Stuart Reid, research team leader at the Institute of Thin Films, Sensors and Imaging in the School of Engineering and Computing at the University of the West of Scotland: “It has been fantastic to work with Pascal and the wider team at Polygon Physics. These novel ECR ion sources are uniquely clean and flexible, allowing the fabrication of ultra-low loss optical coatings for the most demanding applications, e.g. upgrades for future gravitational wave detectors.”