• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>High-Power Laser Ablation VI pt.1 >On ultra-short laser pulse induced instabilities at the surface of non-metallic solids
【24h】

On ultra-short laser pulse induced instabilities at the surface of non-metallic solids

机译：超短激光脉冲在非金属固体表面引起的不稳定性

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The impact of intense femtosecond laser pulses on dielectric targets results in a non-equilibrium state of the surface. We consider the influence of this instability on ablation and surface relaxation phenomena. Important consequences of the laser-material coupling and energy dissipation are addressed such as transient and permanent modification of the surface. From experiments on ablation products kinetics, Coulomb explosion upon multiphoton surface ionization has been established as the initial mechanism for desorption of fast positive ions from dielectric surfaces. We refer to the role of surface defects responsible for ion yield enhancement and the nature of defects by detecting laser induced fluorescence. Additionally, observations point to a set-in of a thermal emission process at higher laser intensity. Investigating the dynamics of particle emission, we find ultra-short timescales for the coherence of electronic excitation and energy relaxation via transient phases, the latter related to the coupling strength of the various solids. The surface morphology after ablation is modified, with regular nano- and micro-structures of features originated from self-organization of surface instabilities.
机译：飞秒强激光脉冲对电介质靶的影响导致表面处于非平衡状态。我们考虑了这种不稳定性对消融和表面松弛现象的影响。解决了激光材料耦合和能量耗散的重要后果，例如表面的瞬时和永久性修改。从烧蚀产物动力学的实验中，多光子表面电离后的库仑爆炸已被确立为从电介质表面解吸快速正离子的初始机制。我们通过检测激光诱导的荧光来指负责提高离子产量的表面缺陷的作用以及缺陷的性质。此外，观察结果表明在较高的激光强度下会出现热发射过程。调查粒子发射的动力学，我们发现超短时标通过瞬态相实现电子激发和能量弛豫的相干性，后者与各种固体的耦合强度有关。烧蚀后的表面形态被修改，具有规则的纳米和微观结构特征，这些特征源自表面不稳定性的自组织。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号