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

Isotope shifts of naturalSr+measured by laser fluorescence in a sympathetically cooled Coulomb crystal

“…Trapping, cooling, and laser-locking Sr + ions are loaded in a linear Paul trap from an oven containing a strontium dendrite (Aldrich, 99.9% pure). Neutral atoms are ionized by driving a two-photon transition towards a self-ionizing level [18]. The photo-ionizing laser pulses are issued from a frequency doubled Ti:Sa oscillator (Tsunami, Spectra-Physics) with a central frequency of 695 THz (λ = 431 nm) and a pulse duration of ≃ 100 fs.…”

“…Neutral atoms are ionized by driving a two-photon transition towards a self-ionizing level [18]. The photoionizing laser pulses are issued from a frequency-doubled Ti:sapphire oscillator (Tsunami, Spectra-Physics) with a central frequency of 695 THz (λ = 431 nm) and a pulse duration of 100 fs.…”

Precision measurement of the branching fractions of the5pP1/22state inSrLikforman1, Tugayé2, Guibal3 et al. 2016Phys. Rev. A19180View full textAdd to dashboardCite

“…Neutral atoms are ionized by driving a two-photon transition towards a self-ionizing level [38]. The photo-ionizing laser pulses are issued from a frequency doubled Ti:Sa oscillator (Tsunami, Spectra-Physics) with a central frequency of 695 THz (λ = 431 nm) and a pulse duration of ≃ 100 fs.…”

Structure of the alkali-metal-atom + strontium molecular ions: Towards photoassociation and formation of cold molecular ions

“…The Strontium ion is indeed an attractive system for trapping and laser-cooling experiments (see for instance Refs. [55,56]). Following paper I, the present work is devoted to the theoretical determination of the electronic structure of (A-87 Sr) + ions (where A= 6 Li, 23 Na, 39 K, 85 Rb, 133 Cs) using the method briefly recalled in Section II.…”