Drilling of narrow holes in metals by millisecond pulses of Nd : YAG lasers

摘要

Results of the experiments on drilling of holes with small diameter in different metals by single pulses of laser radiation of millisecond duration are given. It is found out that formation of holes with diameter less than 0.1 mm and length more than 2 mm in steels is possible due to the effect of self-concentration of a heat source on the bottom of a vapor-gas channel that can be realized adjusting the time profile (shape) of laser pulses and spatial parameters of radiation. Pulse shape can be also optimized to obtain the deep melting mode without ejection of melt out of heated spot. [References: 6]