In my research group, we study materials of relevance for the information and communication technology, such as magnetic ones for digital data storage. We also investigate materials of relevance for quantum computers. To do that, we use light in almost of all its forms, from microwave and terahertz, across the infrared and visible spectra, to the UV and x-ray ranges. The light is coherent, i.e. all our sources are laser-like. For the generation of the shortest wavelengths, we use large scale facilities called "free electron lasers" which are revolutionizing the type of scientific investigation we can perform on materials, molecules and biological samples.