囚禁离子光频标的比对实验

项目名称： 囚禁离子光频标的比对实验

项目编号： No.11304363

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 黄垚

作者单位： 中国科学院武汉物理与数学研究所

项目金额： 30万元

中文摘要： 近二十年来光频标得到了飞速发展，国际上最好的光频标在性能指标上已经超过了Cs喷泉钟。可以预见，光频标还会得到进一步的发展，从而在认识客观物理世界和满足国家重大需求等方面开创新的时代。我们小组近十多年来坚持开展了囚禁冷却钙离子光频标的实验工作。为了进一步提高性能，找到限制钙离子光频标稳定度及不确定度的瓶颈所在，本项目拟在一台已经实现锁定的钙离子光钟基础上，对已搭建的第二套离子阱进行优化，实现第二套离子阱系统的长时间离子囚禁；提高钟跃迁探测激光器的稳定性，得到线宽小于20Hz的钟跃迁探测谱线；实现两台钙离子光频标的同时锁定，比对10000秒稳定度进入10^-16量级；在此基础上对运动效应引起的频移、激光强度引起的ac Stark频移等系统误差进行进一步研究和评估，减小钙离子光频标的系统不确定度。

中文关键词： 离子阱；光频标；单离子；激光稳频；

英文摘要： The optical frequency standards have been rapidly developed in the past two decades, the best optical frequency standard developed has better performance than the Cs fountain clock. It can be predicted that the optical frequency standard will be further developed to understand the physical world, also can meet the needs of the country, and openning up a new era. Our research group is being developing an optical frequency standard based on a sigle trapped calcium ion over the past decade. In order to reach a better performance, we have to find which part is limiting us. Therefore, based on the first calcium ion optical clock already realized, this project will improve the second ion trapping system, achieving ion trapping for very long time; and the probe laser will be improved with better performace and a <20 Hz linewidth of the clock transiton can be achieved; after that we will run the two optical clocks for the same time and a comparison stabilty of 10^-16 level will be measured at an averaging time of 10000 s; by comparing the two clocks the systematic shifts including shifts caused by motions, ac Stark shifts caused by laser powers will be further evaluated, eventually reduce the systematic uncertainty of the calcium ion optical clock.

英文关键词： ion trap；optical frequency standard；single ion；laser frequency stabilization；