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Proceedings Paper

Advanced double-pulse UV source for laser-induced fluorescence of bioaerosols
Author(s): Gilles Feugnet; Arnaud Grisard; Eric Lallier; Lee McIntosh; Jonas Hellström
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Paper Abstract

To enhance discrimination of UV-laser-induced-fluorescence based bio-aerosol-detection-system, a UV-laser is described that allows multiple wavelength excitation of bio-aerosols and both fluorescence spectral and time-decay analysis. The latter requiring sub-ns pulse duration, a two-stage-amplifier boosts a 20-µJ-1064-nm-500-ps-actively-Q-Switch microchip-oscillator output energy up to 2.5 mJ. After frequency doubling and beam splitting, 20-µJ-293-and-337-nm pulses are generated by two different periodically-poled-KTP (parametric generation) and BBO (frequency doubling) crystal arrangements. In order to get distinct fluorescence signals for each wavelength, the beams are then time-delayed with two optical fibers of different lengths and launched into a chamber for bio-aerosol excitation connected to a fast detection system.

Paper Details

Date Published: 2 October 2008
PDF: 7 pages
Proc. SPIE 7116, Optically Based Biological and Chemical Detection for Defence IV, 71160O (2 October 2008); doi: 10.1117/12.799143
Show Author Affiliations
Gilles Feugnet, Thales Research & Technology (France)
Arnaud Grisard, Thales Research & Technology (France)
Eric Lallier, Thales Research & Technology (France)
Lee McIntosh, Cobolt AB (Sweden)
Jonas Hellström, Cobolt AB (Sweden)

Published in SPIE Proceedings Vol. 7116:
Optically Based Biological and Chemical Detection for Defence IV
John C. Carrano; Arturas Zukauskas, Editor(s)

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