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文章作者使用60 fs倍频高对比度激光脉冲聚焦到Cu膜上,发现与基频激光脉冲相比,从激光到KαX射线的能量转化效率(ηk)明显增强.ηk对激光脉冲非线性啁啾上升沿呈现出很强的依赖性,它在激光为100fs负啁啾脉冲时达到最大值.实验表明对超热电子有效的加热导致了ηk的增强.这说明由于能够驱动真空加热机制来增强超热电子的产生,高对比度激光已成为优化ηk的有效工具.这些结果发表在Phys.Rev.Lett.,2008,100:045004上.
The author focused on a Cu film using a 60fs doubled, high contrast laser pulse and found that the energy conversion efficiency (ηk) from laser to Kα X-ray was significantly higher than that of the fundamental laser pulse. The nonlinear chirp rise of ηk to laser pulse Along with a strong dependency, which reaches its maximum when the laser is a 100 fs negative chirped pulse. Experiments show that efficient heating of superheated electrons leads to an increase of ηk, which shows that the increase of ηk due to the ability to drive the vacuum heating mechanism to enhance the superheat Electron generation, high-contrast lasers have become an efficient tool for optimizing ηk. These results are published in Phys. Rev. Lett., 2008, 100: 045004.