Abstract
We report laser-generated plasmas in atmosphere withelectrical spark generated by a synchronization circuit. The breakdownthresholds under the conditions that the electrical spark is used andnot used are compared. The breakdown threshold has a distinctdecrease after the electrical spark is used. Breakdown thresholds as afunction of atmosphere pressure have also been measured at laserwavelengths 532 nm and 1064 nm for the laser pulse width of 15 ns. We alsodiscuss the principle and performances of the ionized atmosphere byNd:YAG laser under the condition of electrical spark introduction.Multiphoton ionization and cascade ionization play important roles inthe whole process of atmosphere ionization. The free electron inducedby electrical spark can supply the initialization free electron numberfor multiphoton ionization and cascade ionization. A model forbreakdown in atmosphere, which is in good agreement with theexperimental results, is described.
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