arXiv physics/03080542003-08-14physics.atom-phphysics.optics

磁场作用下Rb原子在亚微米气室中的亚多普勒光谱

Sub-Doppler spectroscopy of Rb atoms in a sub-micron vapor cell in the presence of a magnetic field

David Sarkisyan, Aram Papoyan, Tigran Varzhapetyan, Janis Alnis, Kaspars Blush, Marcis Auzinsh

DOI：: 10.1088/1464-4258/6/3/023

摘要：

我们首次报道了利用极薄的蒸气室（厚度~ 400 nm）研究碱金属原子的激光诱导荧光激发光谱的磁场依赖性。这种薄的单元允许亚多普勒分辨率，而没有原子束或激光冷却技术的复杂性。利用该技术研究了Rb在50 G磁场中的激光诱导荧光激发谱。在此场强下，电子角动量J和核子角动量I仅部分解耦。由于不同的超精细状态的波函数的混合，我们观察到一个非线性塞曼效应为每个子级，一个实质性的修改不同的磁性子级之间的跃迁概率，并出现严格禁止的过渡，在没有磁场。对于右旋和左旋圆偏振激光激发的情况，荧光光谱性质不同。观察到明显的磁场诱导圆二色性。这些意见解释了一个标准的方法，描述了部分解耦的I和J状态。

英文摘要：

We report the first use of an extremely thin vapor cell (thickness ~ 400 nm) to study the magnetic-field dependence of laser-induced-fluorescence excitation spectra of alkali atoms. This thin cell allows for sub-Doppler resolution without the complexity of atomic beam or laser cooling techniques. This technique is used to study the laser-induced-fluorescence excitation spectra of Rb in a 50 G magnetic field. At this field strength the electronic angular momentum J and nuclear angular momentum I are only partially decoupled. As a result of the mixing of wavefunctions of different hyperfine states, we observe a nonlinear Zeeman effect for each sublevel, a substantial modification of the transition probabilities between different magnetic sublevels, and the appearance of transitions that are strictly forbidden in the absence of the magnetic field. For the case of right- and left- handed circularly polarized laser excitation, the fluorescence spectra differs qualitatively. Well pronounced magnetic field induced circular dichroism is observed. These observations are explained with a standard approach that describes the partial decoupling of I and J states.

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