11 pp.
11 pp.
| 424 K 11 pp. | |
| View Document | ||
| Title | Analysis 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 Date | December 1986 | |
| Report Number | LA-UR-86-4339 | |
| Unique Identifier | ACC0417 | |
| Other Numbers | CONF-861207-45; Legacy ID: DE87003755; OSTI ID: 6973903 | |
| Research Org | Los Alamos National Laboratory (LANL), NM (USA); Massachusetts Institute of Technology (MIT), Cambridge (USA); Harvard University, Cambridge, MA (USA) | |
| Contract No | W-7405-ENG-36 | |
| Sponsoring Org | U.S. Department of Energy (DOE) | |
| Other Information | Symposium on Beam-solid Interactions, Boston, MA, USA, 1-6 Dec 1986 | |
| 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 | |
| Related Web Pages | Mildred [Millie] Dresselhaus and her Impacts on Science and Women in Science | |
| 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 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 | ||
