真空场诱导相干对梯形四能级原子系统中单光子和双光子透明的影响  

Effects of Vacuum-Induced Coherence on the Single and Two-Photon Transparency in a Four-Level Ladder Atomic System

作　　者：曾志强[1] 侯邦品[1] 

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610066

出　　处：《光学学报》2010年第1期251-256,共6页Acta Optica Sinica

基　　金：国家自然科学基金(10647007);四川省教育厅重点科研基金(07ZA086);四川省青年基金(09ZQ026008)资助课题

摘　　要：当一个梯形四能级原子系统的中间两个能级分别与真空辐射场相互作用耦合到基态和激发态时,自发衰变路径间的量子干涉效应导致了V和Λ型的真空场诱导相干(VIC)。利用半经典理论,分别讨论了这两种类型的VIC对单光子和双光子电磁诱导透明的影响,并发现Λ型的真空场诱导相干增强双光子的吸收,而对单光子的吸收几乎无影响;V型的真空场诱导相干抑制单光子和双光子的吸收。When the two middle levels in a four-level ladder atom are coupled with a ground and a excited levels by the same vacuum radiation fields,respectively,there are two kinds of vacuum-induced coherence（VIC）：V and Λ-type VIC;due to the quantum interference effects between the spontaneous decay channels.The effects of the VIC on the electromagnetically induced single-and two-photon transparency are studied by the semiclassical theory,respectively.The Λ-type VIC enhances the two-photon absorption,but has no effect on the single photon absorption;the V-type VIC suppresses the single and two-photon absorption.

关 键 词：量子光学 真空场诱导相干 梯形四能级原子系统 电磁诱导透明 

分 类 号：O431.2[机械工程—光学工程]