Authors: Budi, Wahyu Setia; Suyanto, Hery; Kurniawan, Hendrik; Tjia, May On; Kagawa, Kiichiro

Source: Applied Spectroscopy, Volume 53, Issue 6, Pages 206A-247A and 619-747 (June 1999) , pp. 719-730(12)

Publisher: Society for Applied Spectroscopy

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.

Keywords: LASER-INDUCED PLASMAS; SHOCK-WAVE PLASMA; SHOCK EXCITATION; COOLING STAGE; SPECTROCHEMICAL APPLICATION

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702991947162

Publication date: 1999-06-01

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