| Issue |
Europhys. Lett.
Volume 56, Number 1, October 2001
|
|
|---|---|---|
| Page(s) | 138 - 144 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and opticalproperties | |
| DOI | https://doi.org/10.1209/epl/i2001-00499-9 | |
| Published online | 01 December 2003 | |
Time-resolved study of laser-induced breakdown in dielectrics
CEA/DSM/DRECAM,
Laboratoire des Solides Irradiés,
Ecole Polytechnique
91128 Palaiseau Cedex, France
Received:
20
March
2001
Accepted:
12
July
2001
We present the first femtosecond time-resolved study of the evolution of the laser-excited carrier density with the laser intensity, in various dielectrics of practical interest (SiO2, Al2O3, MgO) both above and below the breakdown threshold. These measurements demonstrate that the high electronic excitation responsible for optical breakdown in these solids is produced by multiphoton absorption by valence electrons, for pulses shorter than a few ps. No sign of electronic avalanche has been observed for such short pulses.
PACS: 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter / 72.20.Ht – High-field and nonlinear effects / 82.50.Pt – Multiphoton processes
© EDP Sciences, 2001
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