Nearfield Intensity Profiles (image) Physikalisch-Technische Bundesanstalt (PTB) Caption These are nearfield intensity profiles of a fibre measured with the UV beam coming from different directions. These profiles show that the light is single-mode. Credit (figure: PTB) Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.