Abstract

An experimental study has been carried out on the dynamical process taking place in the secondary plasma generated by a Q-switched Nd:YAG laser (80 mJ, 8 ns) on a copper target at reduced pressure. Accurate dynamical characterization of the cross-sectional view of the plasma has been made possible by the unique combination of a plasma confinement configuration and the time-resolved measurement technique. In addition to reaffirming the role of the blast-wave mechanism in the generation of secondary plasma, an analysis of the time-resolved spatial distributions of emission intensities and the time-resolved spatial distributions of temperature was made. As a result, the occurrence of two-stage emission processes, the "shock excitation stage" and "cooling stage," has been proved. For instance, at 2 Torr it is shown that the emission process is initiated by a brief shock excitation process (~1 mu s) and followed by a longer cooling process (~3 mu s). The experimental results concerning the characteristics of the plasma can be well understood by considering the two-stage processes.

Direct evidence of laser-induced shock wave plasma from organic targets in low pressure He ambient gas, showing the effect of target hardness on its propagation speed and the resulted spectral performance

Kurnia Lahna, Marincan Pardede, Koo Hendrik Kurniawan, Kiichiro Kagawa, and May On Tjia
Appl. Opt. 56(36) 9876-9881 (2017)

Novel control of plasma expansion direction aimed at very low pressure laser-induced plasma spectroscopy

Soo-Jin Choi, Jae-Jun Choi, and Jack J. Yoh
Opt. Express 23(5) 6336-6344 (2015)

Influence of surface roughness on nanosecond laser-induced shock wave enhancement effects

Lei Chen, Chuan Guo, Zelin Liu, Hao Liu, Minsun Chen, Zhongjie Xu, Guomin Zhao, and Kai Han
Appl. Opt. 61(29) 8859-8863 (2022)

Practical and highly sensitive elemental analysis for aqueous samples containing metal impurities employing electrodeposition on indium-tin oxide film samples and laser-induced shock wave plasma in low-pressure helium gas

Koo Hendrik Kurniawan, Marincan Pardede, Rinda Hedwig, Syahrun Nur Abdulmadjid, Kurnia Lahna, Nasrullah Idris, Eric Jobiliong, Hery Suyanto, Maria Margaretha Suliyanti, May On Tjia, Tjung Jie Lie, Zener Sukra Lie, Davy Putra Kurniawan, and Kiichiro Kagawa
Appl. Opt. 54(25) 7592-7597 (2015)

Radiative model of post-breakdown laser-induced plasma expanding into ambient gas

A. Ya. Kazakov, I. B. Gornushkin, N. Omenetto, B. W. Smith, and J. D. Winefordner
Appl. Opt. 45(12) 2810-2820 (2006)