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Femtosecond Laser Melting of Graphite and Diamond

Published online by Cambridge University Press:  25 February 2011

D. H. Reitze ,
H. Ahn ,
X. Wang  and
M. C. Downer
D. H. Reitze
Affiliation:
Department of Physics, The University of Texas at Austin, Austin, TX 78712
H. Ahn
Affiliation:
Department of Physics, The University of Texas at Austin, Austin, TX 78712
X. Wang
Affiliation:
Department of Physics, The University of Texas at Austin, Austin, TX 78712
M. C. Downer
Affiliation:
Department of Physics, The University of Texas at Austin, Austin, TX 78712
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Abstract

Femtosecond time-resolved reflectivity measurements performed on highly oriented pyrolytic graphite (HOPG) and diamond elucidate the nature of the phase transition from solid to liquid carbon. In HOPG, we find that a high-reflectivity phase lasting as long as 10 ps appears when the surface is irradiated with pulse fluences in excess of 0.13 J/cm2, the critical fluence for melting. This transforms within 30 ps into an equilibrium low-reflectivity phase lasting hundreds of ps, similar to behavior observed in picosecond reflectivity experiments. The results suggest the occurrence of a two-step phase transition (graphite -> liquid metal -> liquid insulator) when HOPG is excited above the critical fluence. Similar results are obtained with diamond.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 425
Copyright
Copyright © Materials Research Society 1990

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References

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