INDUSTRY AND RESEARCH NEWS through optical fiber to a much larger community of users, ranging from other national laboratories, academia and industry. This work is available at: M. Schioppo et al. “Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network,” Nature Communications (2022), https://doi.org/10.1038/s41467-02127884-3. Marco Schioppo, Senior Research Scientist, NPL states: “This work is important as it demonstrates that it is possible to compare two geographically distant ultrastable lasers and measure their fundamental noise using an optical fiber network. We show that ultrastable lasers can be used to effectively measure the total fiber link noise. We also assess the possibility to disseminate ultrastable light to distant users through optical fiber. Our work is an important step towards making available the time and frequency high-precision measurement capability of a
national metrological institute to a wide range of users.” Jochen Kronjäger, Senior Research Scientist, NPL states: “I find it absolutely fascinating to see how two world-leading ultrastable lasers, developed independently and both pushing the boundaries of optical technology, can be compared to reveal their fundamental noise, despite being separated geographically by almost 800 km. It’s a fantastic demonstration of the power of light, made possible by many years of international collaboration.” Corresponding authors: Marco Schioppo marco.schioppo@npl.co.uk Jochen Kronjäger jochen.kronjaeger@npl.co.uk Source: https://www.npl.co.uk/news/record-comparison-ofdistant-ultrastable-lasers
CAL-TOONS by Ted Green
teddytoons@icloud.com
MEH. THEY CALL THEMSELVES “THE RESISTANCE.” JUST IGNORE THEM.
Cal Lab: The International Journal of Metrology
18
Jan • Feb • Mar 2022
