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Comparison of loading double-loop microtraps from a surface MOT and a FORT

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Abstract

Two methods to load a microtrap consisting of two concentric microwire loops of radii 300 and 660 μm carrying oppositely oriented currents are demonstrated. Atoms can be directly loaded into the microtrap from a surface magneto-optical trap or alternatively using a far-off resonance optical dipole trap (FORT) as an intermediate step. About 1 × 105 87Rb atoms can be loaded into the microtrap using either technique although the FORT achieves a lower temperature. The FORT is well suited to loading a linear array of 3 microtraps that are aligned with the propagation direction of the infrared laser. Atoms can be trapped in either the \(5S_{1/2}\;F=1\) or 2 ground state hyperfine level. The position of the microtrapped atom cloud can be precisely adjusted using a bias magnetic field over a distance of 350 to slightly <50 μm from the atom chip surface.

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Acknowledgments

The authors wish to thank the Canadian Natural Science and Engineering Research Council for financial support.

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Authors and Affiliations

  1. Physics Department, York University, Petrie Building, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada

    B. Jian & W. A. van Wijngaarden

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  1. B. Jian
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  2. W. A. van Wijngaarden
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Correspondence to W. A. van Wijngaarden.

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Jian, B., van Wijngaarden, W.A. Comparison of loading double-loop microtraps from a surface MOT and a FORT. Appl. Phys. B 115, 61–67 (2014). https://doi.org/10.1007/s00340-013-5573-4

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  • DOI: https://doi.org/10.1007/s00340-013-5573-4

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