Rabi oscillations in the spatial profiles of superfluorescent pulses from rubidium vapor.
Rabi oscillations in the spatial profiles of superfluorescent pulses from rubidium vapor.
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DOI：
10.1364/oe.25.023826
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发表时间：
2017-10
期刊：
影响因子：
3.8
通讯作者：
K. Kitano;H. Maeda
中科院分区：
文献类型：
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作者：
K. Kitano;H. Maeda
在这项研究中，我们利用超短脉冲激光驱动Rb原子蒸气的5S-5D双光子跃迁，研究了420 nm共振超荧光(YSF)。当泵浦脉冲接近其变换极限(~100ps)或向下啁啾到约200ps时，420 nm的YSF表现为具有环形径向轮廓的低发散光束。尽管这样的光束轮廓对池中Rb的蒸汽压不那么敏感，但它的直径随着泵浦脉冲功率的变化而严格变化。通过数值求解单个Rb原子的含时薛定谔方程，我们很好地再现了我们的实验观察，表明单原子Rabi振荡是420 nm发射的空间光束轮廓的原因。
In this study, we investigate 420-nm yoked superfluorescence (YSF) emitted from the atomic vapor of rubidium (Rb) by driving the Rb 5S - 5D two-photon transition with an ultrashort pulsed laser. When the pump pulse is close to its transform limit (~ 100 fs) or down-chirped up to around 200 fs, the 420-nm YSF appears as a low-divergence beam with a ring-shaped radial profile. Although such a beam profile is less sensitive to the vapor pressure of Rb in a cell, its diameter rigorously varies as a function of the pump-pulse power. By numerically solving a time-dependent Schrödinger equation for a single-Rb atom, we well reproduce our experimental observation, indicating that a single-atom Rabi oscillation is responsible for the spatial beam profile of the 420-nm emission.