Patent ID: 7257144
Filing Date: 2007-08-14
Classification: H01S

Abstract:
1. An excimer laser comprising: a chamber for containing laser gases; a pair of electrodes for producing electronic discharge, said electrodes disposed with respect to each other in said chamber to form an active region therebetween, light being emitted from said active region when a voltage is applied to said electrodes; an optical resonant cavity, said active region coinciding with at least a portion of said optical resonant cavity, said light emitted from said active region resonating within said optical resonant cavity thereby forming a laser beam; a window on said chamber for egress of said laser beam from said chamber, said laser beam propagating through a portion of said window coincident with said laser beam; a fan for circulating said laser gases in said chamber and through said active region; and a baffle for restricting the flow of gas across said portion of said window coincident with said laser beam, wherein said baffle comprises a stop disposed in front of said window, said stop having an aperture for said laser beam to pass.