arXiv quant-ph/01091172001-09quant-ph

单单色Laser场共振荧光的窄谱特征

Narrow Spectral Feature In Resonance Fluorescence With A Single Monochromatic Laser Field

Joerg Evers, Christoph H. Keitel

备注：: 14 pages, 15 figures, extension of the spring model
发表信息：: J. Evers and C. H. Keitel, Phys. Rev. A 65, 033813 (2002)
DOI：: 10.1103/PhysRevA.65.033813

摘要：

本文描述了一个三能级原子系统的共振荧光光谱，其中两个态被一个单色光场耦合。第三能级只通过辐射衰变与两个激光耦合态发生相互作用，其影响被详细研究。对于一个合适的参数选择，该系统在荧光光谱中的激光频率产生一个非常窄的结构，这是不存在于一个二能级原子的光谱。我们发现这些参数范围内的数值分析，并使用结果推导出的额外的窄峰的解析表达式。我们还推导出一个精确的表达式的峰值强度的假设下，一个随机电报模型是适用于系统。这个模型和一个简单的弹簧模型，然后用来描述的物理起源的附加峰。利用这些结果，我们解释了我们的系统，一个三能级系统的V-配置，其中两个跃迁是激光驱动，和最近报道的相关实验之间的联系。

英文摘要：

We describe the resonance fluorescence spectrum of an atomic three-level system where two of the states are coupled by a single monochromatic laser field. The influence of the third energy level, which interacts with the two laser-coupled states only via radiative decays, is studied in detail. For a suitable choice of parameters, this system gives rise to a very narrow structure at the laser frequency in the fluorescence spectrum which is not present in the spectrum of a two-level atom. We find those parameter ranges by a numerical analysis and use the results to derive analytical expressions for the additional narrow peak. We also derive an exact expression for the peak intensity under the assumption that a random telegraph model is applicable to the system. This model and a simple spring model are then used to describe the physical origins of the additional peak. Using these results, we explain the connection between our system, a three-level system in V-configuration where both transitions are laser driven, and a related experiment which was recently reported.

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