| abstract |
An extreme-ultraviolet (EUV) light source comprising an optic, a target material, mid a laser beam passing through said optic along a beam path to irradiate said target material; The EUV light source further includes a system generating a gas flow directed toward said target material along said beam -path, said system having a tapering member surrounding a volume and a plurality of gas lines, each gas fine outputtmg a gas stream into said volume. |