Photoionisation loading of large Sr+ ion clouds with ultrafast pulses

Abstract

This paper reports on photoionisation loading based on ultrafast pulses of singly-ionised strontium ions in a linear Paul trap. We take advantage of an autoionising resonance of Sr neutral atoms to form Sr+ by two-photon absorption of femtosecond pulses at a wavelength of 431nm. We compare this technique to electron-bombardment ionisation and observe several advantages of photoionisation. It actually allows the loading of a pure Sr+ ion cloud in a low radio-frequency voltage amplitude regime. In these conditions up to 4x10^4 laser-cooled Sr+ ions were trapped.

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• Quantum computing with trapped ions
• Electrodynamically trapped Yb+ ions for quantum information processing
• Laser ablation loading of a surface-electrode ion trap
• An all-optical ion-loading technique for scalable microtrap architectures
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Cited by in corpus (4)

• Structure of the Alkali-metal-atom-Strontium molecular ions: towards photoassociation and formation of cold molecular ions
• Large 2D Coulomb crystals in a radio frequency surface ion trap
• Precision measurement of the branching fractions of the 5p 2 P 1/2 state in 88 Sr + with a single ion in a micro fabricated surface trap
• Isotope shifts of natural Sr+ measured by laser fluorescence in a sympathetically cooled Coulomb crystal