The87Sr optical frequency standard at PTB
Open accessAbstract
With 87 Sr atoms confined in a one-dimensional optical lattice, the frequency of the optical clock transition 5s 2 1 S 0 –5s5p 3 P 0 has been determined to be 429 228 004 229 872.9(5) Hz. The transition frequency was measured with the help of a femtosecond-frequency comb against one of Physikalisch-Technische Bundesanstalt (PTB's) H-masers whose frequency was measured simultaneously by the PTB Cs-fountain clock CSF1. The Sr optical frequency standard contributes with a fractional uncertainty of 1.5 × 10 −16 to the total uncertainty. The agreement of the measured transition frequency with previous measurements at other institutes supports the status of this transition as the secondary representation of the second with the currently smallest uncertainty.
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With a lifetime of the excited clock state of about 120 s and the light shift coefficient of about -13 Hz cm^2 W^-1, the clock laser induced light shift is estimated to be negligible, of few 10^-19.
“With a lifetime of the excited clock state of about 120 s [44-46] and the light shift coefficient of about -13 Hzcm 2 W -1 [47], we estimate a negligible clock laser induced light shift of few 10 -19 .”
From Long-distance chronometric leveling with a portable optical clock (2024) · cites this paper as [46]
The citation is attached to the light-shift coefficient, not the lifetime or the citing authors’ estimate. Section 3.1 (page unavailable) gives the clock-laser coefficient as +13(2) Hz (W cm⁻²)⁻¹, whereas the citing sentence gives −13; the magnitudes agree, but the signs are opposite. (LLM, conf=0.86)
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“9(4) × 10 − 17 .”
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- Authors
- Falke, S., Schnatz, H., Winfred, J. S. R. V., Middelmann, T., Vogt, S., Weyers, S., Lipphardt, B., Grosche, G., Riehle, F., Sterr, U., & Lisdat, C.
- Affiliations
- Physikalisch-Technische Bundesanstalt (DE)
- Venue
- Metrologia
- Publisher
- IOP Publishing
- Published
- 2011-09-12
- Volume
- 48
- Issue
- 5
- Pages
- 399-407
- ISSN
- 0026-1394 (ISSN-L)
- 1681-7575
- OpenAlex
- W2016860894
- Cited by
- 129
- References
- 43
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 9 · 2023: 4 · 2022: 2 · 2021: 3 · 2020: 11 · 2019: 6 · 2018: 9 · 2017: 4 · 2016: 9 · 2015: 11 · 2014: 16 · 2013: 19 · 2012: 19
- FWCI
- 9.55
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Metrologia (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Frequency and Time Standards
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Scientific Measurement and Uncertainty Evaluation
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Electrical Measurement Techniques
- Keywords
- strontium-87, optical frequency standard, optical clock transition, one-dimensional optical lattice, femtosecond optical frequency comb, cesium fountain clock, atomic clocks
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