| 钙离子光频标钟跃迁绝对频率测量 |
| Absolute frequency measurement of Ca+ optical frequency standard clock transition |
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| 中文摘要: |
| 回顾了中国科学院精密测量科学与技术创新研究院对钙离子光频标钟跃迁绝对频率的测量工作，并对测量结果被国际计量委员会（CIPM）下属的时间频率咨询委员会（CCTF）采纳的情况进行了总结和描述。在2011～2020年间，利用实验室型光频标和可搬运光钟，采用基于飞秒光梳和卫星链路的方案溯源到国际秒定义，及基于飞秒光梳直接溯源到中国计量科学研究院铯喷泉微波钟的方案，多次测量了钙离子光频标钟跃迁绝对频率，测量不确定度从10-15量级逐步提高到10-16量级，共计4个测量结果被CCTF采纳。参与钙离子光频标钟跃迁频率国际推荐值的计算，分别于2012年、2015年、2017年和2021年先后四次更新了钙离子光频标钟跃迁频率推荐值。钙离子光频标钟跃迁于2021年被推荐为新增的“秒的次级表示”。 |
| 英文摘要: |
| This paper reviews the measurements of absolute frequency of the transition of calcium ion optical frequency standard, made by the Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, and describes the history of the absolute frequency measurement results accepted by the Consultative Committee for Time and Frequency (CCTF) of the International Committee for Weights and Measures (CIPM). During the years between 2011 and 2020, based on the laboratory optical frequency standard and the transportable optical clock, by using the femtosecond optical frequency comb both referenced to the SI second through the satellite links, and directly traced to a cesium fountain clock made by the National Institute of Metrology (NIM), the absolute frequency of the clock transition for the calcium ion optical frequency standard was measured for a few times, and the measurement uncertainty was gradually improved from the order of 10-15 to the order of 10-16. Four measurement results were adopted by the CCTF to participate in the calculation of the internationally recommended frequency of the calcium ion optical clock transition, and the recommended value was updated for four times in 2012, 2015, 2017 and 2021, respectively. The calcium ion optical clock transition was recommended in 2021 as a new "secondary representation of the SI second". |
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| 中文关键词: 光频标 可搬运光钟 绝对频率测量 飞秒光梳 秒定义 |
| 英文关键词:optical frequency standard transportable optical clocks absolute frequency measurement femtosecond optical frequency comb SI second |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2022.05.09 |
| 引用本文：黄垚, 王玉琢, 林弋戈, 方占军, 管桦, 高克林.钙离子光频标钟跃迁绝对频率测量[J].计测技术,2022,(5):. |
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