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Proceedings Paper

Photo-ionization of wide band-gap materials by high-intensity laser radiation
Author(s): V. E. Gruzdev; J. K. Chen
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Paper Abstract

Analyzing existing theoretical models of laser-induced photo-ionization of non-metallic solids, we came to conclusion that they are not valid to describe ionization of wide band-gap materials by high-intensity radiation due to specific limitation on either intensity or laser wavelength. Attempting to improve the theory of photo-ionization, we combined the Keldysh approach and a realistic energy-band model to include the effect of Bragg-type electron reflections at edges of the first Brillouin zone. It was found that the effect of Bragg-type electron reflections produces a set of singularities on intensity dependence of ionization rate. Intensity at which the first singularity occurs is close to 10 TW/cm2 for most transparent materials and visible or near-IR spectrum range. Further considerations show the singularities to be directly related to the effect of field-induced flattening of effective band structure under action of laser radiation. We discuss some recent experimental results from the view-point of the new ionization model.

Paper Details

Date Published: 7 June 2006
PDF: 12 pages
Proc. SPIE 6261, High-Power Laser Ablation VI, 62610J (7 June 2006); doi: 10.1117/12.671010
Show Author Affiliations
V. E. Gruzdev, Univ. of Missouri, Columbia (United States)
J. K. Chen, Univ. of Missouri, Columbia (United States)

Published in SPIE Proceedings Vol. 6261:
High-Power Laser Ablation VI
Claude R. Phipps, Editor(s)

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