Four-level N -scheme crossover resonances in Rb saturation spectroscopy in magnetic fields
Four-level N -scheme crossover resonances in Rb saturation spectroscopy in magnetic fields
复制标题
磁场中 Rb 饱和光谱的四能级 N 型交叉共振
DOI：
10.1103/physreva.92.063810
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发表时间：
2015
影响因子：
2.9
通讯作者：
E. Arimondo
中科院分区：
文献类型：
--
作者：
S. Scotto;D. Ciampini;C. Rizzo;E. Arimondo
我们对浸没在 0.05-0.13 T 范围内的磁场中的室温铷原子在 D$_2$ 线上进行了饱和吸收光谱。在这些中高场值下，激发态的超精细结构被塞曼效应破坏，而在基态超精细结构和塞曼位移是相当的。观察到的光谱由大量吸收线组成。我们将它们识别为两能级系统、V 配置中的三能级系统以及 N 或双 N 配置中的四能级系统上的饱和吸收，其中不共享公共能级的两个光学跃迁通过自发发射衰减耦合。我们在一个统一的简单理论模型中分析所有这些转变的强度。我们将注意力集中在双N交叉信号上，由于四个能级的分支比的对称性，其强度非常大。我们指出，这些结构存在于中高磁场下的所有碱金属原子中，对于电磁感应透明和慢光应用具有有趣的特性。
We perform saturated absorption spectroscopy on the D$_2$ line for room temperature rubidium atoms immersed in magnetic fields within the 0.05-0.13 T range. At those medium-high field values the hyperfine structure in the excited state is broken by the Zeeman effect, while in the ground state hyperfine structure and Zeeman shifts are comparable. The observed spectra are composed by a large number of absorption lines. We identify them as saturated absorptions on two-level systems, on three-level systems in a V configuration and on four-level systems in a N or double-N configuration where two optical transitions not sharing a common level are coupled by spontaneous emission decays. We analyze the intensity of all those transitions within a unified simple theoretical model. We concentrate our attention on the double-N crossovers signals whose intensity is very large because of the symmetry in the branching ratios of the four levels. We point out that these structures, present in all alkali atoms at medium-high magnetic fields, have interesting properties for electromagnetically induced transparency and slow light applications.