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

被引:11
作者
Agranat, MB [1 ]
Ashitkov, SI
Kirillin, AV
Kostanovskii, AV
Fortov, VE
Anisimov, SI
Kondratenko, PS
机构
[1] Russian Acad Sci, Joint Inst High Temp, Sci Res Ctr Thermal Phys Pulsed Effects, Moscow 127412, Russia
[2] LD Landau Theoret Phys Inst, Chernogolovka 142432, Moscow Region, Russia
[3] Russian Acad Sci, Inst Problems Safe Dev Atom Energy, Moscow 113191, Russia
基金
俄罗斯基础研究基金会;
关键词
81.05.Gc; 81.05.Tp; 64.70.Dv;
D O I
10.1134/1.567582
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 similar to 10(-10) s. (C) 1997 American Institute of Physics.
引用
收藏
页码:699 / 703
页数:5
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