PREIN - (Photonics Research and Innovation) Flagship is a Photonics Research and Innovation platform focusing on light-based solutions from scientific excellence to industrial and societal impact. PREIN partners are worldwide leaders in photonics. The Flagship on Photonics Research and Innovation (PREIN) is one of the 6 Finnish Flagships, a northern fleet of excellent science, successful collaboration and solutions for tomorrow. The Flagship programme managed by the Academy of Finland provides a new and unique way for R&D&I in Finland. It supports future knowledge and sustainable solutions to societal challenges and seeks to advance economic growth by developing new business opportunities. PREIN is a light-based technologies competence cluster for multi-disciplinary science, industry, and society. Combining the extensive resources and infrastructures of all its partners (Tampere University, Aalto University, University of Eastern Finland and VTT), PREIN covers all the value chain from fundamental research to applied research, product development and commercialization. Photonics and light-based technologies play a central role in all areas of modern life, including in telecommunications, biomedicine, health care, energy and environment, manufacturing, and consumer products.