Influence of atmospheric helium on secondary clocks

Ko Han Chen, Chien Ming Wu, Shu Rong Wu, Hsin Hung Yu, Tze Wei Liu, Wang Yau Cheng

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Glass-cell-based secondary clocks, including coherent population trapping (CPT) clocks, are the most used clocks in modern laboratories and in industry.However, the reported frequency accuracies of those secondary clocks were always much worse than expected, though all error sources have been previously discussed. In this report, a high-precision measurement on the spectral frequency-linewidth relation (FL-R) is first used for revealing a new error source in secondary clocks by which we answer the puzzle raised in Opt. Lett. 38, 3186 (2013).

Original languageEnglish
Pages (from-to)4088-4091
Number of pages4
JournalOptics Letters
Issue number14
StatePublished - 15 Jul 2020


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