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Multiphoton Coherence Effects in Double-Inverted Y System
Journal of Russian Laser Research ( IF 0.9 ) Pub Date : 2020-05-30 , DOI: 10.1007/s10946-020-09867-9
M. Karthick Selvan

We investigate the multiphoton coherence effects on two weak probe-beam transitions in a five-level double-inverted Y system, where the two probe transitions are also affected by phase-dependent χ(3) processes occurring via Λ and Ξ channels. This system provides two channels to create each two-photon coherence and three-photon coherence. We show that quantum interference induced by the closed loop structure formed by excited states enhance the effect of two-photon coherence. Conditions on probe and control beam Rabi frequencies are provided to remove this quantum interference effect and achieve a balance between absorption induced by three-photon coherence and gain due to χ(3) processes either via two channels or via one channel. When the control beams forming double-Λ-configuration are out of phase with each other and so are the control beams forming double-Ξ-configuration, the probe beams are shown to undergo correlated absorption mainly due to χ(3) contribution. Also we present absorption profiles of both probe beams for moving atoms to show the multiphoton coherence effects.

中文翻译:

反向Y系统中的多光子相干效应

我们研究了五能级双反转Y系统中两个弱探针束跃迁的多光子相干效应,其中两个探针跃迁也受到通过Λ和Ξ通道发生的相变χ (3)过程的影响。该系统提供了两个通道来创建每个两个光子相干和三个光子相干。我们表明,由激发态形成的闭环结构引起的量子干涉增强了双光子相干效应。提供了探针和控制光束拉比频率的条件,以消除这种量子干涉效应,并在三光子相干引起的吸收与由于χ引起的增益之间取得平衡(3)通过两个通道或一个通道进行处理。当形成双Λ构型的控制光束彼此异相时,当形成双Λ构型的控制光束也异相时,探测光束主要由于χ (3)贡献而表现出相关吸收。此外,我们还展示了两个探针束对移动原子的吸收曲线,以显示多光子相干效应。
更新日期:2020-05-30
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