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Selective loading and laser cooling of rare calcium isotope 43Ca+

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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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Authors and Affiliations

  1. Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan

    U. Tanaka, I. Morita & S. Urabe

  2. JST-CREST, 4-1-8, Hon-cho Kawaguchi, Saitama, 332-0012, Japan

    U. Tanaka & S. Urabe

Authors
  1. U. Tanaka
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  2. I. Morita
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  3. S. Urabe
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Correspondence to U. Tanaka.

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PACS

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

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