National Basic Research Program of China (Grant Nos. 2005CB724508 and 2006CB921104)

摘　　要：We study the ultraslow optical solitons in a resonant three-level atomic system via electromagnetically induced transparency under a density-matrix （DM） approach. The results of linear and nonlinear optical properties are compared with those obtained by using an amplitude variable （AV） approach. It is found that the results for both approaches are the same in the linear regime if the corresponding relations between the population-coherence decay rates in the DM approach and the energy-level decay rates in the AV approach are appropriately imposed. However, in the nonlinear regime there is a small difference for the self-phase modulation coefficient of the nonlinear SchrSdinger equation that governs the time evolution of probe pulse envelope. All analytical predicts are checked by numerical simulations.We study the ultraslow optical solitons in a resonant three-level atomic system via electromagnetically induced transparency under a density-matrix （DM） approach. The results of linear and nonlinear optical properties are compared with those obtained by using an amplitude variable （AV） approach. It is found that the results for both approaches are the same in the linear regime if the corresponding relations between the population-coherence decay rates in the DM approach and the energy-level decay rates in the AV approach are appropriately imposed. However, in the nonlinear regime there is a small difference for the self-phase modulation coefficient of the nonlinear SchrSdinger equation that governs the time evolution of probe pulse envelope. All analytical predicts are checked by numerical simulations.

关 键 词：ultraslow optical solitons electromagnetically induced transparency 

分 类 号：O437[机械工程—光学工程]