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Femtosecond-laser induced ablation of silicate glasses and the intrinsic dissociation energy

: Grehn, Moritz; Seuthe, Thomas; Höfner, Michael; Griga, Nils; Theiss, Christoph; Mermillod-Blondin, Alexandre; Eberstein, Markus; Eichler, Hans Joachim; Bonse, Jörn

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Optical Materials Express 4 (2014), Nr.4, S.689-700
ISSN: 2159-3930
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IKTS ()
ablation thresholds; absorbed energy; dissociation energies; femtosecond laser pulse irradiation; intrinsic dissociation; material parameter; multi-photon absorption

The relation between ablation threshold fluence upon femtosecond laser pulse irradiation and the average dissociation energy density of silicate based multicomponent glass is studied. A simple model based on multiphoton absorption quantifies the absorbed energy density at the ablation threshold fluence. This energy density is compared to a calculated energy density which is necessary to decompose the glass compound into its atomic constituents. The results confirm that this energy density is a crucial intrinsic material parameter for the description of the femtosecond laser ablation threshold fluence of dielectrics.