Phys.org July 8, 2024
GHz burst-mode femtosecond (fs) laser provides distinct characteristics in materials processing as compared with the conventional irradiation scheme of fs laser (single-pulse mode). Researchers in Japan used the moderate pulse interval of 205 ps in the burst pulse for high-quality and high-efficiency micromachining of single crystalline sapphire by laser induced plasma assisted ablation (LIPAA). The preceding pulses in the burst generated plasma by ablation of copper placed behind the sapphire substrate, which interacted with the subsequent pulses to induce ablation at the rear surface of sapphire substrates. The ablation quality, efficiency, and the fabrication resolution were greatly improved compared to the other schemes including single-pulse mode fs laser direct ablation, single-pulse mode fs-LIPAA, and nanosecond-LIPAA… read more. Open Access TECHNICAL ARTICLE
Schematic illustrations of (a) experimental setup for the GHz burst LIPAA process… Credit: Opto-Electron Sci 3, 230053 (2024)