腔内单Lambda型三能级原子的电磁诱导透明

	腔内单Lambda型三能级原子的电磁诱导透明
Alternative Title	Electromagnetically induced transparency of a single Lambda type three-level atom in cavity
	孙燕芬
Thesis Advisor	谭磊
	2011-05-27
Degree Grantor	兰州大学
Place of Conferral	兰州
Degree Name	硕士
Keyword	电磁诱导透明单原子反射谱三窗口
Abstract	原子相干与量子干涉效应是激光物理和量子光学领域的重要前沿研究课题之一。电磁诱导透明是利用原子相干与量子干涉效应消去介质对光的吸收的现象。这些现象在慢光、弱光强下的非线性、四波混频、量子信息中的光存储和释放等过程中有着重要的作用。本文主要通过主方程的方法分析了腔内单原子的电磁诱导透明的特性。原子—腔系统处于在开放的环境中，所以我们不能忽略环境对系统的影响。因此，我们考虑了腔的耗散和原子的自发辐射对EIT的影响。原子极化的实部和虚部与探测场失谐量的变化曲线就得到了耦合场和探测场共同作用下的 Lambda 型三能级系统相应的稳态反射谱和色散谱。我们的结果显示当泵浦场强度较大时，腔EIT产生了三个透明窗口。可能是由于多余的泵浦作用于原子上，使原子的上能级发生劈裂。进一步，我们发现窗口的频率能被耦合场的失谐量调谐。另外，反射曲线对腔场的失谐非常的敏感，当逐渐改变腔场的失谐时，出现了增益效应。在本文的最后，对我们的工作作了总结，并对将来的研究作了展望。
Other Abstract	Atomic coherence and quantum interference is one of the most important research subjects in the field of laser physics and quantum optics. Electromagnetically induced transparency makes an otherwise opaque medium almost transparent. These phenomena display attractively academic and applied values in many fields such as slow light, nonlinearity at low light level, four-wave mixing, light storing and retrieving in quantum information processing. In this paper, we investigate EIT with single atom in an optical cavity using master equation method. Atom-cavity system was placed in the open environment, the interaction of the system with the environment cannot be neglected. Therefore, we consider the dissipative processes of the system, which include the leakage of photons from the cavity and spontaneous emission from the atom. the reflection of the photons in the cavity and is correspond to the imaginary part of polarizability of the atom. Our result show that three transparency windows appears in cavity EIT when η is big enough. It can be found that three windows were determined by pump strength η. Furthermore, it is shown that the frequency of EIT windows can be tuned by changing the coupling field detuning and the reflection profile is very sensitive to the cavity field detuning. Its behavior is similar to the gain of absorption by changing. We summary this thesis in the last chapter and outlook researches in the future.
URL	查看原文
Language	中文
Document Type	学位论文
Identifier	https://ir.lzu.edu.cn/handle/262010/229483
Collection	物理科学与技术学院
Recommended Citation GB/T 7714	孙燕芬. 腔内单Lambda型三能级原子的电磁诱导透明[D]. 兰州. 兰州大学,2011.

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