Spongelike metal surface generated by laser in the semiconfined configuration

Stjepan Lugomer, Branka Mihaljević, G. Pető, A. Tóth, Eniko Horvath

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A porous surface of tantalum and molybdenum plates has been formed by a nanosecond laser-matter interaction in the "semiconfined configuration," in which the laser plasma is trapped between the target and the transparent cover plate. The evolution of the plasma cloud and the pressure above the surface induce a superheated state in the liquid surface layer. Explosion of the plasma disk and formation of a cylindrical blast wave drive the superheated metastable fluid toward the spinodal, i.e., to the point of absolute thermodynamic instability. Phase explosion of a spinodal fluid occurs through the cascade of bubblings and generates a very porous spongelike surface ~5-7 μm thick (in some cases even ~10 μm), which stays frozen permanently because of ultrafast cooling at the end of the laser pulse. The total area of the porous surface is enlarged ~ 104 times at the microscale range. At even larger magnification, a different, nanoscale-type porosity has been observed.

Original languageEnglish
Article number073305
JournalJournal of Applied Physics
Volume97
Issue number7
DOIs
Publication statusPublished - Apr 1 2005

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metal surfaces
configurations
lasers
explosions
plasma clouds
fluids
liquid surfaces
blasts
tantalum
guy wires
magnification
laser plasmas
microbalances
molybdenum
surface layers
cascades
porosity
cooling
thermodynamics
pulses

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Spongelike metal surface generated by laser in the semiconfined configuration. / Lugomer, Stjepan; Mihaljević, Branka; Pető, G.; Tóth, A.; Horvath, Eniko.

In: Journal of Applied Physics, Vol. 97, No. 7, 073305, 01.04.2005.

Research output: Contribution to journalArticle

Lugomer, Stjepan ; Mihaljević, Branka ; Pető, G. ; Tóth, A. ; Horvath, Eniko. / Spongelike metal surface generated by laser in the semiconfined configuration. In: Journal of Applied Physics. 2005 ; Vol. 97, No. 7.
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