Aufsatz in einer Fachzeitschrift
Control of ionization processes in high band gap materials via tailored femtosecond pulses



Details zur Publikation
Autor(inn)en:
Englert, L.; Rethfeld, B.; Haag, L.; Wollenhaupt, M.; Sarpe-Tudoran, C.; Baumert, T.
Publikationsjahr:
2007
Zeitschrift:
Optics Express
Seitenbereich:
17855-17862
Jahrgang/Band:
15
Erste Seite:
17855
Letzte Seite:
17862
ISSN:
1094-4087

Zusammenfassung, 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.


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Zuletzt aktualisiert 2019-01-11 um 16:04