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Title: Analysis of picosecond pulsed laser melted graphite

Abstract

A Raman microprobe and high resolution 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 1582 cm/sup -1/ and the disorder-induced mode at 1360 cm/sup -1/, the average graphite crystallite size in the resolidified region is determined as a function of position. By comparison with Rutherford backscattering spectra and Raman spectra from nonosecond pulsed laser melting experiments, the disorder depth for picosecond pulsed laser melted graphite is determined as a function of irradiating energy density. 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (USA); Massachusetts Inst. of Tech., Cambridge (USA); Harvard Univ., Cambridge, MA (USA)
OSTI Identifier:
6973903
Report Number(s):
LA-UR-86-4339; CONF-861207-45
ON: DE87003755
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Materials Research Society fall meeting, Boston, MA, USA, 1 Dec 1986; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; CARBON; SOLIDIFICATION; ELECTRON MICROSCOPY; LASER RADIATION; LIQUIDS; MELTING; RAMAN SPECTROSCOPY; ELECTROMAGNETIC RADIATION; ELEMENTS; FLUIDS; LASER SPECTROSCOPY; MICROSCOPY; NONMETALS; PHASE TRANSFORMATIONS; RADIATIONS; SPECTROSCOPY; 656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-); 360602 - Other Materials- Structure & Phase Studies

Citation Formats

Steinbeck, J., Braunstein, G., Speck, J., Dresselhaus, M.S., Huang, C.Y., Malvezzi, A.M., and Bloembergen, N. Analysis of picosecond pulsed laser melted graphite. United States: N. p., 1986. Web.
Steinbeck, J., Braunstein, G., Speck, J., Dresselhaus, M.S., Huang, C.Y., Malvezzi, A.M., & Bloembergen, N. Analysis of picosecond pulsed laser melted graphite. United States.
Steinbeck, J., Braunstein, G., Speck, J., Dresselhaus, M.S., Huang, C.Y., Malvezzi, A.M., and Bloembergen, N. Wed . "Analysis of picosecond pulsed laser melted graphite". United States. doi:. https://www.osti.gov/servlets/purl/6973903.
@article{osti_6973903,
title = {Analysis of picosecond pulsed laser melted graphite},
author = {Steinbeck, J. and Braunstein, G. and Speck, J. and Dresselhaus, M.S. and Huang, C.Y. and Malvezzi, A.M. and Bloembergen, N.},
abstractNote = {A Raman microprobe and high resolution 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 1582 cm/sup -1/ and the disorder-induced mode at 1360 cm/sup -1/, the average graphite crystallite size in the resolidified region is determined as a function of position. By comparison with Rutherford backscattering spectra and Raman spectra from nonosecond pulsed laser melting experiments, the disorder depth for picosecond pulsed laser melted graphite is determined as a function of irradiating energy density. 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}

Conference:
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