Advanced double-pulse UV source for laser-induced fluorescence of bioaerosols

Gilles Feugnet; Arnaud Grisard; Eric Lallier; Lee McIntosh; Jonas Hellström

doi:10.1117/12.799143

2 October 2008 Advanced double-pulse UV source for laser-induced fluorescence of bioaerosols

Gilles Feugnet, Arnaud Grisard, Eric Lallier, Lee McIntosh, Jonas Hellström

Proceedings Volume 7116, Optically Based Biological and Chemical Detection for Defence IV; 71160O (2008) https://doi.org/10.1117/12.799143
Event: SPIE Security + Defence, 2008, Cardiff, Wales, United Kingdom

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.

Citation Download Citation

Gilles Feugnet, Arnaud Grisard, Eric Lallier, Lee McIntosh, and Jonas Hellström "Advanced double-pulse UV source for laser-induced fluorescence of bioaerosols", Proc. SPIE 7116, Optically Based Biological and Chemical Detection for Defence IV, 71160O (2 October 2008); https://doi.org/10.1117/12.799143

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