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当普通脉冲激光聚焦照射金属或绝缘体靶时，在靶前面激光产生的蒸汽和溅射物质中，观察到空间电信号。本文报导了有关实验结果，并作了定性分析。
When a normal pulsed laser focuses a metal or insulator target, spatial electrical signals are observed in the laser-generated steam and sputtered material in front of the target. This article reports on the experimental results, and made a qualitative analysis.