Article,

Model of the final borehole geometry for helical laser drilling

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Advanced Optical Technologies, 7 (3): 183-188 (2018)
DOI: https://doi.org/10.1515/aot-2018-0006

Abstract

A model for predicting the borehole geometry for laser drilling is presented based on the calculation of a surface of constant absorbed fluence. It is applicable to helical drilling of through-holes with ultrashort laser pulses. The threshold fluence describing the borehole surface is fitted for best agreement with experimental data in the form of cross-sections of through-holes of different shapes and sizes in stainless steel samples. The fitted value is similar to ablation threshold fluence values reported for laser ablation models.

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