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Laser cooling of a small number of Be+ ions in a penning trap

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Abstract

Be+ ions stored in a Penning trap were cooled by a laser beam perpendicular to the magnetic field. The cooled ions are strongly coupled and phase transitions of up to 100 ions were observed. In experiments with only a few ions stored in the trap, a stepwise decrease in fluorescence intensity was observed. All steps are of the same size and so every step is attributed to a single ion. The discrete changes in fluorescence occurred more frequently when the background pressure was increased, caused by collisions between stored ions and background neutral molecules.

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Authors and Affiliations

  1. Communications Research Laboratory, Kansai Advanced Research Center, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe-shi, 651-24, Hyogo, Japan

    H. Imajo, S. Urabe, K. Hayasaka & M. Watanabe

  2. Faculty of Engineering, Kagoshima University, Kohrimoto, Kagoshima-shi, 890, Kagoshima, Japan

    R. Hayashi

Authors
  1. H. Imajo
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  2. S. Urabe
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  3. K. Hayasaka
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  4. M. Watanabe
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  5. R. Hayashi
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Imajo, H., Urabe, S., Hayasaka, K. et al. Laser cooling of a small number of Be+ ions in a penning trap. Appl. Phys. B 57, 141–144 (1993). https://doi.org/10.1007/BF00425998

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  • DOI: https://doi.org/10.1007/BF00425998

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