Efficient Photoionization-Loading of Trapped Cadmium Ions with Ultrafast Pulses

Details Efficient Photoionization-Loading of Trapped Cadmium Ions with Ultrafast Pulses Efficient Photoionization-Loading of Trapped Cadmium Ions with Ultrafast Pulses

2006-08-04

arxiv.org/abs/quant-ph/0608043v2

Physics

Quantum Physics

11 pages, 12 figures

Scientific paper

Atomic cadmium ions are loaded into radiofrequency ion traps by photoionization of atoms in a cadmium vapor with ultrafast laser pulses. The photoionization is driven through an intermediate atomic resonance with a frequency-quadrupled mode-locked Ti:Sapphire laser that produces pulses of either 100 fsec or 1 psec duration at a central wavelength of 229 nm. The large bandwidth of the pulses photoionizes all velocity classes of the Cd vapor, resulting in high loading efficiencies compared to previous ion trap loading techniques. Measured loading rates are compared with a simple theoretical model, and we conclude that this technique can potentially ionize every atom traversing the laser beam within the trapping volume. This may allow the operation of ion traps with lower levels of background pressures and less trap electrode surface contamination. The technique and laser system reported here should be applicable to loading most laser-cooled ion species.

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