The effect of an external electric field on laser-generated plasma has been studied. It is observed that the laser-generated plasma can be used for the ignition of a spark in the presence of a low voltage external electric field. An eight-fold emission intensity enhancement in Cu I spectral lines are measured as compared to the signal intensity in the absence of an external electric field. The plasma parameters remain the same initially, up to a few microseconds after the generation of plasma, and this feature makes it more interesting for the quantitative analysis of any sample using laser induced breakdown spectroscopy (LIBS). In the presence of an external electric field, fluctuations (contraction and expansion) in the laser-generated plasma are observed which increase the plasma decay time and consequently result in enhanced signal intensity.

已经研究了外部电场对激光产生的等离子体的影响。据观察，激光产生的等离子体可用于在存在低压外部电场的情况下点燃火花。与在没有外部电场的情况下的信号强度相比，测量了 Cu I 谱线中八倍的发射强度增强。等离子体参数最初保持不变，直到等离子体产生后的几微秒内，这一特性使得使用激光诱导击穿光谱 (LIBS) 对任何样品进行定量分析变得更加有趣。在存在外部电场的情况下，观察到激光产生的等离子体中的波动（收缩和膨胀），这会增加等离子体衰减时间，从而导致信号强度增强。