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Analysis of Picosecond Pulsed Laser Melted Graphite

Published online by Cambridge University Press:  28 February 2011

J. Steinbeck ,
G. Braunstein ,
J. Speck ,
M. S. Dresselhaus ,
C. Y. Huang ,
A. M. Malvezzi  and
N. Bloembergen
J. Steinbeck
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
G. Braunstein
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
J. Speck
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
M. S. Dresselhaus
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
C. Y. Huang
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
A. M. Malvezzi
Affiliation:
Harvard University, Cambridge, MA 02138
N. Bloembergen
Affiliation:
Harvard University, Cambridge, MA 02138
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Abstract

A Raman microprobe and TEM have been used to analyze the resolidified region of liquid carbon generated by picosecond pulse laser radiation. From the relative intensities of the zone center Raman-allowed mode for graphite at 1582cm−1 and the disorder-induced mode at 1360cm−1 , the average graphite crystallite size in the resolidified region is determined as a function of incident pulse energy density. By comparing with Rutherford backscattering spectra and Raman spectra from nanosecond pulsed laser melting experiments, additional information about the disorder depth in picosecond pulsed laser melted graphite is obtained. Comparisons of TEM micrographs for nanosecond and picosecond pulsed laser melting experiments show that the structure of the laser disordered regions in graphite are similar and exhibit similar behavior with increasing laser pulse fluence. The similarities in the resolidified regions under both irradiation schemes discourages a determination of the properties of liquid carbon after the liquid has resolidified.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 74: Symposium A – Beam-Solid Interactions and Transient Processes , 1986 , 263
Copyright
Copyright © Materials Research Society 1987

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References

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