Schioppo, M;
Kronjäger, J;
Silva, A;
Ilieva, R;
Paterson, JW;
Baynham, CFA;
Bowden, W;
... Grosche, G; + view all
(2022)
Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network.
Nature Communications
, 13
(1)
, Article 212. 10.1038/s41467-021-27884-3.
Preview |
Text
s41467-021-27884-3.pdf - Other Download (3MB) | Preview |
Abstract
Ultrastable lasers are essential tools in optical frequency metrology enabling unprecedented measurement precision that impacts on fields such as atomic timekeeping, tests of fundamental physics, and geodesy. To characterise an ultrastable laser it needs to be compared with a laser of similar performance, but a suitable system may not be available locally. Here, we report a comparison of two geographically separated lasers, over the longest ever reported metrological optical fibre link network, measuring 2220 km in length, at a state-of-the-art fractional-frequency instability of 7 × 10−17 for averaging times between 30 s and 200 s. The measurements also allow the short-term instability of the complete optical fibre link network to be directly observed without using a loop-back fibre. Based on the characterisation of the noise in the lasers and optical fibre link network over different timescales, we investigate the potential for disseminating ultrastable light to improve the performance of remote optical clocks.
| Type: | Article |
|---|---|
| Title: | Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41467-021-27884-3 |
| Publisher version: | https://doi.org/10.1038/s41467-021-27884-3 |
| Language: | English |
| Additional information: | Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
| Keywords: | Fibre optics and optical communications, Fluorescence spectroscopy, Optical metrology, Optical sensors, Seismology |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10147642 |
Archive Staff Only
 |
View Item |
