Hyperfine Paschen–Back regime of potassium D2 line observed by Doppler-free spectroscopy
Hyperfine Paschen–Back regime of potassium D2 line observed by Doppler-free spectroscopy
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无多普勒光谱观察钾 D2 线的超精细 Paschen-Back 形态
DOI：
10.1088/1361-6455/aac735
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
D. Sarkisyan
中科院分区：
文献类型：
--
作者：
A. Sargsyan;E. Klinger;A. Tonoyan;C. Leroy;D. Sarkisyan
为了研究K-D2线在外场中的原子跃迁，首次实现了在350 nm禁带厚度的纳米单元中，由介电窗口和钾原子蒸气形成的界面对激光辐射的选择性反射。在中等B场中，有44个单独的塞曼跃迁，它们随着磁场的增加而减少为两组(一组由σ+形成，另一组由σ−圆偏振光形成)，每组包含八个原子跃迁。这些群中的每一个都包含一个所谓的“引导”跃迁，其特殊性是具有在整个0-10千克磁场范围内恒定的概率(强度)和频移斜率(以兆赫G−1为单位)。在π极化激光辐射的情况下，在八个跃迁中，有两个在B=0时是被禁止的，但它们的几率在磁场的影响下发生了巨大的修改。我们证明了对于B-field>；165G，观察到了一个完全的超精细Paschen-back区域。文中还给出了K~D2谱线在磁场中的其它特性。我们的理论计算和实验结果吻合得很好。首次用高光谱分辨率记录了K-D2谱线的超精细巴氏回归区。
Selective reflection of a laser radiation from an interface formed by a dielectric window and a potassium atomic vapour confined in a nano-cell with 350 nm gap thickness is implemented for the first time to study the atomic transitions of K D2 line in external magnetic fields. In moderate B-fields, there are 44 individual Zeeman transitions which reduce to two groups (one formed by σ+, the other one by σ−circularly-polarised light), each containing eight atomic transitions, as the magnetic field increases. Each of these groups contains one so-called ‘guiding’ transition whose particularities are to have a probability (intensity) as well as a frequency shift slope (in MHz G−1) that are constant in the whole range of 0–10 kG magnetic fields. In the case of π-polarised laser radiation, among eight transitions, two are forbidden at B = 0, yet their probabilities undergo a giant modification under the influence of a magnetic field. We demonstrate that for B-fields > 165 G a complete hyperfine Paschen–Back regime is observed. Other peculiarities of K D2 line behaviour in magnetic field are also presented. We show a very good agreement between theoretical calculations and experiments. The recording of the hyperfine Paschen–Back regime of K D2 line with high spectral resolution is demonstrated for the first time.
DOI：
10.1088/0953-4075/48/19/195004
发表时间：
2015-06
期刊：
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子：
--
作者：
R. Hanley;P. D. Gregory;I. Hughes;S. Cornish
通讯作者：
R. Hanley;P. D. Gregory;I. Hughes;S. Cornish
影响因子：
8.6
作者：
Keaveney, J.;Sargsyan, A.;Adams, C. S.
通讯作者：
Adams, C. S.