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

作　　者：陈婷 杜丽军 宋红芳 刘培亮 黄垚 童昕 管桦 高克林 

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 [2]Key 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

出　　处：《Chinese Physics Letters》2015年第8期70-73,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant No 2010CB832803;the National Natural Science Foundation of China under Grant Nos 11004222 and 91121016;the Chinese Academy of Sciences

摘　　要：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.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.

关 键 词：Preparation of Ultracold Li QED Ions by Sympathetic Cooling in a Linear Paul Trap Ca 

分 类 号：O562[理学—原子与分子物理] TM912[理学—物理]