Compact setup for the production of ${}^{87}$Rb $|F=2,m_F=+2⟩$ Bose-Einstein condensates in a hybrid trap

Abstract

We present a compact experimental apparatus for Bose-Einstein condensation of ${}^{87}$Rb in the $|F=2,m_F=+2⟩$ 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 $|F=2,m_F=+2⟩$ state in 50 s, which include 33 s loading of the science magneto-optical trap and 17 s forced evaporation.

arXiv comment8 pages, 8 figures. Published version can be found at http://dx.doi.org/10.1063/1.4960395

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