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Beam-Metal Surface Interactions Using an Excimer Laser

Published online by Cambridge University Press:  26 February 2011

Joseph Pellegrino ,
Julian P. Partridge ,
A. Magee  and
P. Strutt
Joseph Pellegrino
Affiliation:
The University of Connecticut, Institute of Materials Science and Department of Metallurgy, Storrs, CT 06268.
Julian P. Partridge
Affiliation:
The University of Connecticut, Institute of Materials Science and Department of Metallurgy, Storrs, CT 06268.
A. Magee
Affiliation:
The University of Connecticut, Institute of Materials Science and Department of Metallurgy, Storrs, CT 06268.
P. Strutt
Affiliation:
The University of Connecticut, Institute of Materials Science and Department of Metallurgy, Storrs, CT 06268.
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Abstract

In view of material technological developments, studies have been made of the interactive processes involved in irradiation of metals with an excimer laser. These studies involved single-pulse irradiation of Al, Ni, Ti, and Zn at various powers up to about 5 MW. Systematic studies at widely differing, yet reproducible, power densities were facilitated using numerically controlled beam focusing. By changing the incident intensity, different plasma pressures were produced during surface melting. These created various types of unstable ripple patterns which emanated radially from the center of beam incidence and were enhanced by immersion in liquid nitrogen.

The results showed only minor differences between substrates possessing different physical properties and the influence of crystallographic orientation was also found to be minimal. An elliptical disturbance zone was produced on the substrates when the beam was defocused and this is attributed to astigmatic effects associated with a lens system incorporating spherical refracting surfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 82: Symposium I – Characterization of Defects in Materials , 1986 , 505
Copyright
Copyright © Materials Research Society 1987

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References

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