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Optical breakdown threshold in fused silica with femtosecond laser pulses

Published online by Cambridge University Press:  24 July 2013

A. Bendib ,
K. Bendib-Kalache  and
C. Deutsch
A. Bendib*
Affiliation:
Quantum Electronic Laboratory, Faculty of Physics, USTHB, Algiers, Algeria
K. Bendib-Kalache
Affiliation:
Quantum Electronic Laboratory, Faculty of Physics, USTHB, Algiers, Algeria
C. Deutsch
Affiliation:
Laboratoire de physique des gaz et des plasmas, UMR 8578, Université Paris-Sud 11, Orsay, France
*
Address correspondence and reprint requests to: A. Bendib, Quantum Electronic Laboratory, Faculty of Physics, USTHB, El Alia BP 32, Bab Ezzouar 16111, Algiers, Algeria. E-mail address: mbendib@hotmail.com
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Abstract

A theoretical model for electrons in the conduction band intend to investigate the optical breakdown threshold in femtosecond laser pulse-fused silica interaction is presented. The model is derived from a rate equation that includes the avalanche and multi-photon ionization processes of Thornber and Keldysh, respectively, and also the three-body and exciton recombination mechanisms. In addition, the time evolution of electron mean energy is also considered through the energy balance equation. The mean energy acts as a trigger for the avalanche mechanism. The evolution of electron density profiles is calculated and discussed with respect to the ionization and recombination mechanisms. The results for the fluence threshold as a function of the pulse duration fall in good agreement with the experimental data reported in the literature.

Keywords

DielectricsOptical breakdownUltra-short laser pulse

Information

Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 3 , September 2013 , pp. 523 - 529
Copyright
Copyright © Cambridge University Press 2013 

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