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17 August 2023 Signal enhancement and mechanism analysis of pulse shaped femtosecond laser-induced breakdown spectroscopy of fused silica
Maolin Guo, Zhao Xu, Weihua Zhu
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Proceedings Volume 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023); 1275707 (2023) https://doi.org/10.1117/12.2690158
Event: 3rd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2023), 2023, Kunming, China
Abstract
The study compared the enhancement effects of vertically polarized double pulse (DP) and quadruple pulse (QP) femtosecond lasers on the laser-induced breakdown spectrum (LIBS) of fused silica, and by analyzing the ratio of multi-pulse ablation volume to single pulse and the change of surface morphology, combined with electron dynamics to explain the mechanism. The results show that at 0.47ps and 7.68ps delay, the ablation volume change caused by photon absorption plays a leading role in the enhancement of LIBS signal, and the signal intensity of DP and QP LIBS is almost the same; at 15.42ps delay, the volume ratio of multi-pulse ablation is basically unchanged, plasma reheating and slow plume component reionization play a leading role, QP signal enhancement effect is stronger than DP, but the ablation volume is only 1/2 of DP. The results show that for dielectric materials such as fused silica, the LIBS of QP femtosecond laser can achieve higher spatial detection resolution than DP, under the premise of ensuring that the excited plasma intensity is not weak or even stronger
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Maolin Guo, Zhao Xu, and Weihua Zhu "Signal enhancement and mechanism analysis of pulse shaped femtosecond laser-induced breakdown spectroscopy of fused silica", Proc. SPIE 12757, 3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023), 1275707 (17 August 2023); https://doi.org/10.1117/12.2690158
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KEYWORDS
Laser ablation
Laser induced breakdown spectroscopy
Pulse signals
Femtosecond pulse shaping
Silica
Signal intensity
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