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Proceedings Paper

Femtosecond breakdown and pre-breakdown behavior in thin dielectric films
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Paper Abstract

Dielectric oxide and fluoride films used for optical coatings are studied with femtosecond laser pulses with respect to their breakdown and pre-breakdown behavior. A phenomenological model with only three figures of merit is used to explain the measured breakdown thresholds for pulse durations from 25 fs to 1 ps. The temporal evolution of the dielectric constant in the pre-breakdown regime is obtained from transient reflection and transmission measurements after taking into account standing wave effects of pump and probe. In addition to electron-electron and electron-phonon scattering processes, the creation of a new sample state after a few hundred fs is observed. The experimental data are explained with a computer simulation based on the Boltzmann equation.

Paper Details

Date Published: 1 June 2004
PDF: 13 pages
Proc. SPIE 5340, Commercial and Biomedical Applications of Ultrafast Lasers IV, (1 June 2004); doi: 10.1117/12.538218
Show Author Affiliations
Mark Mero, Univ. of New Mexico (United States)
Jianhua Liu, Fudan Univ. (China)
Ali J. Sabbah, Univ. of New Mexico (United States)
Joachim Zeller, Univ. of New Mexico (United States)
Wolfgang G. Rudolph, Univ. of New Mexico (United States)
Kai Starke, Laser Zentrum Hannover e.V. (Germany)
Detlev Ristau, Laser Zentrum Hannover e.V. (Germany)


Published in SPIE Proceedings Vol. 5340:
Commercial and Biomedical Applications of Ultrafast Lasers IV
Joseph Neev; Christopher B. Schaffer; Andreas Ostendorf, Editor(s)

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