Journal article
Control of ionization processes in high band gap materials via tailored femtosecond pulses



Publication Details
Authors:
Englert, L.; Rethfeld, B.; Haag, L.; Wollenhaupt, M.; Sarpe-Tudoran, C.; Baumert, T.
Publication year:
2007
Journal:
Optics Express
Pages range:
17855-17862
Volume number:
15
Start page:
17855
End page:
17862
ISSN:
1094-4087

Abstract
Control of two basic ionization processes in dielectrics i.e. photo ionization and electron-electron impact ionization on intrinsic time and intensity scales is investigated experimentally and theoretically. Temporally asymmetric femtosecond pulses of identical fluence, spectrum and pulse duration result in different final free electron densities. We found that an asymmetric pulse and its time reversed counterpart address two ionization processes in a different fashion. This results in the observation of different thresholds for surface material modification in sapphire and fused silica. We conclude that control of ionization processes with tailored femtosecond pulses is suitable for robust manipulation of breakdown and thus control of the initial steps of laser processing of high band gap materials. (c) 2007 Optical Society of America.


Research Areas


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