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Title: Transient material properties during defect-assisted laser breakdown in deuterated potassium dihydrogen phosphate crystals

We investigate theoretically the transition from solid dielectric materials to warm solid density plasma during laser-induced breakdown in DKDP crystals (KD{sub 2}PO{sub 4}). Evidence taken from the experimentally measured wavelength dependence of the breakdown threshold suggests that the material excitation mechanisms mainly consist of a sequence of one-photon absorptions between short-lived vibronic defect states spanning the band gap with a quasi-continuum of states. The transition between excitation paths involving different number of photons yields information about the role of temperature in determining the width of the transition and corresponding threshold conduction band density prior to initiation of breakdown. This physical system is well adapted to study a plasma warming up at solid density leading to the so-called warm dense matter.
Authors:
 [1] ; ;  [2]
  1. Université de Bordeaux-CNRS-CEA, Centre Laser Intenses et Applications UMR 5107, 351 Cours de la Libération, 33405 Talence (France)
  2. Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22277893
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CRYSTALS; DIELECTRIC MATERIALS; ELECTRONIC STRUCTURE; ENERGY ABSORPTION; EXCITATION; LASER-PRODUCED PLASMA; PHASE TRANSFORMATIONS; PHOTONS; PLASMA DENSITY; POTASSIUM PHOSPHATES; SOLIDS