PTB和NIST的光学钙频率标准
The optical calcium frequency standards of PTB and NIST
摘要：
本文介绍了两个实验室研制的激光冷却中性原子Ca光频标的现状，其目的是研制未来可能的光学原子钟。在德国联邦物理技术研究所（PTB）和美国国家标准与技术研究所（NIST）进行的频率测量使40 Ca的时钟跃迁频率成为最知名的光学频率之一（相对不确定度1.2e-14），两个实验室对该频率的测量结果在各自的不确定度范围内。将标准的相对不确定性提高几个数量级的前景看来是可行的。
英文摘要：
We describe the current status of the Ca optical frequency standards with laser-cooled neutral atoms realized in two different laboratories for the purpose of developing a possible future optical atomic clock. Frequency measurements performed at the Physikalisch-Technische Bundesanstalt (PTB) and the National Institute of Standards and Technology (NIST) make the frequency of the clock transition of 40Ca one of the best known optical frequencies (relative uncertainty 1.2e-14) and the measurements of this frequency in both laboratories agree to well within their respective uncertainties. Prospects for improvement by orders of magnitude in the relative uncertainty of the standard look feasible.
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