用于在混合阱中制备（87）Rb |F = 2，m = + 2〉玻色-爱因斯坦凝聚体的紧凑装置。

Compact setup for the production of (87)Rb |F = 2, m = + 2〉 Bose-Einstein condensates in a hybrid trap.

作者信息

Nolli Raffaele, Venturelli Michela, Marmugi Luca, Wickenbrock Arne, Renzoni Ferruccio

机构信息

Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

出版信息

Rev Sci Instrum. 2016 Aug;87(8):083102. doi: 10.1063/1.4960395.

DOI:10.1063/1.4960395

PMID:27587095

Abstract

We present a compact experimental apparatus for Bose-Einstein condensation of (87)Rb in the |F = 2, mF = + 2〉 state. A pre-cooled atomic beam of (87)Rb is obtained by using an unbalanced magneto-optical trap, allowing controlled transfer of trapped atoms from the first vacuum chamber to the science chamber. Here, atoms are transferred to a hybrid trap, as produced by overlapping a magnetic quadrupole trap with a far-detuned optical trap with crossed beam configuration, where forced radiofrequency evaporation is realized. The final evaporation leading to Bose-Einstein condensation is then performed by exponentially lowering the optical trap depth. Control and stabilization systems of the optical trap beams are discussed in detail. The setup reliably produces a pure condensate in the |F = 2, mF = + 2〉 state in 50 s, which includes 33 s loading of the science magneto-optical trap and 17 s forced evaporation.

摘要

我们展示了一种用于实现处于|F = 2, mF = + 2〉态的（87）Rb玻色-爱因斯坦凝聚的紧凑型实验装置。通过使用不平衡磁光阱获得预冷的（87）Rb原子束，从而实现将捕获的原子从第一个真空腔可控地转移到科学腔。在这里，原子被转移到一个混合阱中，该混合阱由具有交叉光束配置的磁四极阱与远失谐光阱重叠产生，在其中实现强迫射频蒸发。然后通过指数降低光阱深度来进行导致玻色-爱因斯坦凝聚的最终蒸发。详细讨论了光阱光束的控制和稳定系统。该装置能在50秒内可靠地产生处于|F = 2, mF = + 2〉态的纯凝聚体，其中包括33秒的科学磁光阱加载时间和17秒的强迫蒸发时间。