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 ...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.展开更多
文摘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.
