The team’s efforts are dedicated to optical components fabrication and control, with emphasis on aspherics for special needs requiring high-end components fabricated in very small numbers and on the absolute interferometric testing of wavefronts emerging from those components. It also contributes to optical design as a partner in projects from other LCFIO groups or from other laboratories or institutions. The two main proper axes of research of the team are aspherisation by broad ion beam milling and optical metrology. The techniques developed in both domains are usually led by the highly demanding requirements of scientific experiments or extreme ultraviolet astronomical space telescopes. These two domains are tightly related to the team’s experience in optical design and simulations.