Simple method for producing Bose–Einstein condensates of metastable helium using a single-beam optical dipole trap

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Abstract

We demonstrate a simple scheme to reach Bose–Einstein condensation (BEC) of metastable triplet helium atoms using a single-beam optical dipole trap with moderate power of less than 3 W. Our scheme is based on RF-induced evaporative cooling in a quadrupole magnetic trap and transfer to a single-beam optical dipole trap that is located below the magnetic trap center. We transfer 1×106 atoms into the optical dipole trap, with an initial temperature of 14μK, and observe efficient forced evaporative cooling both in a hybrid trap, in which the quadrupole magnetic trap operates just below the levitation gradient, and in the pure optical dipole trap, reaching the onset of BEC with 2×105 atoms and a pure BEC of 5×104 atoms. Our work shows that a single-beam hybrid trap can be applied for a light atom, for which evaporative cooling in the quadrupole magnetic trap is strongly limited by Majorana spin-flips, and the very small levitation gradient limits the axial confinement in the hybrid trap.

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APA

Flores, A. S., Mishra, H. P., Vassen, W., & Knoop, S. (2015). Simple method for producing Bose–Einstein condensates of metastable helium using a single-beam optical dipole trap. Applied Physics B: Lasers and Optics, 121(3), 391–399. https://doi.org/10.1007/s00340-015-6243-5

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