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 (KD2PO4). Evidence taken from the experimentally measured wavelength dependence of the breakdown threshold suggests that the material excitation me...

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Bibliographic Details
Published in:Journal of applied physics 2014-03, Vol.115 (10)
Main Authors: Duchateau, Guillaume, Feit, Michael D., Demos, Stavros G.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Applied physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Conduction bands
Crystal defects
CRYSTALS
Density
Dependence
Deuteration
DIELECTRIC MATERIALS
ELECTRONIC STRUCTURE
ENERGY ABSORPTION
Energy gap
EXCITATION
KDP crystals
Laser induced breakdown
LASER-PRODUCED PLASMA
Material properties
PHASE TRANSFORMATIONS
PHOTONS
PLASMA DENSITY
POTASSIUM PHOSPHATES
SOLIDS
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Summary:We investigate theoretically the transition from solid dielectric materials to warm solid density plasma during laser-induced breakdown in DKDP crystals (KD2PO4). 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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4868161