Analysis of the laser-produced current impulse below the breakdown threshold in a homogeneous field
Analysis of the laser-produced current impulse below the breakdown threshold in a homogeneous field
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分析均匀场中激光产生的低于击穿阈值的电流脉冲
DOI：
10.1088/0022-3727/29/7/032
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
J. Chapelle
中科院分区：
文献类型：
--
作者：
N. Soulem;B. Held;J. Chapelle
结果表明，在远低于击穿阈值的平行板器件轴上，脉冲持续时间为17 ns的激光束在外电路中产生电流脉冲。基于雷默-肖克利定理的电信号分析，使人们能够估计在间隙中运动的电子的数量和它们的速度。结果表明，该速度由两部分组成：漂移速度取决于减小的静电场，漂移速度由电子的空间分布决定。即使是估计的，实验表明，在100 - 600托的压力范围内，当激光束穿过间隙时，负责产生电子的物理过程不仅仅是多光子跃迁。
It is shown that a laser beam (, ) of 17 ns pulse duration transversely directed on the axis of a parallel-plates device far below the breakdown threshold produces a current impulse in the external circuit. The analysis of the electrical signals, based on the Ramo - Shockley theorem, allows one to estimate the number of electrons moving in the gap and their velocity. It is shown that this velocity is characterized by two components: the drift velocity depending on the reduced electrostatic field and the other resulting from the spatial distribution of electrons. Even if is estimated, experiments show that, for pressures lying in the range 100 - 600 Torr, the physical processes responsible for the production of electrons when the laser beam crosses the gap are not only multiphoton transitions.