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Proceedings Paper

Electron generation in laser-irradiated insulators: theoretical descriptions and their application
Author(s): Bärbel Rethfeld; Stefan Linden; L. Englert; M. Wollenhaupt; L. Haag; C. Sarpe-Tudoran; T. Baumert
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Paper Abstract

Transparent solids may absorb energy from a laser beam of sufficient high intensity. Several models are under consideration to describe the evolution of the free-electron density. Some of these models keep track of the energy distribution of the electrons. In this work we compare different models and give rules to estimate which one is applicable. We present the inclusion of a term in the multiple rate equation approach, recently introduced, describing fast recombination processes to exciton states. Moreover, we present experimental results with temporally asymmetric femtosecond laser pulses, impinging on a surface of fused silica. We found different thresholds for surface material modification with respect to an asymetric pulse and its time reversed counterpart. This difference is due to a different time-and-intensity dependence of the main ionization processes, which can be controlled with help of femtosecond shaped laser pulses.

Paper Details

Date Published: 12 May 2008
PDF: 12 pages
Proc. SPIE 7005, High-Power Laser Ablation VII, 70050O (12 May 2008); doi: 10.1117/12.784630
Show Author Affiliations
Bärbel Rethfeld, Technische Univ. Kaiserslautern (Germany)
Stefan Linden, Technische Univ. Kaiserslautern (Germany)
L. Englert, Univ. Kassel (Germany)
M. Wollenhaupt, Univ. Kassel (Germany)
L. Haag, Univ. Kassel (Germany)
C. Sarpe-Tudoran, Univ. Kassel (Germany)
T. Baumert, Univ. Kassel (Germany)

Published in SPIE Proceedings Vol. 7005:
High-Power Laser Ablation VII
Claude R. Phipps, Editor(s)

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