Efficient photo-ionization for barium ion trapping using a dipole-allowed resonant two-photon transition

Leschhorn, Günther; Hasegawa, Tsunemi; Schaetz, Tobias

doi:10.1007/s00340-012-5101-y

Cited by 28 publications

(19 citation statements)

References 42 publications

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“…The rf electrodes feature slits symmetrically opposed to the gaps between the segments in the dc electrodes. atoms (and other isotopes) are emitted from an oven, photoionized with a resonant 553-nm and an additional 405-nm laser [ 42 ], and subsequently Doppler cooled to below one millikelvin using lasers at 493 nm and 650 nm for cooling and repumping, respectively. The fluorescence emitted by during Doppler cooling is imaged by a charge-coupled device (CCD) camera used for detection.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

Mass-selective removal of ions from Paul traps using parametric excitation

et al. 2020

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We study a method for mass-selective removal of ions from a Paul trap by parametric excitation. This can be achieved by applying an oscillating electric quadrupole field at twice the secular frequency $$\omega _{\text {sec}}$$ ω sec using pairs of opposing electrodes. While excitation near the resonance with the secular frequency $$\omega _{\text {sec}}$$ ω sec only leads to a linear increase of the amplitude with excitation duration, parametric excitation near $$2\, \omega _{\text {sec}}$$ 2 ω sec results in an exponential increase of the amplitude. This enables efficient removal of ions from the trap with modest excitation voltages and narrow bandwidth, therefore, substantially reducing the disturbance of ions with other charge-to-mass ratios. We numerically study and compare the mass selectivity of the two methods. In addition, we experimentally show that the barium isotopes with 136 and 137 nucleons can be removed from small ion crystals and ejected out of the trap while keeping $$^{138}\text {Ba}^{+}$$ 138 Ba + ions Doppler cooled, corresponding to a mass selectivity of better than $$\Delta m / m = 1/138$$ Δ m / m = 1 / 138 . This method can be widely applied to ion trapping experiments without major modifications since it only requires modulating the potential of the ion trap.

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Section: Comparison With Experimental Resultsmentioning

confidence: 99%

Mass-selective removal of ions from Paul traps using parametric excitation

et al. 2020

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“…Regarding the Paul trap, for instance, any deviation of the blade electrodes from the ideal case causes the presence of a nonzero RF field along the axial direction. The approximate solution to the equation of motion for a particle with mass m and charge +e 0 in a Paul trap in presence of an additional DC field can be written as [34] x i (t) ≈ x 0,i + x 1,i cos(ω i t + ϕ i ) 1 + q i 2 cos(ω RF t) with i = x, y, z where x 1,i is the equilibrium position of the ion along the i-th direction, x 0,i is the position shift from x 1,i due to stray electric field, ω RF is the RF frequency, and ω i is the secular motion frequency. Consequently, the micromotion amplitude along the i-th direction can be estimated as (x 0,i q i )/2.…”

Section: Residual Axial Radiofrequencymentioning

confidence: 99%

Electro-Optical Ion Trap for Experiments with Atom-Ion Quantum Hybrid Systems

2020

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In the development of atomic, molecular and optical (AMO) physics, atom-ion hybrid systems are characterized by the presence of a new tool in the experimental AMO toolbox: atom-ion interactions. One of the main limitations in state-of-the-art atom-ion experiments is represented by the micromotion component of the ions' dynamics in a Paul trap, as the presence of micromotion in atom-ion collisions results in a heating mechanism that prevents atom-ion mixtures from undergoing a coherent evolution.Here we report the design and the simulation of a novel ion trapping setup especially conceived for the integration with an ultracold atoms experiment. The ion confinement is realized by using an electro-optical trap based on the combination of an optical and an electrostatic field, so that no micromotion component will be present in the ions' dynamics. The confining optical field is generated by a deep optical lattice created at the crossing of a bow-tie cavity, while a static electric quadrupole ensures the ions' confinement in the plane orthogonal to the optical lattice. The setup is also equipped with a Paul trap for cooling the ions produced by photoionization of a hot atomic beam, and the design of the two ion traps facilitates the swapping of the ions from the Paul trap to the electro-optical trap.

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“…Measurements of ion loading rates are typically performed in relatively deep traps capable of stably trapping many ions [20,24,34,35]. This allows one to measure the rate of increase of the total fluorescence from the trap as multiple ions are loaded in order to extract the loading rate.…”

Section: B Measurement Of Ion Loading Probability and Ratementioning

confidence: 99%

Loading of a surface-electrode ion trap from a remote, precooled source

2012

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We demonstrate loading of ions into a surface-electrode trap (SET) from a remote, laser-cooled source of neutral atoms. We first cool and load $\sim$ $10^6$ neutral $^{88}$Sr atoms into a magneto-optical trap from an oven that has no line of sight with the SET. The cold atoms are then pushed with a resonant laser into the trap region where they are subsequently photoionized and trapped in an SET operated at a cryogenic temperature of 4.6 K. We present studies of the loading process and show that our technique achieves ion loading into a shallow (15 meV depth) trap at rates as high as 125 ions/s while drastically reducing the amount of metal deposition on the trap surface as compared with direct loading from a hot vapor. Furthermore, we note that due to multiple stages of isotopic filtering in our loading process, this technique has the potential for enhanced isotopic selectivity over other loading methods. Rapid loading from a clean, isotopically pure, and precooled source may enable scalable quantum information processing with trapped ions in large, low-depth surface trap arrays that are not amenable to loading from a hot atomic beam

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Efficient photo-ionization for barium ion trapping using a dipole-allowed resonant two-photon transition

Cited by 28 publications

References 42 publications

Mass-selective removal of ions from Paul traps using parametric excitation

Mass-selective removal of ions from Paul traps using parametric excitation

Electro-Optical Ion Trap for Experiments with Atom-Ion Quantum Hybrid Systems

Loading of a surface-electrode ion trap from a remote, precooled source

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