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International Conference on Application of Photonic Technology, 2008-06-02
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Investigation of Laser-Induced Breakdown Spectroscopy combined
with Laser-Induced Fluorescence
Laville, Stéphane; Gouegel, Christian; Loudyi, Hakim; Chaker, Mohamed;
Sabsabi, Mohamad; Vidal, Francois
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https://nrc-publications.canada.ca/eng/view/object/?id=35f8c1b5-4636-47e4-8227-e9d0bd25512f https://publications-cnrc.canada.ca/fra/voir/objet/?id=35f8c1b5-4636-47e4-8227-e9d0bd25512f
Investigation of Laser-Induced Breakdown Spectroscopy
combined with Laser-Induced Fluorescence.
Stéphane Laville1, Christian Gouegel2, Hakim Loudyi2, Mohamed Chaker2,
Mohamad Sabsabi1 and François Vidal1
1 National Research Council of Canada, Industrial Materials Institute,
75 de Mortagne Blvd., Boucherville, Quebec, Canada J4B 6Y4
2 INRS – Énergie, Matériaux et Télécommunications,
1650 boul. Lionel Boulet, Varennes, Quebec, Canada J3X 1S2
Contact: stephane.laville@imi.cnrc-nrc.gc.ca
Abstract
Induced Breakdown Spectroscopy (LIBS) technique combined with a Laser-Induced Fluorescence (LIF) approach is known to be a high sensitivity and high selectivity analytical technique. Although sub-ppm limits of detection (LoD) have already been demonstrated, there is still a constant and urgent need to reach lower LoDs. This improvement can only be achieved by investigating the influence of the numerous experimental parameters. Here, as a proof of concept, we report results obtained for the detection of lead traces in brass samples. The plasma was produced by a Q-switched Nd:YAG laser and then excited selectively by a nanosecond OPO laser. The experiments were performed in air at atmospheric pressure. The excitation wavelength was 283.31 nm while the detected fluorescence wavelength was 405.78 nm. The influence of the ablation fluence, the delay between both ablation and excitation laser pulses and the excitation energy on the LIF signal emitted by lead was studied. A physical interpretation was also provided to support the experimental results. The optimal conditions were obtained for an ablation fluence of about 3 J/cm2 and an inter-pulse delay of about 5-10 s. Also, an
excitation energy of at least about 60 J was required to maximize the LIF signal. Using the LIBS-LIFS technique, a value of 180 ppb was obtained accumulating over 100 laser shots that corresponds to an improvement of about two orders of magnitude with respect to LIBS.
