News

Four EMPIR projects feature in an article in Nature Communications publication

Image showing Fiber optic cables
Fiber optic cables

Comparison of geographically separated ultrastable lasers, over the longest ever reported metrological optical fibre link network, measuring 2,220 km

The research from four projects within EURAMET’s European Metrology Programme for Innovation and Research about ultrastable lasers is described in a recent article in the journal Nature Communications.

The four EMPIR projects are:

Abstract from the article

The article entitled Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network explains what has been achieved in the projects:

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. The article reports a comparison of two geographically separated lasers, over the longest ever reported metrological optical fibre link network, measuring 2,220 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

These EMPIR projects are co-funded by the European Union's Horizon 2020 research and innovation programme and the EMPIR Participating States.


Want to hear more about EURAMET?

Sign up for EURAMET newsletters and other information
Follow us on LinkedIn and Twitter

 

Select your area of interest
Partnership project helps improve the thermal comfort of public buildings in Rwanda and South Africa
2024-04-11

Working with external project Cool White to test and suggest improvements on the locally available white paints more

EMPIR project establishes new calibration capabilities and guide for Ultra-high voltage measurements
2024-04-10

The project FutureEnergy has provided new calibration services for ultra-high voltages and a good practice guide on Lightning Impulse dividers more

EMPIR project releases software and optical constants for the photonics industry
2024-04-08

For many of the 5000 photonics companies in Europe a precise knowledge of a material’s optical properties is vital for industrial competitiveness more

EMPIR project raises awareness of new calibration methods for electronic brachytherapy devices
2024-04-04

The project partners publicised the metrological developments for electronic brachytherapy and were able to contribute to several standards more

Page 1 of 226.