Dark-state suppression and optimization of laser cooling and fluorescence in a trapped alkaline-earth-metal single ion

Thomas Lindvall, Mikko Merimaa, I. Tittonen, A.A. Madej

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

We study the formation and destabilization of dark states in a single trapped 88Sr+ ion caused by the cooling and repumping laser fields required for Doppler cooling and fluorescence detection of the ion. By numerically solving the time-dependent density matrix equations for the eight-level system consisting of the sublevels of the 5s2S1/2, 5p2P1/2, and 4d2D3/2 states, we analyze the different types of dark states and how to prevent them in order to maximize the scattering rate, which is crucial for both the cooling and the detection of the ion. The influence of the laser linewidths and ion motion on the scattering rate and the dark resonances is studied. The calculations are then compared with experimental results obtained with an endcap ion trap system located at the National Research Council of Canada and found to be in good agreement. The results are applicable also to other alkaline-earth-metal ions and isotopes without hyperfine structure.
Original languageEnglish
Article number033403
JournalPhysical Review A: Atomic, Molecular, and Optical Physics
Volume86
Issue number3
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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