Abstract
We report a method for loading 43Ca+ ions selectively in a linear Paul trap using ultraviolet light-emitting-diodes (LEDs) for the second excitation in a two-step photo-ionization process. The difficulty in working with 43Ca+ is its low natural abundance (0.135%). In order to load 43Ca+ selectively, we utilize the isotope shifts for the 4s2 1 S 0–4s4p1 P 1 transition of neutral calcium atoms. We discuss the limitation of the selectivity of the employed photo-ionization scheme and observe spectra from unwanted isotopes as well as that from 43Ca+. Purification of 43Ca+ is performed by adjusting the detuning of the cooling laser frequency and trapping potential. The method of loading and purification can be used in the application of trapped 43Ca+ for an optical frequency standard and for quantum information processing.
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32.80.Fb; 32.80.Pj
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Tanaka, U., Morita, I. & Urabe, S. Selective loading and laser cooling of rare calcium isotope 43Ca+ . Appl. Phys. B 89, 195–200 (2007). https://doi.org/10.1007/s00340-007-2784-6
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DOI: https://doi.org/10.1007/s00340-007-2784-6