Extended lifetime of high density plasma filament generated by a dual femtosecond-nanosecond laser pulse in air

被引：39
|
作者：
Papeer, J. [1 ]
Botton, M. [1 ]
Gordon, D. [2 ]
Sprangle, P. [2 ]
Zigler, A. [1 ]
Henis, Z. [1 ]
机构：
[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
[2] Naval Res Lab, Plasma Div, Washington, DC 20375 USA
来源：
NEW JOURNAL OF PHYSICS | 2014年 / 16卷
关键词：
femtosecond filamentation; plasma filaments; high power lasers; air plasma; laser plasma interaction; TRANSPARENT MEDIA;
D O I：
10.1088/1367-2630/16/12/123046
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A substantially extended lifetime of a high-density plasma channel generated in the wake of an intense femtosecond pulse propagating in air is experimentally demonstrated. Free electron density above 10(15) cm(-3) in the formed plasma filament is measured to be sustained for more than 30 ns. This high-density plasma lifetime prolongation of more than one order of magnitude is achieved by properly timed irradiation of the filament with a relatively low-intensity nanosecond laser pulse, in comparison with a filament without such irradiation. The experimental results are in good agreement with our theoretical model that follows the evolution of the temperature and density of various molecules, atoms, and ion species. The results point to the possibility of generating extremely long time duration, stable high-density plasma filaments in air.
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页数：10
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