Transparency measurement of lithium fluoride under laser-driven accelerating shock loading
Transparency measurement of lithium fluoride under laser-driven accelerating shock loading
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激光驱动加速冲击载荷下氟化锂透明度测量
DOI：
10.1063/5.0003869
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发表时间：
2020-07
影响因子：
3.2
通讯作者：
Zhebin Wang
中科院分区：
文献类型：
--
作者：
Xiaoxi Duan;Chen Zhang;Zanyang Guan;Liang Sun;Xiaoshi Peng;Hao Liu;Weiming Yang;Yulong Li;Huan Zhang;Qing Ye;Jiamin Yang;Shaoen Jiang;Zhebin Wang
如果使用光学探针，透射率限制是使用窗口进行冲击实验的最重要障碍之一。在本文中，我们重点关注广泛使用的窗口材料氟化锂 (LiF)，并研究其在激光诱导冲击压缩条件下的光学响应。长脉冲激光的形状可产生连续加速的冲击波，通过 LiF 窗口在 100–400 GPa 范围内传播。测量的光传输随冲击压力的变化表明，即使冲击应力高于 350 GPa，LiF 窗口仍保持透明，并在约 400 GPa 时转变为完全不透明状态。与之前报道的结果相比，本实验表现出明显更高的冲击应力，导致 LiF 窗口失去透明度。实验结果的差异被认为是由于不同实验平台上典型时间尺度的冲击厚度差异造成的。同时，我们的实验数据与之前的从头计算之间存在差异的可能原因可以通过电子和离子之间的热弛豫效应或理论计算中吸收系数的高估来暗示。这种更高的透射率限制的发现对于在未来的冲击压缩实验中使用 LiF 作为窗口材料的研究人员来说可能很重要，特别是在激光平台上。
Transmissibility limitation is one of the most important barriers in the use of windows for shock experiments if optical probes are used. In this article, we focus on the widely used window material lithium fluoride (LiF) and investigate its optical response under laser-induced shock-compression conditions. A long-pulse laser is shaped to create a continuous accelerating shock wave propagating through the LiF window in the range of 100–400 GPa. The variation of measured optical transmission with shock pressure shows that the LiF window stays transparent even when the shock stress is higher than 350 GPa and transforms to a total opaque state at about 400 GPa. The present experiment exhibits an obviously higher shock stress for LiF windows to lose transparency compared with previously reported results. The discrepancy in experimental results is considered to be due to the difference in shock thickness for a typical time scale at different experimental platforms. Meanwhile, the possible reasons for the discrepancy between our experimental data and the previous ab initio calculations can be suggested by the effect of thermal relaxation between electrons and ions or the overestimation of the absorption coefficient in theoretical calculations. This finding of higher transmissibility limitation may be of importance to researchers who use LiF as a window material in future shock-compression experiments, especially at the laser platform.
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