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Proceedings Paper

Production of amorphous graphite in picosecond laser interaction experiments
Author(s): Michail B. Agranat; Sergei I. Anisimov; Sergei I. Ashitkov; Vladimir E. Fortov; Alexander V. Kirillin; Petr S. Kondratenko; Alexander V. Kostanovskii
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Paper Abstract

Formation of a liquid phase with subsequent transition to a uniform amorphous state of surface layer upon solidification is observed under action of picosecond laser pulses on microcrystalline graphite. This phenomenon is registered on a definite type of graphite and with the radiation incident on a plane parallel to the sixfold symmetry axis, and only for certain parameters of laser pulse. A study of melting and solidification of graphite is performed using a new method based on partial transmission of incident p-polarized wave into s-polarized reflected wave due to optical anisotropy. A structural analysis of the amorphous phase is performed by electron microscopy and Raman scattering spectroscopy. Periodic surface structures with a period of the order of the wavelength of the heating pulse was detected on amorphous graphite region. The orientation of the structures correlates with polarization of incident laser pulse. The instability to formation of these structures is assumed to be connected with surface electromagnetic wave excitation. The characteristic time of existing of liquid phase and of solidification processes is determined to be approximately 10-10 s.

Paper Details

Date Published: 14 September 1998
PDF: 4 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321517
Show Author Affiliations
Michail B. Agranat, Joint Institute for High Temperatures (Russia)
Sergei I. Anisimov, Landau Institute for Theoretical Physics (Russia)
Sergei I. Ashitkov, Joint Institute for High Temperatures (Russia)
Vladimir E. Fortov, Joint Institute for High Temperatures (Russia)
Alexander V. Kirillin, Joint Institute for High Temperatures (Russia)
Petr S. Kondratenko, Nuclear Safety Institute (Russia)
Alexander V. Kostanovskii, Joint Institute for High Temperatures (Russia)

Published in SPIE Proceedings Vol. 3343:
High-Power Laser Ablation
Claude R. Phipps, Editor(s)

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