A study of the initial process of the femtosecond laser ablation by using the soft x-ray laser probe.

2015 Fiscal Year Final Research Report

• Project/Area Number: 25390103
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: HASEGAWA NOBORU 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究職 (50360409)
• Co-Investigator(Kenkyū-buntansha): NISHIKINO MASAHARU 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門・量子ビーム応用研究センター, 研究副主幹 (70370450) ; ISHINO MASAHIKO 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門・量子ビーム応用研究センター, 研究副主幹 (80360410) ; NANBA SHINICHI 広島大学, 工学(系)研究科(研究院), 教授 (00343294) ; OHNISHI NAOFUMI 東北大学, 工学研究科, 准教授 (20333859)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: フェムト秒レーザー / アブレーション / 軟Ｘ線レーザー / 干渉計測 / 時間分解計測 / 空間分解計測

Outline of Final Research Achievements

We have succeeded in observation of the details of the temporal evolution of the ablating surfaces induced the femto-second laser by using the shingle-shot soft x-ray laser probe system. The ablation front with a solid or the melted surface and the expansion front with thin film structure were observed. Especially the sample of Au, the expansion front separated from the ablation front was thin, dense and smooth, therefore it works as the beam splitter for the soft x-rays at the time within 1 ns after the laser irradiation. The surface roughness of expansion front was better than a few nm, and the formation of nano-bubble structures were expected below the ablation front. In addition we have observed the result of the theoretical simulation for the femtosecond ablation process within 100 ps by using the molecular dynamics (MD) simulation.

Free Research Field

プラズマ物理