laser -团簇相互作用中的非线性共振吸收
Nonlinear resonance absorption in laser-cluster interaction
摘要：
已知稀有气体或金属团簇非常有效地吸收激光能量。在团簇膨胀时，米氏等离子体频率可以变得等于激光频率。这种线性谐振已经很好地研究了实验和理论采用泵探测计划。在这项工作中，我们专注于几个周期制度或早期阶段的集群动力学的线性共振不满足，但仍然有效的吸收激光能量持续。通过从粒子模拟结果中恢复随时间变化的振荡频率，我们发现非线性共振是近红外激光驱动团簇的外电离和能量吸收的主要机制。
英文摘要：
Rare gas or metal clusters are known to absorb laser energy very efficiently. Upon cluster expansion the Mie plasma frequency may become equal to the laser frequency. This linear resonance has been well studied both experimentally and theoretically employing pump probe schemes. In this work we focus on the few-cycle regime or the early stage of the cluster dynamics where linear resonance is not met but nevertheless efficient absorption of laser energy persists. By retrieving time-dependent oscillator frequencies from particle-in-cell simulation results, we show that nonlinear resonance is the dominant mechanism behind outer ionization and energy absorption in near infrared laser-driven clusters.
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