Patent ID: 6929886
Filing Date: 2005-08-16
Classification: B23K,G03F,Y10S

Abstract:
1. A method for manufacturing patterns on a reticle blank comprising a substrate made from material transparent to UV irradiation and having a first surface and a second opposite surface, the first surface coated with a coating layer, the method comprising: providing at least one of a plurality of ultra-short pulsed laser beams; providing focusing means for focusing said at least one of a plurality of ultra-short pulsed laser beams at at least one of a plurality of target locations; providing controlling means for controlling the synchronization and operation of the laser beam source and the focusing means; and irradiating the ultra-short pulsed laser beam in a predetermined pattern directed at the second surface and passing through the substrate, wherein said at least one of a plurality of target locations is focused within a subsurface region of the substrate in front of the coating layer, thereby producing the predetermined pattern in the coating layer.