Coherent x-ray generation at 2.7nm using 25fs laser pulses
Coherent x-ray generation at 2.7nm using 25fs laser pulses
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使用 25fs 激光脉冲产生 2.7nm 相干 X 射线
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Murnane
中科院分区：
文献类型：
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作者：
A. Rundquist;Z. Chang;Haiwen Wang;I. Christov;H. Kapteyn;M. Murnane
我们首次证明了使用25fs的驱动脉冲可以产生波长为2.7nm的相干软X射线脉冲。氦中的高次谐波产生被用来产生飞秒X射线谐波，其表现出高达221阶的离散的单个阶数，随后是延伸到至少299阶的未分辨谐波的连续体，对应于2.7nm的波长或450eV的能量。He的大电离势，加上驱动场的超短性质，导致谐波平台的急剧扩展，比以前观察到的多约200个数量级。我们也获得了很好的协议与理论预测。
We demonstrate for the first time that coherent soft-x-ray pulses at wavelengths of 2.7nm can be generated using 25fs driving pulses. High-order harmonic generation in He is used to produce the femtosecond x-ray harmonics, which exhibit discrete individual orders up to 221, followed by a continuum of unresolved harmonics which extend up to at least the 299th order, corresponding to a wavelength of 2.7nm, or an energy of 450eV. The large ionization potential of He, together with the ultrashort nature of the driving field, results in this dramatic extension of the harmonic plateau, by approximately 200 orders more than has been observed previously. We also obtain excellent agreement with theoretical predictions.