Femtosecond Time-Resolved Electron Diffraction: Applications for Laser Melting and Ablation

HADA Masaki

doi:10.2184/lsj.43.3_149

Bibliographic Information

Other Title

フェムト秒時間分解電子線回折法：融解及びアブレーション現象観測への応用
フェムトビョウジカンブンカイデンシセンカイセツホウ : ユウカイオヨビアブレーションゲンショウカンソクエノオウヨウ

Search this article

Description

Melting and ablation with an ultrashort laser pulse have been widely used for a variety of applications. The mechanisms of melting and ablation are strongly dependent on the material and photoexcitation levels. Using high peak power laser fluences induces nonthermal processes that involve nonthermal melting, cold ablation and plasma formation; however, thermal related processes are dominant at relatively a low laser fluence. In this paper, we summarize the laser melting and ablation processes from the viewpoint of time-resolved structural studies and introduce the development of a femtosecond timeresolved electron diffraction setup. We also show a time-resolved electron diffraction experiment to study the evolution of the ablation process that follows femtosecond 400-nm laser excitation in crystalline potassium iodide. Our results reveal fast electronic and localized structural changes that lead to the ejection of particles, reflecting the very nature of the strong repulsive forces at play.

Journal

The Review of Laser Engineering

The Review of Laser Engineering 43 (3), 149-, 2015

The Laser Society of Japan

Keywords

Details 詳細情報について

Export