Atom chip apparatus for experiments with ultracold rubidium and potassium gases

Ivory, Megan; Ziltz, Austin; Fancher, Charles; Pyle, Andrew; Sensharma, Anuraag; Chase, B.; Field, J. P.; García, A.; Jervis, Dylan; Aubin, S.

doi:10.1063/1.4869781

Cited by 10 publications

(5 citation statements)

References 32 publications

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“…1(c). A thermal cloud of 10 5 ultracold 87 Rb atoms in |e is transferred from an atom chip micro-magnetic trap [21] into an optical dipole trap (ODT) located roughly 100 µm below the chip's surface. The ODT consists of two crossed 1064 nm laser beams: a 1.2 W beam directed alongẑ with a 1/e 2 waist radius of 60 µm and a 0.8 W beam alongx (with a smallŷ component) with a waist radius of 120 µm.…”

Section: Experimental Systemmentioning

confidence: 99%

Microwave ac Zeeman force for ultracold atoms

et al. 2018

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We measure the AC Zeeman force on an ultracold gas of 87 Rb due to a microwave magnetic field targeted to the 6.8 GHz hyperfine splitting of these atoms. An atom chip produces a microwave near-field with a strong amplitude gradient, and we observe a force over three times the strength of gravity. Our measurements are consistent with a simple 2-level theory for the AC Zeeman effect and demonstrate its resonant, bipolar, and spin-dependent nature. We observe that the dressed atom eigenstates gradually mix over time and have mapped out this behavior as a function of magnetic field and detuning. We demonstrate the practical spin-selectivity of the force by pushing or pulling a specific spin state while leaving other spin states unmoved.

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Section: Experimental Systemmentioning

confidence: 99%

Microwave ac Zeeman force for ultracold atoms

et al. 2018

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“…We prepare a sample of ultracold 87 Rb atoms using a dual vacuum chamber apparatus. 8 We begin by trapping approximately 10 8 -10 9 87 Rb atoms in a standard magneto-optical trap (MOT). After a brief optical molasses sequence for further cooling, the atoms are optically pumped into the |F = 2, m F = 2⟩ hyperfine state of the 5S 1/2 ground state.…”

Section: Methodsmentioning

confidence: 99%

Potential roughness suppression in a RF AC Zeeman atom chip trap

Miyahira,

Aubin

2024

Quantum Sensing, Imaging, and Precision Metrology II

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Trapping and manipulating ultracold atoms through the use of atom chips offers the ability to engineer complex electromagnetic field geometries in a compact form factor. One of the primary limitations hindering their use is trap potential roughness which arises as a result of defects in the atom chip wires when atoms are brought close to the chip. This roughness can play a limiting role in atom interferometry and strong 1D confinement experiments. We present an initial experimental demonstration of atom chip potential roughness suppression using radio-frequency (RF) AC Zeeman (ACZ) potentials on an atom chip. Using ∼20 MHz RF magnetic near-fields from the chip to target intra-manifold transitions in the 87 Rb ground state, we trap atoms in a spindependent ACZ potential. We compare the axial trapping potential for atoms in comparable 2-wire DC and AC Zeeman traps and show evidence of roughness suppression in the AC trap.

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“…Light-assisted desorption (LIAD) of rubidium is used to load MOTs from uncoated pyrex cells in geometries optimized for that purpose [15,16]. LIAD could in principle introduce a loss rate for our trapped francium atoms by collisions with added Rb atoms, since we have a small amount of residual Rb in our geometry from offline tests of our trap [10].…”

Section: Constraints On Photodesorption and Photoassisted Dimer Formamentioning

confidence: 99%