Ultrahigh-contrast kilojoule-class petawatt LFEX laser using a plasma mirror
Ultrahigh-contrast kilojoule-class petawatt LFEX laser using a plasma mirror
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DOI：
10.1364/ao.55.006850
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发表时间：
2016-09
期刊：
影响因子：
1.9
通讯作者：
Y. Arikawa;S. Kojima;A. Morace;S. Sakata;T. Gawa;Y. Taguchi;Y. Abe;Zhe Zhang;X. Vaisseau
中科院分区：
文献类型：
--
作者：
Y. Arikawa;S. Kojima;A. Morace;S. Sakata;T. Gawa;Y. Taguchi;Y. Abe;Zhe Zhang;X. Vaisseau
用于快速点火实验 (LFEX) 激光系统的千焦级拍瓦激光器展示了超过 1011 的激光脉冲对比度 [J.物理。 IV France133, 81 (2006)10.1051/jp4:2006133016]通过实施 2 英寸等离子镜。高达 1.2 kJ 的激光束以 1.5 ps 的脉冲持续时间撞击等离子镜，被反射并聚焦到目标上，焦点不会出现明显变形。等离子镜的透射光显示其在主峰前 2 ps 处具有高反射率。主峰前 1 ns 处目标处的估计激光脉冲对比度为 1011。通过光学干涉测量诊断没有观察到预形成的等离子体，但在没有等离子体镜的实验中清楚地观察到前等离子体。高能质子由 0.1 μm 厚的 CH 薄膜产生，具有出色的脉冲对比度。该技术是增强 LFEX 激光系统在快速点火实验中性能的有前途的方法。
Laser pulse contrast exceeding 1011 was demonstrated on a kilojoule-class petawatt laser for fast ignition experiments (LFEX) laser system [J. Phys. IV France133, 81 (2006)10.1051/jp4:2006133016] by implementing a 2 in. plasma mirror. Laser beams of up to 1.2 kJ striking the plasma mirror with a pulse duration of 1.5 ps were reflected and focused onto a target without significant distortions in the focal spot. Transmitted light from the plasma mirror reveals that it has a high reflectivity 2 ps before the main peak. The estimated laser pulse contrast at the target was 1011 at 1 ns before the main peak. No preformed plasma was observed with an optical interferometry diagnostics, but in the experiment without a plasma mirror a preplasma was clearly observed. The energetic proton was generated from a 0.1 μm thick CH film showing excellent pulse contrast. This technique constitutes a promising method to enhance the LFEX laser system performance in fast ignition experiments.