We report the breakdown behaviors of simple gaseous and liquid materials under double-pulse excitation from an intense picosecond Nd:YAG laser. With an increasing in the separation time of the pulse pair, a sharp increase in the intensity and decay time of a white-light emission from the breakdown plasma was observed. The further excitation of the preformed plasma by the second pulse explains the origin of the phenomenon.
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Hosoda et al. (1999) studied this question.
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