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arXiv 1602.07596quant-ph
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四能级原子系统中的光开关和双稳性

Optical switching and bistability in a four-level atomic systems

Pardeep Kumar, Shubhrangshu Dasgupta

发表信息：
Phys. Rev. A 94, 023851 (2016)
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摘要：

研究了四能级原子系统中强激光场非线性吸收的相干控制。例如，在一个四能级梯形系统中，耦合场产生电磁感应透明（EIT），探测场为奥尔特-汤斯双峰，而控制场不存在。当控制场打开时，在共振处出现一个大的吸收峰，我们说明了这种大的吸收是如何导致光开关的。此外，随着探测场强度的增加，由于饱和效应，这种大的吸收会减少，并且出现透明窗口。我们进一步证明了光学双稳的阈值可以通过选择合适的耦合场和控制场来改变。在四能级Y型结构中，在探测场非线性吸收的背景下，强调了控制场对饱和吸收（SA）和反饱和吸收（RSA）的影响。我们在一个简单的原子系统中实现了RSA和SA，只需应用一个控制字段。

英文摘要：

We explore the coherent control of nonlinear absorption of intense laser fields in four-level atomic systems. For instance, in a four-level ladder system, a coupling field creates electromagnetically induced transparency (EIT) with Aulter-Townes doublet for the probe field while the control field is absent. A large absorption peak appears at resonance as the control field is switched on. We show how such a large absorption leads to optical switching. Further, this large absorption gets diminished and a transparency window appears due to the saturation effects as the strength of the probe field is increased. We further demonstrate that the threshold of the optical bistability can be modified by suitable choices of the coupling and the control fields. In a four-level Y-type configuration, the effect of the control field on saturable absorption (SA) and reverse saturable absorption (RSA) is highlighted in the context of nonlinear absorption of the probe field. We achieve RSA and SA in a simple atomic system just by applying a control field.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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