Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces
Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces
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DOI：
10.1103/physrevlett.99.085001
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发表时间：
2007-08-24
影响因子：
8.6
通讯作者：
Zepf, M.
中科院分区：
文献类型：
--
作者：
Dromey, B.;Kar, S.;Zepf, M.
提出了从拍瓦级激光-固体相互作用延伸至 3.3 A、3.8 keV（n 级 > 3200）的 X 射线谐波辐射的第一个证据，在多 keV 能量下表现出相对论极限效率缩放（eta 类似于 n(-2.5)-n(-3)）。这种缩放比例保持到类似于 8(1/2)gamma(3) 的最大阶数 n(RO)，其中 gamma 是相对论性洛伦兹因子，在该因子之上，观察到强度相关效率翻转的第一个证据。所生成谐波的相干性质通过高度定向的光束发射得到证明，对于光子能量 h nu > 1 keV，发现其锥角类似于 4 度，明显小于入射激光锥角（20 度）。
The first evidence of x-ray harmonic radiation extending to 3.3 A, 3.8 keV (order n > 3200) from petawatt class laser-solid interactions is presented, exhibiting relativistic limit efficiency scaling (eta similar to n(-2.5)-n(-3)) at multi-keV energies. This scaling holds up to a maximum order, n(RO)similar to 8(1/2)gamma(3), where gamma is the relativistic Lorentz factor, above which the first evidence of an intensity dependent efficiency rollover is observed. The coherent nature of the generated harmonics is demonstrated by the highly directional beamed emission, which for photon energy h nu > 1 keV is found to be into a cone angle similar to 4 degrees, significantly less than that of the incident laser cone (20 degrees).