OBJECT HAVING THROUGH-HOLE FORMED THEREIN AND LASER PROCESSING METHOD

摘要

A processing method for forming a through-hole in a workpiece (1) by using a pulse laser beam. The method has a step of forming a detachable sacrificial layer (la) on the workpiece (1), a step of forming the through-hole (5) in the workpiece by a laser beam with the sacrificial layer (la) formed on the workpiece, and a step of removing the sacrificial layer (5) from the workpiece after the through-hole forming step.