This book delivers up-to-date reviews of progress in ultrafast intense laser science, an expanding interdisciplinary research field spanning atomic and molecular physics, molecular science, solid state physics, and optical science, which has been stimulated by the recent developments in ultrafast laser technologies. Each volume compiles peer-reviewed articles authored by researchers at the forefront of their own subfields of ultrafast intense laser science. Every chapter opens with an overview of the topics to be discussed, so that researchers unfamiliar to the subfield, as well as graduate students, can grasp the importance and attractions of the research topic at hand; these are followed by reports of cutting-edge discoveries. The eighteenth volume covers a broad range of topics from this interdisciplinary research field, focusing on molecular photoionization, atoms and molecules in intense laser fields, excitation processes in intense laser fields, photonics and materials, high-order harmonics generation, light-matter interaction, XFEL and high-power lasers, and quantum computing.