2021
DOI: 10.3390/app112110474
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Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation

Abstract: In ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization of a modular, analog electronic circuit that enables three-dimensional control of a magnetic field via the amplitude and direction of a current flowing through three perpendicular pairs of coils. Each pair is control… Show more

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Cited by 6 publications
(4 citation statements)
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“…We essentially follow the work of Bruce et al [21] where D 2line gray molasses for 40 K have been implemented for the first time. After the magnetic field of the compressed MOT has been switched off, we set the compensation coil currents to nullify the background magnetic field [22] and detune the repumping and the cooling light to produce a coherent superposition of ground-state hyperfine levels via the excited state F ′ = 9/2. We investigate the dependence of the final atom number and the final temperature on both the single-photon detuning from the F ′ = 9/2 level, ∆ D2 , and on the two-photon detuning δ D2 between the cooling and the repumping light.…”
Section: Sub-doppler Coolingmentioning
confidence: 99%
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“…We essentially follow the work of Bruce et al [21] where D 2line gray molasses for 40 K have been implemented for the first time. After the magnetic field of the compressed MOT has been switched off, we set the compensation coil currents to nullify the background magnetic field [22] and detune the repumping and the cooling light to produce a coherent superposition of ground-state hyperfine levels via the excited state F ′ = 9/2. We investigate the dependence of the final atom number and the final temperature on both the single-photon detuning from the F ′ = 9/2 level, ∆ D2 , and on the two-photon detuning δ D2 between the cooling and the repumping light.…”
Section: Sub-doppler Coolingmentioning
confidence: 99%
“…Gray molasses require good control over the background magnetic field, and it is necessary to cancel all external stray magnetic fields for the best performance. We have nullified stray fields using a method we have developed and illustrated with 39 K [22] which has enabled us to cool that isotope to ∼8 µK. Gray molasses cooling starts immediately after the D 2 -line compressed MOT.…”
Section: Sub-doppler Coolingmentioning
confidence: 99%
“…With their unprecedented precision, optical atomic clocks need many custom-made components to drive experiments correctly. While most existing laboratories have developed their own solutions for operating complex optical clocks, there are few papers that report their electronic circuits in detail [11][12][13][14]. At the same time, autonomously operated optical atomic clocks are becoming more common and in demand for new technology applications [15][16][17] and the new definition of the SI second [18,19].…”
Section: Introductionmentioning
confidence: 99%
“…They are generated either by the flow of current through an arrangement of conductors (called coils) [1][2][3] or by permanent magnets [4,5]. Their role can vary from enabling optical trapping in magnetooptical traps [6], control of interactions with Feshbach resonances [7] and assisting with slowing of atomic velocities in Zeeman slowers [8] to setting a quantization axis and nullifying stray magnetic fields [9].…”
Section: Introductionmentioning
confidence: 99%