激光冲击波的幅度和时间特性的理论研究

Theoretically study on magnitude and time characteristics

理论上讨论了激光辐照形成的高压冲击波的幅度和时间特性。对约束结构 ,认为等离子体的横向膨胀对冲击波产生重要的影响。计算表明 ,横向膨胀比纵向膨胀缓慢得多 ,但同样大小的横向线度增长对冲击波强度的衰减却远远强于纵向膨胀的作用。这意味着 ,等离子体的横向膨胀不能忽略。

In this paper,the magnitude and time characteristics of laser induced shock waves are theoretically studied.For unconfined framing,the conclusion obtained here concurs with the common results.However,in respect to confined geometry it could be considered,on experimental data,that lateral expansion of the laser induced plasma should have significant effects to the properties of the high generated shocks.And our expected calculating results indicate the coincident conclusion,that is ,though transverse distension is far too more slowly than longitudinal inflation,the former of same proportions weakens much more saliently the magnitude of the shock waves than the later does.Then conclusion can be draw,that the inevitable lateral expansion of the laser produced plasma impacts so efficiently on the attenuation of the shock waves that its behavior should be regarded as a substantial work.