Compact strontium atom source using fiber-based pulsed laser ablation
Compact strontium atom source using fiber-based pulsed laser ablation
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DOI：
10.1063/5.0146658
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发表时间：
2023-02
影响因子：
4
通讯作者：
A. Osada;R. Tamaki;W. Lin;I. Nakamura;A. Noguchi
中科院分区：
文献类型：
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作者：
A. Osada;R. Tamaki;W. Lin;I. Nakamura;A. Noguchi
我们设计，演示和表征的锶原子源基于光纤脉冲激光烧蚀。通过使用商业上可获得的微型透镜系统，聚焦纳秒脉冲激光通过105 μm芯的多模光纤传递，我们烧蚀SrTiO 3靶，并产生中性锶原子射流，虽然我们的方法可以应用于其他透明烧蚀目标包含的材料下关注。我们的设备可以承受6000次脉冲传输和照射，而不会对光纤面和透镜造成明显损坏。所产生的锶束的特征在于与光谱方法，并显示出800 K的横向温度和2300 m/s的纵向速度，这是典型的脉冲激光烧蚀为基础的原子源。单次烧蚀脉冲产生的原子数估计为2×105。我们的设备提供了一个紧凑的，低温兼容的尾纤原子源，最大限度地减少设备的足迹和降低真空系统的复杂性，以进一步促进冷原子实验的发展。它也可能在原子和分子科学中找到有趣的应用。
We designed, demonstrated, and characterized a strontium atom source based on fiber-based pulsed laser ablation. By using a commercially available miniature lens system for focusing nanosecond pulsed laser of up to 225 μ J delivered through a multimode fiber of 105 μm core, we ablate a SrTiO3 target and generate a jet of neutral strontium atoms, though our method can be applied to other transparent ablation targets containing materials under concern. Our device endures 6000 cycles of pulse delivery and irradiation without noticeable damage on the fiber facets and lenses. The generated strontium beam is characterized with a spectroscopic method and is revealed to exhibit the transverse temperature of 800 K and a longitudinal velocity of 2300 m/s, which are typical for a pulsed-laser-ablation-based atom source. The number of atoms generated by a single ablation pulse is estimated to be 2×105. Our device provides a compact, cryo-compatible fiber-pigtailed atom source with minimized device footprints and reduced complexity of vacuum systems to further promote development of cold-atom experiments. It may also find interesting applications in atomic and molecular sciences.