Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation

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 exceed...

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Veröffentlicht in:Applied physics letters 2013-12, Vol.103 (26)
Hauptverfasser: Matthews, M., Henin, S., Pomel, F., Théberge, F., Lassonde, P., Daigle, J.-F., Kieffer, J.-C., Kasparian, J., Wolf, J.-P.
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Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4857895