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利用塞曼减速法实现锶同位素的磁光阱俘获

Trapping Four Isotopes of Strontium in a MOT by Using Zeeman Slowing

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摘要

利用塞曼减速法在磁光阱(MOT)中实现锶原子一级冷却,使用塞曼减速器对进入阱区前的热原子束进行减速,实验时该减速器线圈通入10.2 A电流,阱区反亥姆霍兹线圈通入10 A电流时,中心区域线性磁场梯度为4 mT/cm,用于冷却和俘获的激光波长为461 nm,其对应于锶原子(5s2)1S0→(5s5p)1P1的能级跃迁。通过实验获得了锶4种同位素的冷原子团、探测到相应的冷原子荧光光谱,并且测定其中88Sr,87Sr和86Sr的冷原子数目分别为1.759×106,1.759×105和2.638×105。

Abstract

Optical clock is reported that the capture of cold strontium (Sr) atoms in a magneto-optical trap (MOT) by using Zeeman slowing. The MOT is loaded from a thermal atomic beam which is decelerated by a Zeeman slower having 10.2 A electric current. The anti-Helmholtz coils of MOT have 10 A current and then can induce a linear magnetic field. Its gradient is 4 mT/cm in the central zone. The 461 nm laser is used for Zeeman slowing and trapping which corresponds to the transition of Sr atomic level (5s2)1S0→(5s5p)1P1 . According to the experiment,four isotopes of Sr in MOT are obtained and the fluorescent spectrums of the atoms are detected. Using the fluorescence,the number of three isotopes 88Sr,87Sr ,86Sr is measured,which is 1.759×106,1.759×105 and 2.638×105 separately.

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中图分类号:O431.2

DOI:10.3788/aos20103003.0898

所属栏目:量子光学

基金项目:国家973计划(2005CB72440)和中国科学院重要方向项目(KJCX2-YW-T12)资助课题。

收稿日期:2009-05-11

修改稿日期:2009-05-19

网络出版日期:0001-01-01

作者单位    点击查看

田晓:中国科学院国家授时中心,陕西 西安 710600中国科学院 研究生院,北京 100049
常宏:中国科学院国家授时中心,陕西 西安 710600
王心亮:中国科学院国家授时中心,陕西 西安 710600
张首刚:中国科学院国家授时中心,陕西 西安 710600

联系人作者:田晓(tianxiao_1005@sina.com.cn)

备注:田晓|主要从事光频标方面的研究|(1984-),女,硕士研究生。

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