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Time-Resolved Picosecond Optical Study of Laser-Excited Graphite

Published online by Cambridge University Press:  26 February 2011

C. Y. Huang ,
A. M. Malvezzi ,
J. N. Liu  and
N. Bloembergen
C. Y. Huang
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
A. M. Malvezzi
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138
J. N. Liu
Affiliation:
GTE Laboratories, 40 Sylvan Road, Waltham, MA 02254
N. Bloembergen
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138
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Abstract

The pump-and-probe technique is employed to perform picosecond timeresolved measurements of the reflectivity changes in highly oriented pyrolitic graphite excited by 0.532-μm pump pulses. At low pump fluences, the presence of a short-lived plasma and a high-temperature gradient gives rise to an increase in the reflectivity probed at 1.9 μm but causes a decrease at 1.064 μm. At the threshold fluence, 140 mJ/cm2, the reflectivity drops abruptly, marking a phase transformation. Above the threshold, the reflectivity drops to -0.2 from its original value of 0.42 at 1.064 μm and to -0.4 from its ambient value of 0.50 at 1.9 μm. This new phase persists only for a few nanoseconds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 51: Symposium A – Beam-Solid Interactions and Phase Transformations , 1985 , 245
Copyright
Copyright © Materials Research Society 1985

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References

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