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Coherent fibre link for synchronization of delocalized atomic clocks
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SYSNO ASEP 0555126 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Coherent fibre link for synchronization of delocalized atomic clocks Author(s) Čížek, Martin (UPT-D) RID, ORCID, SAI
Pravdová, Lenka (UPT-D) RID, ORCID, SAI
Pham, Minh Tuan (UPT-D) RID, ORCID, SAI
Lešundák, Adam (UPT-D) RID, ORCID, SAI
Hrabina, Jan (UPT-D) RID, ORCID, SAI
Lazar, Josef (UPT-D) RID, ORCID, SAI
Pronebner, T. (AT)
Aeikens, E. (AT)
Premper, J. (AT)
Havliš, O. (CZ)
Velc, R. (CZ)
Smotlacha, V. (CZ)
Altmannová, L. (CZ)
Schumm, T. (AT)
Vojtěch, J. (CZ)
Niessner, A. (AT)
Číp, Ondřej (UPT-D) RID, SAI, ORCIDNumber of authors 17 Source Title Optics Express. - : Optical Society of America - ISSN 1094-4087
Roč. 30, č. 4 (2022), s. 5450-5464Number of pages 15 s. Publication form Online - E Language eng - English Country US - United States Keywords optical frequency ; transfer ; fibre link ; stability ; metrology ; hydrogen maser ; synchronization Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA19-14988S GA ČR - Czech Science Foundation (CSF) EF16_026/0008460 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UPT-D - RVO:68081731 UT WOS 000754931700066 EID SCOPUS 85124801866 DOI 10.1364/OE.447498 Annotation Challenging experiments for tests in fundamental physics require highly coherent optical frequency references with suppressed phase noise from hundreds of kHz down to mu Hz of Fourier frequencies. It can be achieved by remote synchronization of many frequency references interconnected by stabilized optical fibre links. Here we describe the path to realize a delocalized optical frequency reference for spectroscopy of the isomeric state of the nucleus of Thorium-229 atom. This is a prerequisite for the realization of the next generation of an optical clock the nuclear clock. We present the established 235 km long phase-coherent stabilized cross-border fibre link connecting two delocalized metrology laboratories in Brno and Vienna operating highly-coherent lasers disciplined by active Hydrogen masers through optical frequency combs. A significant part (up to tens of km) of the optical fibre is passing urban combined collectors with a non-negligible level of acoustic interference and temperature changes, which results in a power spectral density of phase noise over 10(5) rad(2).Hz(-1). Therefore, we deploy a digital signal processing technique to suppress the fibre phase noise over a wide dynamic range of phase fluctuations. To demonstrate the functionality of the link, we measured the phase noise power spectral density of a remote beat note between two independent lasers, locked to high-finesse stable resonators. Using optical frequency combs at both ends of the link, a long-term fractional frequency stability in the order of 10(-15) between local active Hydrogen masers was measured as well. Thanks to this technique, we have achieved reliable operation of the phase-coherent fibre link with fractional stability of 7 x 10(-18) in 10(3) s. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2023 Electronic address https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-4-5450&id=469194
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