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理论物理通讯：英文版

Effects of Vacuum-Induced Coherence on One- and Two-Photon Absorption Spectra of Transient Process in a Y-Type System

Zheng, An-Shou, Li, Jiahua, Zhan Zhan, Zhiming, Liu, Ji-Bing

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

我们在一个上调查导致真空的连贯的影响 -- 在一个四水平的 Y 类型原子系统的短暂进程的 andtwo 光子吸收。我们发现一个光子和二光子的短暂吸收和扩大性质对导致 thevacuum 的连贯相当敏感。一个光子和短暂过程的二光子的吸收系列能被 modulating 戏剧性地影响，这也被显示出应用领域的相对阶段。由适当地选择相对阶段，探查地的扩大能被完成。

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我们在一个上调查导致真空的连贯的影响 -- 在一个四水平的 Y 类型原子系统的短暂进程的 andtwo 光子吸收。我们发现一个光子和二光子的短暂吸收和扩大性质对导致 thevacuum 的连贯相当敏感。一个光子和短暂过程的二光子的吸收系列能被 modulating 戏剧性地影响，这也被显示出应用领域的相对阶段。由适当地选择相对阶段，探查地的扩大能被完成。
We investigate the influence of the vacuum-induced coherence on one- and two-photon absorption of the transient process in a four-level Y-type atomic system. We find that the one- and two-photon transient absorption and amplification properties are quite sensitive to the vacuum-induced coherence. It is also shown that the one- and two-photon absorption spectra of the transient process can be dramatically affected by modulating the relative phase of the applied fields. By appropriately choosing the relative phase, the amplification of the probe field can be achieved.
When a four-level Y\mathsf{Y}Y-type atom with two highest nearly degenerate lying levels interacts with the same vacuum radiation field, its excited levels have vacuum-induced coherence due to the quantum interference between the spontaneous decay channels. We consider the effects of the vacuum-induced coherence on the electromagnetically induced transparency against single- and two-photon absorption in the atomic system. We find that the vacuum-induced coherence can lead to probe gain without incoherent pumping. On the other hand, the coherence can suppress the two-photon transparency, even in some cases where it can enhance the two-photon absorption. Another important result is the finding of the crucial role played by the relative phase between the probe and coupling fields: the two-photon transparency and the probe gain spectra can be modulated by this phase.
This paper theoretically studies the effects of the vacuum-induced coherence on one- and two-photon absorption in a four-level atomic medium. It finds that the one- and two-photon absorption and amplification properties are quite sensitive to the vacuum-induced coherence. It is also shown that the one- and two-photon absorption spectra can be dramatically affected by modulating the relative phase of the applied fields. With the proper choice of the relative phase, the amplification without inversion for the probe field can be realized.