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arXiv 0712.0586physics.plasm-phphysics.atm-clus
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强短脉冲laser作用下团簇纳米等离子体的谐波辐射

Harmonic emission from cluster nanoplasmas subject to intense short laser pulses

S. V. Popruzhenko, M. Kundu, D. F. Zaretsky, D. Bauer

摘要:

研究了短脉冲强红外激光作用下团簇纳米等离子体的谐波辐射。在以前的出版物[M。Kundu等人,Phys. Rev. A 76,033201(2007)],我们报道了粒子单元模拟结果,其显示当电离和膨胀团簇的Mie等离子体频率与相应的谐波频率共振时,低阶谐波的共振增强。同时,我们发现,高次谐波几乎不存在于光谱中,即使在高强度。目前的文件是集中在分析建模的过程中。我们发现,由于非线性共振的动力学随机性抑制高次谐波的发射。

英文摘要:

Harmonic emission from cluster nanoplasmas subject to short intense infrared laser pulses is studied. In a previous publication [M. Kundu et al., Phys. Rev. A 76, 033201 (2007)] we reported particle-in-cell simulation results showing resonant enhancements of low-order harmonics when the Mie plasma frequency of the ionizing and expanding cluster resonates with the respective harmonic frequency. Simultaneously we found that high-order harmonics were barely present in the spectrum, even at high intensities. The current paper is focused on the analytical modeling of the process. We show that dynamical stochasticity owing to nonlinear resonance inhibits the emission of high order harmonics.

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