Abstract

The laser initiation threshold energy densities (the laser sensitivity) of pentaerythritol tetranitrate (PETN) containing a nanostructured zinc oxide powder doped with silver (ZnO:Ag) are studied in the article. The second harmonic radiation of a pulsed Nd:YAG laser with a wavelength of 532 nm and a CW laser diode with a wavelength of 450 nm are used for initiation. The ZnO:Ag nanopowder can potentially provide photoinitiation of PETN by the photochemical mechanism. The initiation thresholds via pulsed laser initiation are compared with compositions of PETN and gold nanoparticles, which have similar optical characteristics but are chemically inert. The absorption spectra of materials in the UV, visible, and near-IR spectral regions are studied. The threshold of the laser initiation of the explosion of the PETN–ZnO:Ag composite by pulsed radiation is lower than one-third of the threshold of initiation of the PETN-nanogold composite, which has similar values of optical density. The addition of 1% mass of ZnO:Ag for the first time makes it possible to initiate PETN reliably (without failures) by the radiation of a low-power visible laser diode. The results and their comparison with the published data allow us to make a reasonable assumption on the contribution of the photochemical stages to the laser initiation of the PETN–ZnO:Ag composite by visible laser radiation.

中文翻译：

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添加ZnO:Ag纳米粉控制季戊四醇四硝酸酯对可见激光辐射的敏感性

摘要

本文研究了含有银掺杂纳米结构氧化锌粉末（ZnO:Ag）的季戊四醇四硝酸酯（PETN）的激光起爆阈值能量密度（激光灵敏度）。使用波长为 532 nm 的脉冲 Nd:YAG 激光器和波长为 450 nm 的 CW 激光二极管的二次谐波辐射来引发。ZnO:Ag纳米粉末可以通过光化学机制提供PETN的光引发作用。将脉冲激光引发的引发阈值与PETN和金纳米粒子的组合物进行比较，后者具有相似的光学特性，但具有化学惰性。研究了材料在紫外、可见和近红外光谱区域的吸收光谱。脉冲辐射激光引发PETN-ZnO:Ag复合材料爆炸的阈值低于具有相似光密度值的PETN-纳米金复合材料爆炸阈值的三分之一。首次添加 1% 质量的 ZnO:Ag 使得通过低功率可见激光二极管的辐射可靠地（无故障）引发 PETN 成为可能。结果及其与已发表数据的比较使我们能够对光化学阶段对可见激光辐射引发 PETN-ZnO:Ag 复合材料的激光引发的贡献做出合理的假设。