Subluminal and Superluminal Phenomena in a Four-Level Atom

• 来源期刊: 理论物理通讯(英文版)
• 年，卷（期）: 2008,（7）
• 页码范围: 197-200
• 页数: 4页
• 语种: 英文

摘要

In a four-level atomic system,we investigate the light pulse propagation properties interacting with only one laser field.It is shown that in the steady state,the group velocity of the light pulse can be changed from subluminal to superluminal by varying the field detuning.Meanwhile,the effects of the field intensity on the group velocity are also shown.At last,with special parameters,the analytical solution for the group index is also obtained.