Selective Loading of Rare Calcium Isotope <SUP>43</SUP>Ca<SUP>+</SUP> using Photo-Ionization

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  • MORITA Isamu
    Division of Advanced Electronics and Optical Science, Graduate School of Engineering Science, Osaka University
  • TANAKA Utako
    Division of Advanced Electronics and Optical Science, Graduate School of Engineering Science, Osaka University CREST, Japan Science and Technology Agency
  • URABE Shinji
    Division of Advanced Electronics and Optical Science, Graduate School of Engineering Science, Osaka University CREST, Japan Science and Technology Agency

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Other Title
  • 光イオン化による微量同位体<SUP>43</SUP>Ca<SUP>+</SUP>イオンの選別捕獲
  • 光イオン化による微量同位体43Ca[+]イオンの選別捕獲
  • ヒカリ イオンカ ニ ヨル ビリョウ ドウイタイ 43Ca プラス イオン ノ センベツ ホカク

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Description

Rare calcium isotope 43Ca+ ion (0.135%) is the only naturally abundant isotope with hyperfine structure. This isotope is considered an attractive candidate both for an optical frequency standard and for quantum information processing. We report a method to load 43Ca+ ions selectively into a linear Paul trap using a two-step, resonant photo-ionization process. Isotope selectivity is achieved by utilizing the isotope shifts for the resonant 4s2 1S0-4s4p 1P1 transition of neutral calcium. The second non-resonant excitation is achieved by an ultraviolet light emitting diode (LED). The use of an LED is simpler and more economical than using a laser for the second transition. Additionally the laser cooling of 43Ca+ is demonstrated using two ultraviolet-diode lasers and two infrared-diode lasers. Due to the hyperfine structure, the laser requirements for Doppler cooling 43Ca+ are more demanding than for the other isotopes.

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