Dynamics of plume and crater formation after action of ferntosecond laser pulse
Dynamics of plume and crater formation after action of ferntosecond laser pulse
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DOI：
10.1016/j.apsusc.2007.01.077
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发表时间：
2007-05-30
影响因子：
6.7
通讯作者：
Khokhov, V. A.
中科院分区：
文献类型：
--
作者：
Agranat, M. B.;Anisimov, S. I.;Khokhov, V. A.
利用显微干涉方法，首次实验研究了激光羽流从有散裂区域到无散裂区域的转变。当入射辐射的通量Fin，超过“蒸发”(F-Inc)(EV)的阈值时，就会发生跃迁。先前已经表明，散裂层是在高于烧蚀阈值(F-INC)(ABL)的通量下形成的。因此，层裂存在于(F-Inc)(ABL)<；F-Inc<；(F-Inc)(EV)范围内。激光光束在光束的轴上具有最大通量(F-Inc)(C)。阈值F-EV将具有不同形态的两种情况分开：(1)如果F-ABL<；F-c<；F-EV，则完整的外壳覆盖陨石坑；(2)如果F-c>；F-EV，外壳在中心有一个孔(如火山喷口)。(C)2007 Elsevier B.V.保留所有权利。
Using microinterferometric method, a transition in laser plume from the regime with spallation to the regime without spallation is experimentally studied for the first time. The transition occurs when the fluence Fin, of incident radiation exceeds a threshold of "evaporation" (F-inc)(ev). It has been shown previously that the spallation layer is formed at fluence above the ablation threshold (F-inc)(abl). Thus the spallation exists within the limits (F-inc)(abl) < F-inc < (F-inc)(ev). A laser beam has a maximum fluence (F-inc)(c) on the axis of the beam. The threshold F-ev separates two cases with qualitatively different morphology: (1) with unbroken shell covering the crater entirely if F-abl < F-c < F-ev, and (2) with the shell having an aperture in the center (like the volcano muzzle) if F-c > F-ev. (C) 2007 Elsevier B.V. All rights reserved.