Excimer lasers is a research field investigating a class of pulsed ultraviolet gas lasers that utilize the formation and rapid dissociation of transient diatomic molecules or complexes (excimers/exciplexes) as their gain medium. This area of study focuses on the fundamental photochemistry and kinetics underlying excimer formation, the development and optimization of laser systems providing high peak power and short pulse durations in the UV spectrum, and their significant applications in microelectronics fabrication, precision material ablation, and medical procedures.