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【摘 要】
：
研究了预电离到各种电子密庹的大气压氦气中10.6徵米高功率激光脉冲的焦点体积内、电离的建立与气体击穿过程。在没有预电离对，击穿所需的激光通量与以前的一些作者得到的结杲相符，并表明了对于焦点体积大小的同样的依赖关系。然而，在初始电子密度高对，阈值则低得多，而且与体积无共。此结杲表明，在预电离的情况下，击穿阈值由级联的电离辻程所控制，而没有弱电离时，它则由其它的诸如气体中小杂屑粒子的效应所支配，而其它这些效应可能是导致击穿阈值与直径有关的原因。
【出 处】
：
激光与光电子学进展
【发表日期】
：
1973年10期
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