Absolute frequency measurement of a Lu⁺ (³\rm D₁) optical frequency standard via link to international atomic time

2025/02/14 by Zhao Zhang, Qichao Zhao, Zhang, Zhao +11 · 1 citation
Physics and Astronomy · Decision Sciences · Engineering · #Advanced Frequency and Time Standards #Scientific Measurement and Uncertainty Evaluation #Advanced Measurement and Metrology Techniques

paper · pdf · doi:10.48550/arxiv.2502.10004

Abstract

We report on an absolute frequency measurement of the \rm Lu⁺ (³\rm D₁) standard frequency which is defined as the hyperfine-average of ¹\rm S₀ to ³\rm D₁ optical clock transitions in ¹⁷⁶\rm Lu⁺. The measurement result of 353 638 794 073 800.35(33)Hz with a fractional uncertainty of 9.2 × 10^-16 was obtained by operating a single-ion ¹⁷⁶\rm Lu⁺ frequency standard intermittently over 3 months with a total uptime of 162 hours. Traceability to the International System of Units (SI) is realized by remote link to International Atomic Time. This is the first reported absolute frequency value for a \rm Lu⁺ (³\rm D₁) optical frequency standard.

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