Patent ID: 8629416
Filing Date: 2014-01-14
Classification: B23K,G03F,G21G,H01J

Abstract:
1. A method of forming a microscopic structure on a substrate of a material having a first ablation threshold using a laser beam, the laser beam having a spot size, the method comprising: forming a mask of a material having a second ablation threshold on the substrate surface using a fabrication process capable of producing mask features smaller than the laser beam spot size, the second ablation threshold being higher than the first ablation threshold; and directing the laser beam toward the substrate surface, the laser beam having a fluence above the first ablation threshold and having a spot size that is larger than the smallest design features of the mask, the mask protecting portions of the substrate that are covered by the mask to produce features in the substrate by laser processing, the features in the processed substrate being smaller than the laser beam spot size.