Dynamics of Laser‐Induced Breakdown in Gases
Dynamics of Laser‐Induced Breakdown in Gases
复制标题
激光诱导气体击穿的动力学
DOI：
10.1063/1.1709137
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发表时间：
1967
影响因子：
3.2
通讯作者：
M. Hercher
中科院分区：
文献类型：
--
作者：
M. Young;M. Hercher
分析了气体在激光作用下的击穿现象。以经典扩散理论为模型，电子被逆韧致辐射加速，直到它们有足够的能量去碰撞中性气体原子。在低于大气压的范围内，发现激光脉冲宽度与等离子体生长时间的关系是决定击穿阈值的主要因素。根据气体、压力和几何形状，损失发挥不同的重要作用。最初的电子通常被认为是来自杂质的多光子电离，虽然气体本身的多光子电离成为一个因素，在足够低的压力（高光子通量）。这些被用来证明一些理论假设和证实的理论结果。协议是好的。
The breakdown of gases under the influence of a laser beam is analyzed. Classical diffusion theory is taken as a model, with electrons accelerated by inverse bremsstrahlung until they have sufficient energy to ionize neutral gas atoms. Both diffusion and recombination are included as losses.For the rare gases in the range below atmospheric pressure it is found that the relation between the laser pulse duration and the plasma growth time is the primary factor which determines the breakdown threshold. The losses play roles of varying importance depending on gas, pressure, and geometry. The initial electrons are generally assumed to have come from multiphoton ionization of impurities, although multiphoton ionization of the gas itself becomes a factor at sufficiently low pressures (high photon fluxes).A number of experimental results is presented. These are used to justify some of the theoretical assumptions and to corroborate the results of the theory. The agreement is good.