Interferometric diagnostics of femtosecond laser microplasma in gases
Interferometric diagnostics of femtosecond laser microplasma in gases
复制标题
气体中飞秒激光微等离子体的干涉诊断
DOI：
10.3103/s1541308x12020021
复制
发表时间：
2012
影响因子：
1.4
通讯作者：
V. Strelkov
中科院分区：
文献类型：
--
作者：
V. Bukin;S. Garnov;A. A. Malyutin;V. Strelkov
已经通过实验研究了在气态介质中由于其在紧密聚焦的飞秒激光脉冲下的光学击穿而形成的激光等离子体。选择泵浦探针微干涉测量法来执行等离子体的空间和时间诊断。获得了激光等离子体电子密度的时间依赖性。结果表明，在不同压力（1 至 10 atm 范围内）下不同气体（空气、氮气、氩气和氦气）的击穿中，当激光照射结束时，电子浓度在~1 ps 内持续增加。这种效应与强飞秒激光脉冲与物质相互作用时形成的热电子对等离子体的碰撞电离有关。给出了后电离过程的理论模拟结果。
The laser plasma formed in gaseous media due to their optical breakdown under tightly focused femtosecond laser pulses has been experimentally investigated. Pump-probemicrointerferometry is chosen to perform spatial and temporal diagnostics of the plasma. Time dependences of the laser plasma electron density are obtained. It is shown that in breakdown of different gases (air, nitrogen, argon, and helium) at different pressures (in the range from 1 to 10 atm) the electron concentration continues to increase during ∼1 ps when the laser irradiation is over. This effect is related to the impact ionization of the plasma by the hot electrons formed in interaction of intense femtosecond laser pulses with matter. The results of theoretical simulation of the post-ionization processes are presented.
影响因子：
8.6
作者：
TAJIMA, T;DAWSON, JM
通讯作者：
DAWSON, JM
影响因子：
64.8
作者：
Mangles, SPD;Murphy, CD;Krushelnick, K
通讯作者：
Krushelnick, K