Dynamics of plume and crater formation after action of ferntosecond laser pulse

被引：48
作者：
Agranat, M. B.
Anisimov, S. I.
Ashitkov, S. I.
Zhakhovskii, V. V.
Inogamov, N. A. [1 ]
Nishihara, K.
Petrov, Yu. V.
Fortov, V. E.
Khokhov, V. A.
机构：
[1] Russian Acad Sci, LD Landau Inst Theoret Phys, Chernogolovka 142432, Russia
[2] RAS, Joint Inst High Temp, Moscow 125412, Russia
[3] Inst Laser Engn, Suita, Osaka 5650871, Japan
来源：
APPLIED SURFACE SCIENCE | 2007年 / 253卷 / 15期
基金：
俄罗斯基础研究基金会;
关键词：
ultrashort laser ablation; pump-probe; molecular dynamics; spallation;
D O I：
10.1016/j.apsusc.2007.01.077
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：6276 / 6282
页数：7
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