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Title: Ultrashort pulse laser produced plasmas

Abstract

The interaction of an ultrashort pulse laser with planar aluminum targets and with layered aluminum/silicon targets is investigated with a non-LTE radiation hydrodynamics model. The energy deposition for an obliquely incident P-polarized laser beam is calculated with a Helmholtz wave equation. A fraction of the absorbed energy is expended in the production of fast electrons, which are transported and deposited in the cold target. These electrons produce K-shell vacancies which produce characteristic K{alpha} line radiation. The atomic models include the ground states and an extensive manifold of excited states for each of the materials in the target. The ionization dynamics is calculated with a time dependent collisional radiative model self-consistently coupled to a probabilistic radiation transport scheme. The emitted x-rays, including the K{alpha} radiation, provide information about the energy deposition in the target, the energetic electron spectrum, and the time dependence of the local ionization in the target. The focus of the investigation is directed towards characterizing the radiative properties of the plasma, as well as determining whether the plasma can support population inversions and lasing as a result of recombination into highly ionized excited states in the rapidly cooling blowoff plasma.

Authors:
; ;  [1]
  1. Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375 (United States)
Publication Date:
OSTI Identifier:
21153823
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 332; Journal Issue: 1; Conference: 4. international colloquium: X-ray lasers 1994, Williamsburg, VA (United States), 15-20 May 1994; Other Information: DOI: 10.1063/1.47977; (c) 1994 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; EXCITED STATES; GROUND STATES; HYDRODYNAMICS; IONIZATION; K SHELL; LASER RADIATION; LASER-PRODUCED PLASMA; LASERS; PROBABILISTIC ESTIMATION; PULSES; RADIATION TRANSPORT; RECOMBINATION; SILICON; TAIL ELECTRONS; TIME DEPENDENCE; X RADIATION

Citation Formats

Davis, J, Clark, R W, and Giuliani, J L. Ultrashort pulse laser produced plasmas. United States: N. p., 1995. Web. doi:10.1063/1.47977.
Davis, J, Clark, R W, & Giuliani, J L. Ultrashort pulse laser produced plasmas. United States. https://doi.org/10.1063/1.47977
Davis, J, Clark, R W, and Giuliani, J L. 1995. "Ultrashort pulse laser produced plasmas". United States. https://doi.org/10.1063/1.47977.
@article{osti_21153823,
title = {Ultrashort pulse laser produced plasmas},
author = {Davis, J and Clark, R W and Giuliani, J L},
abstractNote = {The interaction of an ultrashort pulse laser with planar aluminum targets and with layered aluminum/silicon targets is investigated with a non-LTE radiation hydrodynamics model. The energy deposition for an obliquely incident P-polarized laser beam is calculated with a Helmholtz wave equation. A fraction of the absorbed energy is expended in the production of fast electrons, which are transported and deposited in the cold target. These electrons produce K-shell vacancies which produce characteristic K{alpha} line radiation. The atomic models include the ground states and an extensive manifold of excited states for each of the materials in the target. The ionization dynamics is calculated with a time dependent collisional radiative model self-consistently coupled to a probabilistic radiation transport scheme. The emitted x-rays, including the K{alpha} radiation, provide information about the energy deposition in the target, the energetic electron spectrum, and the time dependence of the local ionization in the target. The focus of the investigation is directed towards characterizing the radiative properties of the plasma, as well as determining whether the plasma can support population inversions and lasing as a result of recombination into highly ionized excited states in the rapidly cooling blowoff plasma.},
doi = {10.1063/1.47977},
url = {https://www.osti.gov/biblio/21153823}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 332,
place = {United States},
year = {Mon May 01 00:00:00 EDT 1995},
month = {Mon May 01 00:00:00 EDT 1995}
}