Resonant gain suppression and superluminal group velocity in a multilevel system

Cui-Li Cui, Chang-Bao Fu, Hong Yang, Qian-Qian Bao, Huai-Liang Xu, Jin-Hui Wu
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 ... [Opt. Express 20, 10712-10720 (2012)]


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