100 Femtosecond laser absorption in solid density targets

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Experimental short pulse lasers are rapidly approaching energy levels where target irradiances exceeding 10{sup 20} W/CM{sup 2} are routinely achievable. These high intensity levels will open up a new class of solid target interaction physics where relativistic effects must be included and non-traditional absorption mechanisms become significant. However much remains to be understood of the absorption physics at lower intensities where classical absorption is dominated by collisional and resonance absorption. If attention is paid to producing clean laser pulses that do not significantly pre-pulse interact with the target, it is possible to produce plasmas of sufficiently short scale length that ... continued below

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6 p.

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Price, D.F.; More, R.M.; Walling, R.S. & Stewart, R.E. October 8, 1996.

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Description

Experimental short pulse lasers are rapidly approaching energy levels where target irradiances exceeding 10{sup 20} W/CM{sup 2} are routinely achievable. These high intensity levels will open up a new class of solid target interaction physics where relativistic effects must be included and non-traditional absorption mechanisms become significant. However much remains to be understood of the absorption physics at lower intensities where classical absorption is dominated by collisional and resonance absorption. If attention is paid to producing clean laser pulses that do not significantly pre-pulse interact with the target, it is possible to produce plasmas of sufficiently short scale length that near-solid density interactions are observable at intensities exceeding 10{sup 18} W/CM{sup 2} for 100 fs laser irradiation. We report here extensions to our previous efforts at normal incidence that expand our observations to non-normal angles including the effect of polarization for several target materials. Between 10{sup 13} W/CM{sup 2} and 10{sup 14} W/CM{sup 2} we observe that the target absorption retains a signature of the intra-band atomic transitions. At higher intensities a more material independent ion-electron collisional absorption and short scale length resonance absorption dominate. P - polarized absorption in short scale length plasmas has been observed to exceed 60 percent.

Physical Description

6 p.

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OSTI as DE97051541

Medium: P; Size: 6 p.

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  • Topical meeting on high field interactions and short wavelength generation, Santa Fe, NM (United States), 19-22 Mar 1997

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  • Other: DE97051541
  • Report No.: UCRL-JC--125802
  • Report No.: CONF-970312--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 508735
  • Archival Resource Key: ark:/67531/metadc692443

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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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  • October 8, 1996

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 13, 2017, 12:39 p.m.

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Price, D.F.; More, R.M.; Walling, R.S. & Stewart, R.E. 100 Femtosecond laser absorption in solid density targets, article, October 8, 1996; California. (digital.library.unt.edu/ark:/67531/metadc692443/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.