Photo-ionization of wide band-gap materials by high-intensity laser radiation

V. E. Gruzdev; J. K. Chen

doi:10.1117/12.671010

7 June 2006 Photo-ionization of wide band-gap materials by high-intensity laser radiation

V. E. Gruzdev, J. K. Chen

Proceedings Volume 6261, High-Power Laser Ablation VI; 62610J (2006) https://doi.org/10.1117/12.671010
Event: High-Power Laser Ablation 2006, 2006, Taos, NM, United States

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.

Citation Download Citation

V. E. Gruzdev and J. K. Chen "Photo-ionization of wide band-gap materials by high-intensity laser radiation", Proc. SPIE 6261, High-Power Laser Ablation VI, 62610J (7 June 2006); https://doi.org/10.1117/12.671010

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