Cymer is an independently operated business within the ASML group that develops, manufactures and services deep-ultraviolet (DUV) light sources. The product portfolio includes excimer lasers using argon fluoride (ArF) or krypton fluoride (KrF) gases to generate light in the deep-ultraviolet spectrum. These lasers generate the light that photolithography scanners use to image patterns on silicon wafers. The research, development and manufacturing of DUV light sources is centered in San Diego.