%0 Journal Article
%T Quantum interference effects on the probe amplification without and with inversion in a four-level system
%A Zhang Bing
%A Xu Wei-Hu
%A Zhang Hui-Fang
%A Gao Jin-Yue
%A <br>张冰
%A 徐卫华
%A 张惠芳
%A 高锦岳
%J 中国物理 B
%D 2004
%I 
%X A four-level system driven by two coherent fields is considered. It is shown that in the presence of an incoherent pump, the probe gain at a short wavelength can be achieved due to the quantum interference. Our density matrix calculation provides the conditions for probe amplification from different origins, including gain without population inversion on any state basis, gain with population inversion on the dressed-state basis, and gain with population inversion on the bare-state basis. Also, by controlling the Rabi frequency of the coupling field a total change from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.
%K quantum interference
%K probe gain
%K inversion
%K non-inversion<br>量子干涉效应
%K 四层原子系统
%K 无反转放大
%K 反转放大
%K 拉比频率
%K 探测增益
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=F33B99DA129C473816242E7388E40C6D&yid=D0E58B75BFD8E51C&vid=FC0714F8D2EB605D&iid=F3090AE9B60B7ED1&sid=72C9FC6259F90AE2&eid=6C6096522A30D0B8&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=39