Laser Setups of the Optical Atomic Clock (IMAGE) Physikalisch-Technische Bundesanstalt (PTB) Caption These are the laser setups of the optical atomic clock being developed at the QUEST Institute of PTB. Credit PTB Usage Restrictions None License Licensed content 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.