在混合阱中制备$^{87}$ Rb $|F = 2, m_F = +2\rangle$玻色-爱因斯坦凝聚体的紧凑装置
Compact setup for the production of $^{87}$Rb $|F = 2, m_F = +2\rangle$ Bose-Einstein condensates in a hybrid trap
摘要：
我们提出了一个紧凑的实验装置的玻色-爱因斯坦凝聚的$^{87}$ Rb的$|F = 2, m_F = +2\rangle$状态。通过使用非平衡磁光阱获得预冷却的$^{87}$ Rb原子束，允许受控地将捕获的原子从第一真空室转移到科学室。在这里，原子被转移到一个混合的陷阱，通过重叠的磁四极阱与远失谐的光学陷阱与交叉光束配置，其中强制射频蒸发实现。最后的蒸发导致玻色-爱因斯坦凝聚，然后进行指数降低的光学陷阱深度。详细讨论了光阱光束的控制和稳定系统。该装置在50 s内可靠地产生了$|F = 2, m_F = +2\rangle$态的纯冷凝物，其中包括33 s的科学磁光阱加载和17 s的强制蒸发。
英文摘要：
We present a compact experimental apparatus for Bose-Einstein condensation of $^{87}$Rb in the $|F = 2, m_F = +2\rangle$ 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 $|F = 2, m_F = +2\rangle$ state in 50 s, which include 33 s loading of the science magneto-optical trap and 17 s forced evaporation.
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