Controlling efficiency of laser drilling

This study theoretically identifies the conditions for the keyhole collapse during drilling with a high intensity laser beam. Laser drilling is widely used in components, packaging and manufacturing technologies [1,2]. The approach adapted is to probe the quasi-steady, one-dimensional supersonic flow behavior of the two-phase, vapor-liquid dispersion in a vertical keyhole of varying cross-section, paying particular attention to transition between annular and slug flows [3-5]. Drilling with a pulsed laser beam evidently can change energy absorption and drilling speed. The results therefore find that thermal drilling is susceptible to become incapable subject to higher absorbed energy, and drilling velocity. Finding factors to enhance efficiency and quality of drilling is therefore provided in this work.