Destruction of a solid film under the action of ultrashort laser pulse
Destruction of a solid film under the action of ultrashort laser pulse
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DOI：
10.1134/1.1600815
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发表时间：
2003-06
期刊：
影响因子：
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通讯作者：
S. Anisimov;V. Zhakhovskiĭ;V. Zhakhovskiĭ;N. Inogamov;K. Nishihara;A. Oparin;Y. Petrov
中科院分区：
文献类型：
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作者：
S. Anisimov;V. Zhakhovskiĭ;V. Zhakhovskiĭ;N. Inogamov;K. Nishihara;A. Oparin;Y. Petrov
对飞秒激光脉冲加热的晶体薄膜的破坏进行了分子动力学（MD）模拟。假设加热是瞬时的，因为在脉冲期间材料没有时间移动。薄膜破坏是由卸载波的相互作用引起的。它可以被视为一个更复杂的过程模型，即在加热后该层保持固态的情况下，从大块目标中分离出薄表面层。研究发现，由于拉伸应变和残余应力的强各向异性，晶序被破坏，导致与靶材分离的层的两部分。晶格拉伸和各向异性应力的形成是由于受热晶格的膨胀造成的。
Molecular-dynamics (MD) simulation of the destruction of a crystal film heated by a femtosecond laser pulse was carried out. Heating is assumed to be instantaneous, because there is no time for the material to be displaced during the pulse. Film destruction is caused by the interaction of unloading waves. It can be considered as a model of a more complex process of splitting out of a thin surface layer from a massive target in the case where the layer remains solid after heating. It was found that the crystal order is broken due to the stretching strains and to the strong anisotropy of residual stress, resulting in a bipartition of the layer separating from the target. The lattice stretching and the formation of anisotropic stresses are due to the expansion of a heated lattice.