Abstract
Recently, ultrafast laser-material interaction has become a research focus. This paper experimentally investigated multiple-pulse drilling on titanium alloy in picosecond laser processing. Ablation morphology, quality and feature sizes of drilled craters were investigated under different laser fluences and pulse numbers. Laser parameter experiments, SEM characterization and 3D profile measurement were performed to obtain the characteristics of drilled craters. Then, the relationship between laser fluence, pulse number and feature sizes was determined. Besides, the ablation mechanism, material removal rate for single pulse and ablation threshold of picosecond pulse laser on titanium alloy were analyzed. This research contributes to the theory and practice of titanium alloy micromachining with picosecond laser, which suggests that the craters with specific size and high material removal rate can be obtained.
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