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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 28, Iss. 8 — Aug. 1, 2011
  • pp: 1817–1824

Atomistic modeling of ultrashort-pulse ultraviolet laser ablation of a thin LiF film

Yaroslav Cherednikov, Nail A. Inogamov, and Herbert M. Urbassek  »View Author Affiliations


JOSA B, Vol. 28, Issue 8, pp. 1817-1824 (2011)
http://dx.doi.org/10.1364/JOSAB.28.001817


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Abstract

We study UV-laser-induced melting and ablation of 10 nm thick LiF films by UV laser irradiation. Our method combines a molecular dynamics scheme for LiF and a set of equations describing the temporal evolution of the conduction-electron density and temperature due to laser irradiation. We find that with increasing laser fluence, the crystal is heated, then melts, then temporary voids form, until it finally ablates, and even multifragmentation occurs. This sequence of events parallels that found in other materials, such as in metals, with similar values for the relative energization thresholds, if normalized to the cohesive energy of the material or to the melting temperature. The ablation mechanism is shown to be mechanical spallation of the molten crystal due to the high tensile pressure building up after the oscillatory relaxation of the initial high thermoelastic pressure.

© 2011 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
(160.3220) Materials : Ionic crystals
(310.3840) Thin films : Materials and process characterization
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Thin Films

History
Original Manuscript: February 7, 2011
Revised Manuscript: May 21, 2011
Manuscript Accepted: May 24, 2011
Published: July 5, 2011

Citation
Yaroslav Cherednikov, Nail A. Inogamov, and Herbert M. Urbassek, "Atomistic modeling of ultrashort-pulse ultraviolet laser ablation of a thin LiF film," J. Opt. Soc. Am. B 28, 1817-1824 (2011)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-28-8-1817

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