Compact gain-saturated x-ray lasers down to 6.85 nm and amplification down to 5.85 nm
Compact gain-saturated x-ray lasers down to 6.85 nm and amplification down to 5.85 nm
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DOI：
10.1364/optica.5.000257
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发表时间：
2018-03-20
期刊：
影响因子：
10.4
通讯作者：
Rocca, Jorge J.
中科院分区：
文献类型：
--
作者：
Rockwood, Alex;Wang, Yong;Rocca, Jorge J.
基于等离子体的x射线激光允许在紧凑的设施中进行单发纳米级成像和其他需要每个脉冲大量光子的实验。然而，紧凑型重复发射的增益饱和X射线激光器的波长被限制在波长=8.85 nm以上。在这里，我们通过优化的预脉冲产生的等离子体中的类镍Gd离子的瞬时行波激发，然后用强的亚皮秒泵浦脉冲进行快速加热，将它们的射程扩展到6.85 nm。等电子标度还在类镍Tb中产生了6.67 nm和6.11 nm的强激光，在类镍Dy中产生了6.41 nm和5.85 nm的放大。通过逐渐增加泵浦脉冲掠入射角以获得更高的等离子体密度，实现了对更短波长的缩放。实验证明，最佳掠入射角随着原子序数的增加而线性增加，从Z=42(Mo)的17°到Z=66(Dy)的43°。这一结果将使亚7 nm激光在紧凑的设施中得到应用。(C)2018年OSA开放获取出版协议条款下的美国光学学会
Plasma-based x-ray lasers allow single-shot nano-scale imaging and other experiments requiring a large number of photons per pulse to be conducted in compact facilities. However, compact repetitively fired gain-saturated x-ray lasers have been limited to wavelengths above lambda = 8.85 nm. Here we extend their range to lambda = 6.85 nm by transient traveling wave excitation of Ni-like Gd ions in a plasma created with an optimized pre-pulse followed by rapid heating with an intense sub-picosecond pump pulse. Isoelectronic scaling also produced strong lasing at 6.67 nm and 6.11 nm in Ni-like Tb and amplification at 6.41 nm and 5.85 nm in Ni-like Dy. This scaling to shorter wavelengths was obtained by progressively increasing the pump pulse grazing incidence angle to access increased plasma densities. We experimentally demonstrate that the optimum grazing incidence angle increases linearly with atomic number from 17 deg for Z = 42 (Mo) to 43 deg for Z = 66 (Dy). The results will enable applications of sub-7 nm lasers at compact facilities. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement