Theory for laser-induced breakdown over vaporizing target surface

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Description

A simple but accurate theoretical model is developed to describe the growth of avalanche ionization (breakdown) in the blowoff vapor from a laser-irradiated surface. This nonequilibrium model is applicable to laser intensities and wavelengths from approximately 10/sup 7/ to 10/sup 12/ ..mu..m/sup 2/.W/cm/sup 2/ for lambda/sub L//sup 2/.I/sub 0/, the square of the laser wavelength times its peak intensity. The model pertains only to the early stages of laser-target interaction, from the time surface vaporization begins to when first-degree ionization is achieved in the vapor. Approximate analytical solutions are found for the basic differential equations of the model, and such ... continued below

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Pages: 27

Creation Information

Harrach, R.J. December 1, 1977.

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  • Lawrence Livermore Laboratory
    Publisher Info: California Univ., Livermore (USA). Lawrence Livermore Lab.
    Place of Publication: Livermore, California

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Description

A simple but accurate theoretical model is developed to describe the growth of avalanche ionization (breakdown) in the blowoff vapor from a laser-irradiated surface. This nonequilibrium model is applicable to laser intensities and wavelengths from approximately 10/sup 7/ to 10/sup 12/ ..mu..m/sup 2/.W/cm/sup 2/ for lambda/sub L//sup 2/.I/sub 0/, the square of the laser wavelength times its peak intensity. The model pertains only to the early stages of laser-target interaction, from the time surface vaporization begins to when first-degree ionization is achieved in the vapor. Approximate analytical solutions are found for the basic differential equations of the model, and such key quantities as breakdown time and threshold values of laser fluence and intensity are expressed in terms of simple formulas. With the model, we can thus easily predict general trends and specific parametric dependences. The analytical solutions are shown to agree well with accurate numerical solutions of the model's equations and with documented data on CO/sub 2/ laser-induced breakdown over aluminum targets.

Physical Description

Pages: 27

Notes

Dep. NTIS, PC A03/MF A01.

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  • Report No.: UCRL-52389
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/5139271 | External Link
  • Office of Scientific & Technical Information Report Number: 5139271
  • Archival Resource Key: ark:/67531/metadc1059870

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • December 1, 1977

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

Description Last Updated

  • Feb. 1, 2018, 12:57 p.m.

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Harrach, R.J. Theory for laser-induced breakdown over vaporizing target surface, report, December 1, 1977; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1059870/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.