Mechanisms of ultrafast GHz burst fs laser ablation

• DOI: 10.1126/sciadv.adf6397
• Publication Date: 2023-03-22T18:01:34Z
• Authors: Minok Park; Yueran Gu; Xianglei Mao; Costas P. Grigoro...; Vassilia Zorba
• Keywords: Laser Ablation; Recoil

Gigahertz (GHz) femtosecond (fs) lasers have opened possibilities for enhancing and controlling the laser machining quality to engineer physicochemical properties of materials. However, fundamental understanding laser-material interactions by GHz fs has remained unsolved due complexity associated ablation dynamics. Here, we study dynamics copper (Cu) bursts using in situ multimodal diagnostics, time-resolved scattering imaging, emission spectroscopy. A combination probing techniques reveals that rapidly remove molten Cu from irradiated spot recoil pressure exerted following pulses. Material ejection essentially stops right after burst irradiation limited amount remnant matter, combined with suppressed heat conduction into target material. Our work provides insights complex mechanisms incurred bursts, which are critical selecting optimal conditions cross-cutting processing, micro/nano-fabrication, spectroscopy applications.