Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 108, Issue 1, Pages 159-165Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-012-5101-y
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Funding
- Deutsche Forschungsgemeinschaft
- DFG cluster of Excellence: Munich Center for Advanced Photonics
- International Max Planck Research School on Advanced Photon Science (IMPRS-APS)
- EU research project PICC: The Physics of Ion Coulomb Crystals
- European Community
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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) S-1(0)-> 6s6p P-1(1) at lambda=553 nm as a first step towards ionization is compared to the established technique of using a weak inter-combination line (6s (2) S-1(0)-> 5d6p D-3(1),lambda=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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