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

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 t...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2014-04, Vol.115 (1), p.61-67
Main Authors: Jian, B., van Wijngaarden, W. A.
Format: Article
Language:English
Subjects:
Adjustment
Clouds
Dipoles
Engineering
Forts
Ground state
Lasers
Linear arrays
Magnetic fields
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
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Summary: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 × 10 5 87 Rb 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 5 S 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
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-013-5573-4