Light propagation from subluminal to superluminal in a three-level Λ-type system

被引：41

作者：

Sun, H

Guo, H ^{[1
]}

Bai, YF

Han, DG

Fan, SL

Chen, XZ

机构：

[1] Peking Univ, CREAM Grp, Key Lab Quantum Informat & Measurements, Minist Educ,Sch Elect Engn & Comp Sci, Beijing 100871, Peoples R China

[2] S China Normal Univ, CREAM Grp, Lab Light Transmiss Opt, Guangzhou 510631, Peoples R China

来源：

PHYSICS LETTERS A | 2005年 / 335卷 / 01期

基金：

中国国家自然科学基金;

关键词：

superluminal; subluminal; group velocity;

D O I：

10.1016/j.physleta.2004.11.055

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the group velocity of a weak electromagnetic pulse can be manipulated by adjusting the relative phase of the probing and the pumping fields applied to a A-type three-level system, whose two lower states are coupled by an external control magnetic field. Such control field can, in principle, cause the light propagation to be changed from subluminal to superluminal by modulating the relative phase. The same effect can be obtained by varying the intensities of the pumping and the control magnetic fields, but it is different with Agarwal's [Phys. Rev. A 64 (2001) 053809]. The effect of Doppler broadening on the dispersion is also investigated. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：68 / 75

页数：8

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