Preparation of Ultracold Li＋ Ions by Sympathetic Cooling in a Linear Paul Trap

The 7Li＋ ion is one of the most important candidates for verifying QED theory and obtaining the precise value of the fine-structure constant ~. However, direct laser cooling of trapped Li＋ ions will lead to strong background fluorescence which will influence the spectrum detection. The sympathetic c...

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Published inChinese physics letters Vol. 32; no. 8; pp. 70 - 73
Main Author 陈婷 杜丽军 宋红芳 刘培亮 黄垚 童昕 管桦 高克林
Format Journal Article
LanguageEnglish
Published 01.08.2015
Subjects
Constants
Cooling
Crystals
Fluorescence
Quantum electrodynamics
Spectra
制备
动力学理论
混合离子
激光冷却
精细结构常数
线性
锂离子
陷阱
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/8/083701

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Summary:The 7Li＋ ion is one of the most important candidates for verifying QED theory and obtaining the precise value of the fine-structure constant ~. However, direct laser cooling of trapped Li＋ ions will lead to strong background fluorescence which will influence the spectrum detection. The sympathetic cooling technique is a good choice to solve the problem. In this work, we report sympathetic cooling of 7 Li＋ ions to few mK using 40Ca＋ ions in a linear Paul trap. A mixed ion crystal of 40Ca＋ ions and 7Li＋ ions are obtained. We also analyze the motion frequency spectra of pure 40 Ca＋ ions and mixed ions.
Bibliography:The 7Li＋ ion is one of the most important candidates for verifying QED theory and obtaining the precise value of the fine-structure constant ~. However, direct laser cooling of trapped Li＋ ions will lead to strong background fluorescence which will influence the spectrum detection. The sympathetic cooling technique is a good choice to solve the problem. In this work, we report sympathetic cooling of 7 Li＋ ions to few mK using 40Ca＋ ions in a linear Paul trap. A mixed ion crystal of 40Ca＋ ions and 7Li＋ ions are obtained. We also analyze the motion frequency spectra of pure 40 Ca＋ ions and mixed ions.
CHEN Ting, DU Li-Jun, SONG Hong-Fang, LIU Pei-Liang, HUANG Yao, TONG Xin, GUAN Hua, GAO Ke-Lin（ 1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 2Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 3 University of Chinese Academy of Sciences, Beijing 100190）
11-1959/O4
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/8/083701