We demonstrate the cooperative effect of near infrared (NIR) and ultraviolet (UV) beams on laser-induced condensation. Launching a UV laser after a NIR pulse yields up to a 5-fold increase in the production of nanoparticles (25–300 nm) as compared to a single NIR beam. This cooperative effect exceeds the sum of those from the individual beams and occurs for delays up to 1 μs. We attribute it to the UV photolysis of ozone created by the NIR pulses. The resulting OH radicals oxidize NO2 and volatile organic compounds, producing condensable species.
Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation
M. Matthews, S. Henin, F. Pomel, F. Théberge, P. Lassonde, J.-F. Daigle, J.-C. Kieffer, J. Kasparian, J.-P. Wolf; Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation. Appl. Phys. Lett. 23 December 2013; 103 (26): 264103. https://doi.org/10.1063/1.4857895
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