Patent ID: 6678304
Filing Date: 2004-01-13
Classification: B23K,G03F

Abstract:
A laser correction apparatus comprising: a laser source or emitting a laser beam; an optical system having an objective lens for irradiating upward the laser and focusing the laser onto a defect on a thin film formed on a bottom surface of a substrate to expel said defect from said substrate; a window port interposed between said bottom surface of said substrate and said objective lens, said window port including a top surface opposing said bottom surface of said substrate with a space therebetween and having a central opening for allowing the laser to pass therethrough, and an inner wall including an upper portion extending from said central opening and a lower portion having a larger diameter than said upper portion, said lower portion having a plurality of gas outlet ports therein; a plurality of gas inlet ports for introducing a gas to the space between said bottom surface of said substrate and said top surface of said window port from a periphery of said top surface toward said central opening, said central opening allowing the gas to pass therethrough toward said inner wall; and a gas exhaust section for exhausting the gas including said defect through said gas outlet ports.