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Proceedings Paper

Diagnostics of laser plasma interaction
Author(s): Xianfan Xu; H. Kevin Song
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Paper Abstract

This paper describes diagnostics experiments of pulsed excimer laser induced plasma. During excimer laser heating, the intense radiation flux from the laser is transformed to the target material and raises the temperature of the target surface rapidly. Melting and evaporation can occur, and the evaporated vapor can be ionized to form a plasma plume. Under rapid heating by a short laser pulse, the melted material can be superheated, and undergoes a phase explosion that turns the melt into a mixture of liquid and vapor. A number of experiments are carried out to investigate the laser-ablated plume. The velocity of the laser-evaporated plasma plume, absorption and scattering of the laser energy by the plasma, the threshold laser fluence for phase explosion, the evaporation pressure at the target surface, and the ablation rate are determined. Experiments are performed in a laser fluence range between 2.5 J/cm2 and 10 J/cm2 (between 100 MW/cm2 and 400 MW/cm2) on nickel specimens. Results of these studies reveal phase change mechanisms and the kinetics at the evaporating surface during excimer laser interaction with the Ni target.

Paper Details

Date Published: 23 March 2000
PDF: 8 pages
Proc. SPIE 3935, Laser Plasma Generation and Diagnostics, (23 March 2000); doi: 10.1117/12.380804
Show Author Affiliations
Xianfan Xu, Purdue Univ. (United States)
H. Kevin Song, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 3935:
Laser Plasma Generation and Diagnostics
Richard F. Haglund Jr.; Richard F. Wood, Editor(s)

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