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

Jian, Bin; Wijngaarden, W. A. van

doi:10.1007/s00340-013-5573-4

Cited by 2 publications

(5 citation statements)

References 22 publications

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“…Zeeman sublevel had a temperature of only ± 11 2 μK. The lower temperature achieved using FORT loading was consistent with our previous experiment that used a larger microtrap [15]. It arises because evaporative cooling is facilitated when the FORT laser power is ramped down [23][24][25].…”

supporting

confidence: 87%

“…The apparatus is similar to that described in our previous work and is therefore only briefly discussed here [14,15]. The atom chip was housed in a pyrex cell that was pumped down to a pressure of − 10 10 torr using a combination titanium sublimation and ion pump.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…Next, the microtrap array was turned on over 20 ms by linearly increasing both the atom chip current to 0.5 A and the bias magnetic field B zbias . The FORT laser power was then decreased to zero in 50 ms which was previously found to optimize the number of atoms loaded into the microtrap array [15].…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…Our group recently demonstrated a magnetic microtrap generated by the fields produced by two concentric circular loops carrying oppositely oriented currents [13][14][15]. The current can be adjusted thereby controlling the trap potential which is not possible using a permanent magnetic film.…”

Section: Introductionmentioning

confidence: 99%

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A linear array of 11 double-loop microtraps for ultracold atoms

Jian¹,

Wijngaarden²

2014

J. Phys. B: At. Mol. Opt. Phys.

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A linear array of 11 closely spaced microtraps was demonstrated. Each microtrap was created using the magnetic field generated by two concentric circular wire loops having radii of 60 and 132 μm carrying oppositely oriented currents as well as a bias magnetic field oriented perpendicular to the atom chip surface containing the microwire loops. 87 Rb atoms were initially cooled using either a surface magneto-optical trap (MOT) or a far off resonance optical dipole trap (FORT) created using an infrared laser directed along the microtrap array axis. The microtrap current was turned on and over 12 000 atoms were loaded into each microtrap. The advantage of FORT loading was that the 11 microtraps were about equally populated and the microtrapped atom temperature of 11 μK was one quarter of that obtained using the MOT.

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supporting

confidence: 87%

Section: Apparatus and Proceduresmentioning

confidence: 99%

Section: Apparatus and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A linear array of 11 double-loop microtraps for ultracold atoms

Jian¹,

Wijngaarden²

2014

J. Phys. B: At. Mol. Opt. Phys.

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“…This paper reviews the so called double-loop microtrap consisting of two concentric loops carrying opposite currents [30][31][32]. This trap can be readily daisy chained in series to create a one-or two-dimensional microtrap array.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of ultracold atoms using double-loop microtraps

Wijngaarden

Jian²,

Mouraviev³

2016

Phys. Scr.

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Ultracold atoms created using microtraps are being used in an increasing number of diverse applications. This paper reviews the double-loop microtrap which consists of two concentric circular wire loops carrying oppositely oriented currents. This generates a magnetic field configuration that traps a magnetic dipole in three-dimensions. The position of the trapped atoms relative to the atom chip surface containing the microwire loops, can be precisely controlled by applying different currents in the two loops or alternatively using a so called bias magnetic field oriented perpendicular to the chip surface. Double-loop microtraps can be daisy chained in series to create a one- or two-dimensional microtrap array. Experiments that have demonstrated a double-loop microtrap array are discussed. Future possibilities are presented as to how atoms can be transferred between adjacent microtraps as well as the use of an additional micro sized Ioffe coil to create a trap having a nonzero magnetic field minimum to reduce atom loss by suppressing Majorana transitions.

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

Cited by 2 publications

References 22 publications

A linear array of 11 double-loop microtraps for ultracold atoms

A linear array of 11 double-loop microtraps for ultracold atoms

Manipulation of ultracold atoms using double-loop microtraps

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