X-ray and fast ion generation from metal targets by femtosecond laser irradiation

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• 作者：Okano ; Yasuaki ; Kishimura ; Hiroaki ; Hironaka ; Yoichiro ; Nakamura ; Kazutaka G. ; Kondo ; Ken-ichi
• 关键词：Femtosecond laser ; X-ray generation ; Fast ions
• 刊名：Applied Surface Science
• 出版年：2002
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：September 30, 2002
• 卷：197-198
• 期：Complete
• 页码：281-284
• 文件大小：91.6 K

摘要

X-ray and fast ion generation has been studied by femtosecond laser irradiation (52fs, 790nm) on metal targets (copper and iron), where hard X-ray emission takes place at power density up to 10¹⁷W/cm². X-ray intensities and kinetic energy distributions of ions are observed as a function of the power density. The ion energy distributions for each target show several peak components, which are fast ions (high-energy component in keV range), and additional low-energy component (a few hundreds of eV). Average fast ion energies show a strong dependence on the power density, and are comparable to ponderomotive potential.