Queen's 2015 Nobel Prize in PhysicsPhD student Troy Allen was one of 4 keynote speakers at the 12th CIRP Conference on Photonic Technologies - LANE 2022 (taking place in Fürth, Germany). Troy's plenary talk reviewed the state of the art in laser manufacturing monitoring and, in particular, his work in Simultaneous high-speed keyhole depth and absorptance measurements in laser spot welding of dissimilar metals.