Femtosecond-comb based 10 MHz-to-optical frequency link with uncertainty at the 10^(－18) level
Femtosecond-comb based 10 MHz-to-optical frequency link with uncertainty at the 10^(－18) level
复制标题
基于飞秒梳的10 MHz光频链路，不确定性达到10^(－18)级
DOI：
10.1088/1681-7575/ac938d
复制
发表时间：
2022
期刊：
影响因子：
2.4
通讯作者：
Inaba Hajime
中科院分区：
文献类型：
--
作者：
Wada Masato;Inaba Hajime
在不久的将来，国际单位制（SI）对“秒”的定义可能会在光频区域重新定义。因此，在与人造卫星的频率链路中使用的10 MHz与用于观测光学时钟中的时钟跃迁的超稳定激光之间的频率链路中的不确定性降低是新定义中的数值确定和重新定义后的国际原子时操作的重要问题。我们已经评估了在10 MHz和光频之间使用飞秒梳的频率链路中所有可能的不确定性因素，并通过温度稳定的RF乘法器和使用温度不敏感的同轴电缆获得了迄今为止报道的最低不确定性3.9× 10− 18。此外，我们还通过使用两个飞秒梳参考共同的10 MHz源同时测量相同激光器的光学频率来验证频率链路的不确定性，并确认与评估的不确定性一致。
The International System of Units (SI) definition of the'second'is likely to be redefined in the optical frequency region in the near future. Therefore, uncertainty reduction in the frequency link between 10 MHz, which is used in the frequency link with an artificial satellite, and the ultrastable laser for observing clock transitions in optical clocks, is an important issue for numerical determination in the new definition and for International Atomic Time operation after the redefinition. We have evaluated all the possible uncertainty factors in the frequency link with a femtosecond comb between 10 MHz and an optical frequency and obtained the lowest uncertainty yet reported of 3.9× 10− 18 by temperature-stabilizing RF multipliers and by using temperature insensitive coaxial cables. Furthermore, we have validated the uncertainty of the frequency link by simultaneously measuring an optical frequency of an identical laser using two femtosecond combs referenced to a common 10 MHz source and confirmed to be consistent with the evaluated uncertainty.