摘要
当入射激光的波长、辐照时间、平均功率密度保持相同的条件下，改变激光的时。空结构会产生不同的破坏模式，在上述激光基本参数不变时，如何合理选择激光的时。空分布以便达到最佳的破坏效果，这类问题可称之为激光破坏机理研究中的反问题。迄今为止，人们对这一“反问题”的研究甚少。本文利用非高斯空间分布激光辐照黄铜薄片材料，产生了一种特殊的破坏模式──反冲塞效应，并对此进行了较系统的实验与理论分析，激光破坏反问题的提出和初步探索是研究激光破坏机理的一个新概念和新进展。
This paper reveals a new kind of pulsed laser-induced failure mode,which wasexperimentally observed in thin target plate of brass and was named as reverse plugging effect (RPE)by the authors previously.In the test,a pulsed Nd:Glaiss laser beam is used withduration 0.3ms,total energy 30-40J, spot size 2-5mm and particuldrily with a spdtialshape of non-Gaussian type,Theoretical analyses are presented for this newly-observed phenomenon,The present investigation confirms that the laser-induced failurfe mode couldbe altered essentially by changing temporal and shapes of the laser beam when its average parameters such as wavelength,intensity, duration and spot size remain unchanged ,If it isthe case,how are the temporal and spatial structures of the laser beam selected properly to cause the target plate damaged in most favorable way?This question might be called an inverse problem raised in the study of laser-induced failure mechanism and seems worth further exploration.
出处
《力学学报》
EI
CSCD
北大核心
1995年第3期277-293,共17页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家863高技术激光技术领域和国家自然科学基金
关键词
破坏机理
反冲塞效应
激光辐照
laser-induced failure, reverse plugging,non-Gaussian laser,inverse ploblem
