424 K
11 pp.
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TitleAnalysis of Picosecond Pulsed Laser Melted Graphite
Author(s)Steinbeck, J.; Braunstein, G.; Speck, J. ; Dresselhaus, M. S.; Huang, C. Y.; Malvezzi, A. M.; Bloembergen, N.
Publication DateDecember 1986
Report NumberLA-UR-86-4339
Unique IdentifierACC0417
Other NumbersCONF-861207-45; Legacy ID: DE87003755; OSTI ID: 6973903
Research OrgLos Alamos National Laboratory (LANL), NM (USA); Massachusetts Institute of Technology (MIT), Cambridge (USA); Harvard University, Cambridge, MA (USA)
Contract NoW-7405-ENG-36
Sponsoring OrgU.S. Department of Energy (DOE)
Other InformationSymposium on Beam-solid Interactions, Boston, MA, USA, 1-6 Dec 1986
Subject75 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
Related Web PagesMildred [Millie] Dresselhaus and her Impacts on Science and Women in Science
AbstractA 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 nanosecond 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.
424 K
11 pp.
View Document 

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