Control of Wave Propagation and Effect of Kerr Nonlinearity on Group Index

作     者：Hazrat Ali Ziauddin Iftikhar Ahmed 

作者机构：Department of Physics University of Malakand Department of Physics COMSATS Institute of Information Technology 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2013年第60卷第7期

页      面：87-92页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0704[理学-天文学] 0702[理学-物理学] 

主　　题：波的传播 Kerr非线性 控制集 原子系统 电磁感应透明 衰减率 拉曼增益 四能级 

摘      要：We use four-level atomic system and control the wave propagation via forbidden decay rate. The Raman gain process becomes dominant on electromagnetically induced transparency (EIT) medium by increasing the forbidden decay rate via increasing the number of atoms [G.S. Agarwal and T.N. Dey, Phys. Rev. A 74 (2005) 043805 and K. Harada, T. Kanbashi, and M. Mitsunaga, Phys. Rev. A 73 (2006) 013803]. The behavior of wave propagation is dramatically changed from normal (subluminal) to anomalous (superluminal) dispersion by increasing the forbidden decay rate. The system can also give a control over the group velocity of the light propagating through the medium via Kerr field.