Ultrafast lasers and solids in highly excited states: results of hydrodynamics and molecular dynamics simulations

Action of ultrafast optical and X-ray lasers on metals is considered. It is known that under certain conditions surface structures appear as result of irradiation. Generation of nano-structures is usually associated with excitation of surface plasmons. But often structures do not have forms of rippl...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-05, Vol.510 (1), p.12041-15
Main Authors: Inogamov, Nail A, Zhakhovsky, Vasily V, Khokhlov, Viktor A, Ashitkov, Sergey I, Emirov, Yusuf N, Khichshenko, Konstantin V, Faenov, Anatoly Ya, Pikuz, Tatiana A, Ishino, Masahiko, Kando, Masaki, Hasegawa, Nobory, Nishikino, Masaharu, Komarov, Pavel S, Demaske, Brian J, Agranat, Mikhail B, Anisimov, Sergey I, Kawachi, Tetsuya, Oleynik, Ivan I
Format: Article
Language:English
Subjects:
Excitation
Foaming
Foams
Freezing
Lasers
Liquid metals
Molecular dynamics
Nanostructure
Physics
Plasmons
Spallation
Surface layers
Ultrafast lasers
X ray lasers
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Summary:Action of ultrafast optical and X-ray lasers on metals is considered. It is known that under certain conditions surface structures appear as result of irradiation. Generation of nano-structures is usually associated with excitation of surface plasmons. But often structures do not have forms of ripples, and their spacial scales are order of magnitude less than optical wavelength. In the paper full description of surface nano-structures is given for the case of single shot laser action onto well polished boundaries. Plasmon effects are insignificant for this case and also for X-ray pulses. It is shown that structures are formed after laser illumination in a process of mechanical spallation of ultrathin surface layer of molten metal. Spallation is accompanied by a strong foaming of melt, breaking of foam, and freezing of foam remnants. Those remnants form chaotic nano-structures observed in experiments.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/510/1/012041