Stability and Group Index Switching in a Four-Level Atomic System

A four-level atomic system is proposed for stability and group index switching in the presence of spontaneously generated coherence. It is found that the transition from optical bistability （OB） to optical multistability （OM） and subluminal to superluminal can be obtained simultaneously. It is shown...

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Bibliographic Details
Published in:Chinese physics letters 2014-08, Vol.31 (8), p.63-66
Main Authors: Hossein, Jafarzadeh, Elnaz, Ahmadi Sangachin, Hossein, Asadpour Seyyed
Format: Article
Language:English
Subjects:
Coherence
Group dynamics
Optical bistability
Stability
Switching
亚光速
光学双稳态
切换
原子系统
四能级
相对相位
稳定性
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Summary:A four-level atomic system is proposed for stability and group index switching in the presence of spontaneously generated coherence. It is found that the transition from optical bistability （OB） to optical multistability （OM） and subluminal to superluminal can be obtained simultaneously. It is shown that the relative phase between applied fields can affect the stability and group index behaviors of weak probe light in the medium. Our proposed model provides a new scheme for simultaneous switching from OB to OM and （sub-to-super） luminal light propagation in an atomic system.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/31/8/084201