Abstract

In laser micro drilling, on changing the focal plane position of the workpiece, there is a significant change in the hole characteristics. This change can be used as an application in some of the industries. In this experiment, the effect of change in focal plane position in the positive, that is upward, direction on the hole parameters is studied and explained. A stainless steel 316 plate is used as the workpiece and a diode-pumped nanosecond pulsed laser is used for micro drilling because of its accuracy and comparatively low cost than picosecond or femtosecond pulsed lasers. It is seen that a significant change in the entry diameter, exit diameter and taper of the hole takes place when the focal plane position is changed. Also, this is carried out at different laser powers.

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