[19p-PA2-1~9] 3.7 Laser processing

[19p-PA2-7] Analysis of wide-range and continuous pulse-duration dependence of the craters in ultrashort-pulse laser drilling of metals

〇Dai Yoshitomi¹, Hideyuki Takada¹, Aiko Narazaki¹, Kenji Torizuka¹, Yohei Kobayashi² (1.AIST, 2.ISSP, Univ. Tokyo)

Keywords:laser, laser processing, femtosecond

We investigated wide-range and continuous pulse-duration dependence of the volume of the craters prepared with ultrashort-pulse laser drilling on metals with different thermal conductivity. The obtained dependence revealed a minimal point and their position depended on thermal conductivity of the metals. It suggests that the minimal point bounds two regions, long-pulse thermal region and short-pulse less theramal region.