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Formation of amorphous carbon on melting of microcrystalline graphite by picosecond laser pulses

  • M. B. Agranat
  • S. I. Ashitkov
  • A. V. Kirillin
  • A. V. Kostanovskii
  • V. E. Fortov
  • S. I. Anisimov
  • P. S. Kondratenko
Condensed Matter

Abstract

Observations of microcrystalline graphite subjected to picosecond laser pulses reveal the formation of a liquid phase with a subsequent transition to a uniform amorphous state of a surface layer upon solidification. This phenomenon is observed 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 the laser pulse. A structural analysis of the amorphous phase is performed by electron microscopy and Raman scattering spectroscopy. A periodic structure with a period of the order of the wavelength of the heating pulse is formed in the heating region. The “rulings” of this periodic structure are oriented in the direction of polarization of the heating pulse. A study of the reflection kinetics of the probe laser pulse showed that the characteristic existence time of the liquid phase and of the solidification process is ∼10−10 s.

PACS numbers

81.05.Gc 81.05.Tp 64.70.Dv 

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Copyright information

© MAIK "Nauka/Interperiodica" 1997

Authors and Affiliations

  • M. B. Agranat
    • 1
  • S. I. Ashitkov
    • 1
  • A. V. Kirillin
    • 1
  • A. V. Kostanovskii
    • 1
  • V. E. Fortov
    • 1
  • S. I. Anisimov
    • 2
  • P. S. Kondratenko
    • 3
  1. 1.Scientific-Research Center of Thermal Physics of Pulsed Effects, Joint Institute of High TemperaturesRussian Academy of SciencesMoscowRussia
  2. 2.L. D. Landau Institute of Theoretical PhysicsRussian Academy of SciencesChernogolovka, Moscow RegionRussia
  3. 3.Institute of the Problems of Safe Development of Atomic EnergyRussian Academy of SciencesMoscowRussia

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