An argon-fluoride laser that emits ultraviolet light that is emitted in pulses at a wavelength of 193 nm. The term Excimer comes from the concept of an energised molecule with two identical components or excited dimer (contracted to one word exci-mer). Each pulse of this his "cool" laser removes 1/4000 millimetre of tissue from the targeted surface by breaking intra molecular bonds in collagen molecules. It would take about 200 pulses from an Excimer laser to cut a human hair in half. This laser was originally developed for use in the microprocessor industry and later found its application in vision correction.