| 不确定度和稳定度达10-18量级的钙离子光频标 |
| Ca+ optical frequency standard with systematic uncertainty and stability at the 10-18 level |
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| 中文摘要: |
| 主要回顾了中国科学院精密测量科学与技术创新研究院在液氮低温钙离子光频标的物理系统设计、不确定度评估与稳定度的优化与测量等方面的工作。液氮低温系统为钙离子创造了液氮的温度环境（~ 80 K），极大降低了钙离子光频标的黑体辐射频移，使钙离子光频标的系统不确定度降至3.0 × 10-18，成为第五种不确定度进入10-18的原子/离子光频标体系。为了优化钙离子光频标的稳定度，将钟激光频率参考在Ramsey条纹上，并引入了参考条纹判定算法及自动寻峰算法，使钙离子光频标可长期稳定运行，长期稳定度达到6.3 × 10-18@524 000 s。 |
| 英文摘要: |
This paper mainly reviews the work on the physical system design of the liquid?nitrogen?cooled 40Ca+ optical clock, the evaluation of its uncertainty and the optimization of the stability for the 40Ca+ optical clocks in the Innovation Academy for Precision Measurement Science and Technology of the Chinese Academy of Sciences. The liquid?nitrogen?cooled system creates a liquid?nitrogen temperature environment (～![]() ![]() 80 K) for the 40Ca+, which greatly reduces the blackbody radiation (BBR) frequency shift of the 40Ca+ optical clock, and improve its systematic uncertainty to 3.0?×?![]() ![]() 10-18, becoming the fifth type of atomic/ion optical clocks with uncertainty reaching to the 10-18 level. In order to optimize the stability of the 40Ca+ optical clock, the clock laser frequency was referenced to the Ramsey fringe, and the reference fringe determination algorithm and the automatic peak?finding algorithm were introduced, making the 40Ca+ optical clocks run stably for a long time and reach a stability of 6.3?×?![]() ![]() 10-18 with an averaging time of 524 000 s. |
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| 中文关键词: 光频标 液氮低温光频标 不确定度 稳定度 |
| 英文关键词:optical frequency standard liquid⁃nitrogen⁃cooled optical frequency standard frequency uncertainty frequency stability |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2023.03.11 |
| 引用本文：黄垚, 管桦, 高克林.不确定度和稳定度达10-18量级的钙离子光频标[J].计测技术,2023,(3):. |
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