May 9-14, 2021 CLEO Promotes Breakthroughs in Research and Applied Innovations With comprehensive, peer-reviewed technical sessions and market-focused programming, CLEO is the world’s premier international forum to learn about innovative advances, research and new technologies from the laser science industry. From quantum computing to advanced imaging technologies used to the search for new life and planets in the galaxy, CLEO brought together all aspects of electro-optic technologies.