Abstract
Experiments have been performed to determine the reduction of the laser-induced breakdown threshold of 1 atmosphere air due to the presence of particulate matter. SiO 2 and carbon fibers with diameters ranging from 6.6 μ to 68 μ were placed in the focal volume and irradiated by 30 nsec, 1.06 μ laser pulses. The reduction in breakdown threshold is found to be comparable to that previously reported for 10.6 μ radiation. Within the experimental accuracy, the breakdown threshold scales as λ -2.
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