Ablation enhancement by defocused irradiation assisted femtosecond laser fabrication of stainless alloy

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2018,（1）
• 页码范围: 53-56
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201816.011401

摘要

We evaluate the effects of the holes geometry drilled by a femtosecond laser on a stainless alloy with various defocused irradiation time,which ranges from 0 min to 1 h.The laser ablation efficiency is increased by a factor of 3 when the irradiation time is elevated from 0 to 30 min.Also,the morphology of the hole is observed by a scanning electron microscope,where the result indicates that the defocused irradiation time has a significant influence on the morphology changes.The reason for such changes is discussed based on the pretreatment effect and the confined plasma plume.As an application example,the microchannel is fabricated by a femtosecond laser combined with the defocused irradiation to demonstrate the advantage of the proposed method in fabricating functional structures.