Within the new research group CLEAR we endeavor to understand large scale geological processes that operate deep inside planets. Our approach is to recreate high pressure-temperature conditions in the laboratory and examine various physical properties of minerals and rocks in situ using state-of-the-art spectroscopic techniques. Specifically, we use statically- and dynamically-heated diamond anvil cells together with a pulsed time-resolved broadband optical probe and a precisely-synchronized detector to explore the optical properties of planetary mantles and technological materials at extreme conditions. Details on the experimental setup and its capabilities are provided here. If interested, do not hesitate to contact Sergey S. Lobanov at GFZ for possible research projects.