Introduction

Lasers can be considered non-conventional machine tools and find applications in industry because of their precision of operation, low cost, localized processing, and high speed of operation. In laser drilling applications, a focused laser beam is used as heat source increasing temperature rapidly to the melting and evaporation temperature of the substrate material. Since the arrangements of the optical setting for the laser beam is very precise, the localized heating can be controlled easily and desired hole features can be accomplished with maximum accuracy and minimum defects.