arXiv 2104.114812021-04physics.atom-ph

高通量二维激光冷却互组合跃迁冷镱原子束源

High-Flux Cold Ytterbium Atomic Beam Source Using Two-Dimensional Laser Cooling with Intercombination Transition

Toshiyuki Hosoya, Ryotaro Inoue, Tomoya Sato, Mikio Kozuma

备注：: 7 pages, 6 figures
DOI：: 10.1016/j.optcom.2022.129048

摘要：

我们证明了一个高通量和低横向温度的镱原子束应用二维冷却使用${}^1\mathrm{S}_0\text{-}{}^3\mathrm{P}_1$互组合过渡到偶极允许的${}^1\mathrm{S}_0\text{-}{}^1\mathrm{P}_1$过渡产生的冷原子束。对于纵向速度为$30\,\mathrm{m/s}$的原子束，获得了$11 \pm 9\,\mathrm{μK}$的最佳横向温度和$(7.5 \pm 1.0) \times 10^8\,\mathrm{atoms/s}$的原子通量。在纵向速度为$22 - 30\,\mathrm{m/s}$的范围内，横向温度保持在$23\,\mathrm{μK}$以下，而通量高于$6.5 \times 10^8\,\mathrm{atoms/s}$。我们还讨论了利用基态和长寿命亚稳态之间的动量选择性光学跃迁进一步缩小横向动量宽度到小于反冲动量的可行性。我们的原子束的横向动量宽度小于反冲动量的5.7倍，这是所提出的方法的一个很好的起点。

英文摘要：

We demonstrate a high-flux and low transverse temperature atomic beam of ytterbium by applying two-dimensional cooling using the ${}^1\mathrm{S}_0\text{-}{}^3\mathrm{P}_1$ intercombination transition to the cold atomic beam produced by the dipolar-allowed ${}^1\mathrm{S}_0\text{-}{}^1\mathrm{P}_1$ transition. The optimized transverse temperature of $11 \pm 9\,\mathrm{μK}$ and an atomic flux of $(7.5 \pm 1.0) \times 10^8\,\mathrm{atoms/s}$ are obtained for the atomic beam whose longitudinal velocity is $30\,\mathrm{m/s}$. The transverse temperature is maintained below $23\,\mathrm{μK}$, while the flux is above $6.5 \times 10^8\,\mathrm{atoms/s}$ in the longitudinal velocity range of $22 - 30\,\mathrm{m/s}$. We also discuss the feasibility of further narrowing the transverse momentum width to less than the recoil momentum using the momentum-selective optical transition between the ground state and the long-lived metastable state. The transverse momentum width of our atomic beam, which is narrower than 5.7 times the recoil momentum, is a good starting point for the proposed method.

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摘要：

英文摘要：

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