Advances in capillary discharge soft x-ray laser research
Advances in capillary discharge soft x-ray laser research
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毛细管放电软X射线激光研究进展
DOI：
10.1117/12.450574
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
V. Shlyaptsev
中科院分区：
文献类型：
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作者：
J. Rocca;J. Chilla;S. Sakadžić;Abdur Rahman;Jorge Filevich Chamatropulos;E. Jankowska;E. Hammarsten;B. Luther;H. Kapteyn;M. Murnane;V. Shlyaptsev
本文概述了科罗拉多州立大学最近的软 X 射线激光研究。与毛细管放电源开发相关的进展包括在高功率毛细管放电产生的等离子体柱中观察到类镍镉的 13.2 纳米激光线的发射。这一结果表明，有可能将毛细管放电激光器的波长扩展到更短的波长。在另一种产生相干软 X 射线辐射的方法中，我们分析了在放电泵浦放大器中放大高次谐波脉冲的可能性。与加州大学伯克利分校和巴黎南大学研究小组合作开展的工作中，已经充分表征的 46.9 纳米类氖氩激光器的研究通过新的空间相干性和激光波前测量得到了扩展。在应用领域，我们将之前使用台式激光器进行等离子体干涉测量的结果扩展到等离子体密度高达 0.9 x 1021 cm-3。由 Nd-YAG 激光器在 1 x 1011 W cm-2 和 7 x 1012 W cm-2 之间的强度产生的等离子体的软 X 射线激光干涉图序列显示了凹电子密度分布的发展和演变。利用软 X 射线干涉测量法对这种现象进行详细绘制，证明了紧凑型软 X 射线激光器在增进对高密度等离子体的理解方面的有用性。
This paper gives an overview of recent soft x-ray laser research at Colorado State University. Progress related to capillary discharge source development includes the observation of emission from the 13.2-nm laser line of Nickel-like Cd in a plasma column generated by a high power capillary discharge. This result suggests it might be possible to extend capillary discharge lasers to significantly shorter wavelengths. In another approach to the generation of coherent soft x-ray radiation we analyzed the possibility of amplifying high order harmonic pulses in a discharge-pumped amplifier. The study of the already well- characterized 46.9-nm Ne-like Ar laser was extended with new spatial coherence and laser wavefront measurements, in work conducted in collaboration with U. California Berkeley and U. of Paris-Sud groups. In the field of applications, we have extended our previous results of plasma interferometry with a tabletop laser to plasma densities up to 0.9 x 1021 cm-3. Sequences of soft x-ray laser interferograms of plasmas generated by a Nd-YAG laser at intensities between 1 x 1011 W cm-2 and 7 x 1012 W cm-2 show the development and evolution of a concave electron density profile. The detailed mapping of this phenomenon with soft x-ray interferometry exemplifies the usefulness of compact soft x-ray lasers in increasing the understanding of high density plasmas.