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Optimally Enhanced Optical Emission in Laser-Induced Breakdown Spectroscopy by Combining Spatial Confinement and Dual-Pulse Irradiation" (2012)

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Optimally Enhanced Optical Emission in Laser-Induced Breakdown Spectroscopy by Combining Spatial Confinement and Dual-Pulse Irradiation University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications from the Department of Electrical & Computer Engineering, Department of Electrical and Computer Engineering 1-16-2012 Optimally enhanced optical emission in laser- induced breakdown spectroscopy by combining spatial confinement and dual-pulse irradiation L. B. Guo Huazhong University of Science and Technology, University of Nebraska-Lincoln B. Y. Zhang University of Nebraska-Lincoln X. N. He University of Nebraska-Lincoln C. M. Li Huazhong University of Science and Technology, University of Nebraska-Lincoln Y. S. Zhou University of Nebraska-Lincoln, [email protected] See next page for additional authors Follow this and additional works at: http://digitalcommons.unl.edu/electricalengineeringfacpub Part of the Computer Engineering Commons, and the Electrical and Computer Engineering Commons Guo, L. B.; Zhang, B. Y.; He, X. N.; Li, C. M.; Zhou, Y. S.; Wu, T.; Park, J. B.; Zeng, X. Y.; and Lu, Yongfeng, "Optimally enhanced optical emission in laser-induced breakdown spectroscopy by combining spatial confinement and dual-pulse irradiation" (2012). Faculty Publications from the Department of Electrical and Computer Engineering. 232. http://digitalcommons.unl.edu/electricalengineeringfacpub/232 This Article is brought to you for free and open access by the Electrical & Computer Engineering, Department of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications from the Department of Electrical and Computer Engineering by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Authors L. B. Guo, B. Y. Zhang, X. N. He, C. M. Li, Y. S. Zhou, T. Wu, J. B. Park, X. Y. Zeng, and Yongfeng Lu This article is available at DigitalCommons@University of Nebraska - Lincoln: http://digitalcommons.unl.edu/ electricalengineeringfacpub/232 Optimally enhanced optical emission in laser- induced breakdown spectroscopy by combining spatial confinement and dual-pulse irradiation L. B. Guo,1,2 B. Y. Zhang,2 X. N. He,2 C. M. Li,1,2 Y. S. Zhou,2 T. Wu,1 J. B. Park,2 X. Y. Zeng,1 and Y. F. Lu2,* 1Wuhan National Laboratory for Optoelectronics (WNLO), College of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China 2Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA *[email protected] Abstract: In laser-induced breakdown spectroscopy (LIBS), a pair of aluminum-plate walls were used to spatially confine the plasmas produced in air by a first laser pulse (KrF excimer laser) from chromium (Cr) targets with a second laser pulse (Nd:YAG laser at 532 nm, 360 mJ/pulse) introduced parallel to the sample surface to re-excite the plasmas. Optical emission enhancement was achieved by combing the spatial confinement and dual-pulse LIBS (DP-LIBS), and then optimized by adjusting the distance between the two walls and the interpulse delay time between both laser pulses. A significant enhancement factor of 168.6 for the emission intensity of the Cr lines was obtained at an excimer laser fluence of 5.6 J/cm2 using the combined spatial confinement and DP-LIBS, as compared with an enhancement factor of 106.1 was obtained with DP-LIBS only. The enhancement mechanisms based on shock wave theory and reheating in DP- LIBS are discussed. ©2012 Optical Society of America OCIS codes: (300.6365) Spectroscopy, laser induced breakdown; (350.5400) Plasmas. References and links 1. L. J. Radziemski and D. A. Cremers, Laser Induced Plasma and Applications, (Marcel Dekker, New York, 1989). 2. U. Panne, R. E. Neuhauser, M. Theisen, H. Fink, and R. Niessner, “Analysis of heavy metal aerosols on filters by laser-induced plasma spectroscopy,” Spectrochim. Acta, B At. Spectrosc. 56(6), 839–850 (2001). 3. L. M. Cabalín and J. J. 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