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

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Abstract

Two efficient and isotope-selective resonant two-photon ionization techniques for loading barium ions into radio-frequency (RF)-traps are demonstrated. The scheme of using the strong dipole-allowed transition 6s 2  1S0→6s6p  1P1 at λ=553 nm as a first step towards ionization is compared to the established technique of using a weak inter-combination line (6s 2  1S0→5d6p  3D1,λ=413 nm). An increase of two orders of magnitude in the ionization efficiency is found favoring the transition at 553 nm. This technique can be implemented using commercial all-solid-state laser systems and is expected to be advantageous compared to other narrowband photo-ionization schemes of barium in cases where highest efficiency and isotope-selectivity are required.

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Acknowledgements

Financial support is gratefully acknowledged by the Deutsche Forschungsgemeinschaft, the DFG cluster of Excellence: Munich Center for Advanced Photonics, the International Max Planck Research School on Advanced Photon Science (IMPRS-APS) and the EU research project PICC: The Physics of Ion Coulomb Crystals, funded under the European Community’s 7th Framework Programme. The authors would like to thank S. Kahra for his contributions to the barium trapping setup and M. Albert for carefully reading the manuscript. We would also like to thank J. Bayerl, C. Kerzl, and T. Dou for their contributions and the Quantum Optics and Spectroscopy Group in Innsbruck especially R. Blatt and D. Rotter for helpful discussions and insights.

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Authors and Affiliations

  1. Max-Planck-Institut for Quantum Optics, Hans-Kopfermann-Str. 1, 85748, Garching, Germany

    G. Leschhorn & T. Schaetz

  2. Albert-Ludwigs-Universitaet Freiburg, Hermann-Herder-Str. 3a, 79104, Freiburg, Germany

    G. Leschhorn & T. Schaetz

  3. Faculty of Science and Technology, Department of Physics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223, Japan

    T. Hasegawa

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  1. G. Leschhorn
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Correspondence to T. Schaetz.

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Leschhorn, G., Hasegawa, T. & Schaetz, T. Efficient photo-ionization for barium ion trapping using a dipole-allowed resonant two-photon transition. Appl. Phys. B 108, 159–165 (2012). https://doi.org/10.1007/s00340-012-5101-y

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  • DOI: https://doi.org/10.1007/s00340-012-5101-y

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