摘要
A theoretical model was developed to describe blind hole profiles in Nd :YAG laser dril- ling. In most cases, the drilled holes resemble a spindle-like shape as is predicted by the theorctical model. Derived from the model, an interesting and useful phenomenon: the so-called tunnelling ef- fect, by which cylindrical holes with minimal tapering together with a relatively small heat affected zone can be achieved. The mechanism and the drilling conditions to realize the tunnelling effect are analyzed and experimental evidences are provided.
A theoretical model was developed to describe blind hole profiles in Nd :YAG laser dril- ling. In most cases, the drilled holes resemble a spindle-like shape as is predicted by the theorctical model. Derived from the model, an interesting and useful phenomenon: the so-called tunnelling ef- fect, by which cylindrical holes with minimal tapering together with a relatively small heat affected zone can be achieved. The mechanism and the drilling conditions to realize the tunnelling effect are analyzed and experimental evidences are provided.
