文献类型：期刊文献

英文题名：Subluminal and superluminal pulse propagation influenced by strong nonlinear effects

作者：Chang, Zengguang[1];Qi, Yihong[2];Niu, Yueping[2];Zhang, Jingtao[1];Gong, Shangqing[2]

机构：[1]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China;[2]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2012

卷号：45

期号：23

外文期刊名：JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

收录：;EI(收录号：20124915768768);WOS:【SCI-EXPANDED(收录号:WOS:000311432400014)】；

基金：This work was supported by the National Natural Science Foundation of China (grant no. 60978013) and Shanghai Rising-Star Program (grant no. 11QA1407400).

语种：英文

摘要：A scheme is proposed for control of pulse propagation from subluminal to superluminal in a four-level A-type atomic system. With the relatively intense probe laser and the appropriate detuning of control field, the medium exhibits much lower absorption in the spectral ranges where the dispersion changes from normal to abnormal in the double electromagnetically induced transparency system than in the single electromagnetically induced transparency system. The transmission intensity can be enhanced by several times for the subluminal pulse propagation and by several orders of magnitude for the superluminal pulse propagation without the large distortion in the former compared with those in the latter. We attribute the dramatic absorption reduction to the enhanced nonlinear effects.