Abstract
The effects of dust on 1.06-μm laser-induced air breakdown for 100-nsec pulses are reported. The thresholds in clean air were measured as a function of spot size and were found to scale as λ−2 compared to the 10.6-μm results. A single 50-μm carbon particle present in the beam lowered the threshold to ≃5×109 W/cm2 —a factor of approximately 0.02 that of clean air. The fractional reduction in threshold due to dust particles was comparable to that reported for 10.6-μm breakdown.
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