Effects of interpulse and intrapulse shaping during laser percussion drilling

David K. Y. Low; Lin Li

doi:10.1117/12.456852

25 February 2002 Effects of interpulse and intrapulse shaping during laser percussion drilling

David K. Y. Low, Lin Li

Proceedings Volume 4426, Second International Symposium on Laser Precision Microfabrication; (2002) https://doi.org/10.1117/12.456852
Event: Second International Symposium on Laser Precision Micromachining, 2001, Singapore, Singapore

Abstract

An advent advocate of laser percussion drilling is the aerospace industry, where billions of holes have been laser drilled in turbine components, for the provision of effusion cooling holes, which consequently allowed higher combustion temperatures and engine efficiencies. However, in order for other industries to capitalize on the benefits of laser drilling, greater flexibility is required in producing the desired hole geometries. In this study, the effects of intra-pulse and inter-pulse shaping are investigated in terms of hole geometry control. While intra-pulse shaping involves temporally shaping within an individual laser pulse and repeatedly using the shaped pulse throughout the pulse train, inter-pulse shaping is carried out by temporal pulse shaping the overall delivery pattern of a pulse train required to percussion drill a hole. Experiments were performed using a fiber-optic delivered Nd:YAG laser for the drilling of through-holes in stainless steel 304. The fundamental effects of intra- and inter-pulse shaping are also compared with percussion drilling with unshaped rectangular pulses and the normal delivery pattern (NDP). The work has shown that inter-pulse shaping is effective in reducing the hole taper during laser percussion drilling. This was chiefly attributed to the optimized laser pulse distribution as the beam propagates into the hole.

Citation Download Citation

David K. Y. Low and Lin Li "Effects of interpulse and intrapulse shaping during laser percussion drilling", Proc. SPIE 4426, Second International Symposium on Laser Precision Microfabrication, (25 February 2002); https://doi.org/10.1117/12.456852

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