Open AccessResonant gain suppression and superluminal group velocity in a multilevel system
Author(s) -
Cui-Li Cui,
Chang-Bao Fu,
Hong Yang,
Qiyu Bao,
Huailiang Xu,
Jin-Hui Wu
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.010712
Subject(s) - superluminal motion , group velocity , atomic system , physics , electromagnetically induced transparency , optics , laser , interference (communication) , atomic physics , quantum mechanics , telecommunications , channel (broadcasting) , computer science
We investigate the interaction of an open (N + 1)-level extended V-type atomic system (i.e. a closed (N + 2)-level atomic system) with N coherent laser fields and one incoherent pumping field through both analytical and numerical calculations. Our results show that the system can exhibit multiple resonant gain suppressions via perfect quantum destructive interference, which is usually believed to be absent in closed three-level V system and its extended versions involving more atomic levels, with at most N - 1 transparency windows associated with very steep anomalous dispersions occurring in the system. The superluminal group velocity of the probe-laser pulse with at most N - 1 negative values can also be generated and controlled with little gain or absorption.