Our group explores the interaction of light and neutral atoms at temperatures where the qantum nature of the external motion becomes important. Our research covers topics such as precision spectroscopy, laser cooling, quantum gases, optical lattices, ultracold atoms in optical cavities. Our work is motivated both by the desire to understand fundamental phenomena of quantum mechanics as well as learning to handle clean quantum mechanical systems in the lab on an engineering level. Our interest in light-matter interactions frequently creates the need for novel precision laser tools. This leads us to give significant attention to the development of project-specific laser sources.