Stand-alone vacuum cell for compact ultracold quantum technologies
Stand-alone vacuum cell for compact ultracold quantum technologies
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DOI：
10.1063/5.0061010
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发表时间：
2021-09-20
影响因子：
4
通讯作者：
Riis, Erling
中科院分区：
文献类型：
--
作者：
Burrow, Oliver S.;Osborn, Paul F.;Riis, Erling
紧凑型真空系统是冷原子技术的关键组件，可促进极其精确的传感应用。在真正的便携式紧凑型真空系统方面已经取得了重要进展；然而，尺寸、重量和功率消耗可能大得令人望而却步，光学访问可能受到限制，并且经常需要主动抽气。在这里，我们提出了一种厘米级的陶瓷真空室，具有氦气不渗透的视窗和集成的衍射光学，使来自单一偏振保持光纤的光能够实现强大的激光冷却。基于真空室的冷原子演示器使用最小的电力，每秒提供10(7)个激光冷却的RB-87原子。在连续涌出Rb气体的情况下，主动抽气产生的平衡压力为10-7mbar，被动抽气稳定在3×10-6mbar，时间常数为17天。一种真空电池，没有RB分配，只有被动抽气，目前已经保持了500多天的类似压力。被动抽气真空寿命为几年，这是从短期氦吞吐量估计的，并有许多可预见的改善。这项技术使超冷量子计量的广泛动员成为可能。
Compact vacuum systems are key enabling components for cold atom technologies, facilitating extremely accurate sensing applications. There has been important progress toward a truly portable compact vacuum system; however, size, weight, and power consumption can be prohibitively large, optical access may be limited, and active pumping is often required. Here, we present a centiliter-scale ceramic vacuum chamber with He-impermeable viewports and an integrated diffractive optic, enabling robust laser cooling with light from a single polarization-maintaining fiber. A cold atom demonstrator based on the vacuum cell delivers 10(7) laser-cooled Rb-87 atoms per second, using minimal electrical power. With continuous Rb gas emission, active pumping yields a 10 - 7 mbar equilibrium pressure, and passive pumping stabilizes to 3 x 10 - 6 mbar with a 17 day time constant. A vacuum cell, with no Rb dispensing and only passive pumping, has currently kept a similar pressure for more than 500 days. The passive-pumping vacuum lifetime is several years, which is estimated from short-term He throughput with many foreseeable improvements. This technology enables wide-ranging mobilization of ultracold quantum metrology.