Improved short-term stability of optical frequency standards: approaching 1 Hz in 1 s with the Ca standard at 657 nm.
Improved short-term stability of optical frequency standards: approaching 1 Hz in 1 s with the Ca standard at 657 nm.
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DOI：
10.1364/ol.25.001603
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发表时间：
2000-11
期刊：
影响因子：
3.6
通讯作者：
C. Oates;E. A. Curtis;L. Hollberg
中科院分区：
文献类型：
--
作者：
C. Oates;E. A. Curtis;L. Hollberg
对于中性（40）Ca基光学频率标准，我们报告了1 s内4 x 10（-15）的分数频率不稳定性，这代表了比现有原子频率标准提高5倍。利用光学Bordé-Ramsey光谱技术，对10（7）个被囚禁原子的样品，我们分辨出了窄至200 Hz（FWHM）的线宽。对于较冷的原子，该系统可能在1 s内实现低至2 x 10（-16）的不稳定性。这种低的不稳定性对于频率标准和基础物理的精密测试是重要的。
For a neutral (40)Ca-based optical frequency standard we report a fractional frequency instability of 4 x 10(-15) in 1 s, which represents a fivefold improvement over existing atomic frequency standards. Using the technique of optical Bordé-Ramsey spectroscopy with a sample of 10(7) trapped atoms, we have resolved linewidths as narrow as 200 Hz (FWHM). With colder atoms this system could potentially achieve an instability as low as 2 x 10(-16) in 1 s. Such low instabilities are important for frequency standards and precision tests of fundamental physics.