Abstract
Electrical effect induced by the laser plasma was investigated with an external tiny probe during Nd:YAG high-power pulse laser ablation on copper target in air. One equivalent circuit for the electrical effect induced by laser plasma was proposed. Based on the equivalent circuit, a new theoretical explanation of the signal generation mechanism is proposed, and the reason that the distribution of electrical signal wave is strongly dependent on the probe distance was discussed. Further the observed signal peak polarity overturn was explained.
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