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文中介绍中国计量科学研究院(NIM)在微波.光学频率计量基标准研究的新进展:用 NIM4激光冷却-铯原子喷泉钟复现国际单位制(SI)时间单位秒(s),用飞秒(fs)光学频率梳间接复现长度单位米(m)并标定稳频激光波长实际实施米定义。NIM4铯原子喷泉钟的不确定度达到5E-15;fm 光梳锁定到 NIM4钟控制的氢钟后,其频率不确定度为2.2E-14。在此基础上讨论铯原子喷泉钟,稳频激光,fm 光梳的作用,意义和相互关系。最后报道2006年起 NIM 立题研制锶原子存储光钟。
In this paper, we introduce the new progress of NIM in microwave and optical frequency metrology base standards: use NIM4 laser to cool - cesium atomic fountain clock to reproduce the unit of time (SI) in seconds (s) (fs) Optical Frequency Comb Indirectly Reproduce Length Meter (m) and Define Stabilized Laser Wavelength Actual Implementation of Metric Definition. The uncertainty of the NIM4 cesium atom fountain clock is 5E-15; the frequency uncertainty of the fm comb is 2.2E-14 after it is locked to a NIM4-clocked hydrogen clock. On this basis, the discussion cesium atomic fountain clock, frequency stabilized laser, fm light comb role, meaning and relationship. The last report from 2006 NIM legislature strontium atomic storage optical clock.