The absolute frequency of the 87Sr optical clock transition
The absolute frequency of the 87Sr optical clock transition
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DOI：
10.1088/0026-1394/45/5/008
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发表时间：
2008-04
期刊：
影响因子：
2.4
通讯作者：
G. Campbell;A. Ludlow;S. Blatt;J. Thomsen;Michael J. Martin;M. D. de Miranda;T. Zelevinsky;M. Boyd-M.
中科院分区：
文献类型：
--
作者：
G. Campbell;A. Ludlow;S. Blatt;J. Thomsen;Michael J. Martin;M. D. de Miranda;T. Zelevinsky;M. Boyd-M.
使用晶格限制原子测得 87Sr 1S0–3P0 时钟跃迁的绝对频率为 429 228 004 229 873.65 (37) Hz，其中 8.6 × 10−16 的分数不确定度代表迄今为止原子跃迁频率最准确的测量之一。经过对系统效应的详细研究，将 Sr 晶格时钟的总系统不确定性降低到 1.5 × 10−16，时钟频率是根据氢微波激射器测量的，该氢微波激射器同时校准为美国主要频率标准，NIST 铯喷泉时钟，NIST-F1。使用基于飞秒激光的光学频率梳对光学和微波光谱区域进行相位相干连接，并通过 3.5 km 光纤传输方案来比较远程时钟信号，从而可以进行比较。
The absolute frequency of the 1S0–3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10−16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5 × 10−16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fibre transfer scheme to compare the remotely located clock signals.