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Proceedings Paper

Laser ablation of dielectrics using ultrashort and temporally shaped laser pulses
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Paper Abstract

A significant improvement in the quality of ultrafast laser micromachining of brittle dielectrics is demonstrated by using temporally shaped pulse trains with sub-ps separation, synchronized with the material specific relaxation times. The individual material response to laser radiation depends on the efficiency of electron generation and on the ability to release the energy into the lattice. Loss mechanisms in the electron population, surface charging, as well as the strength of the electron-phonon interactions control the effectiveness of the energy deposition into the lattice. Knowledge of the response times of materials establishes a guideline for using temporally shaped pulses or pulse trains in order to optimize the structuring process with respect to the efficiency of material removal and reduction of the residual damage. The sequential energy delivery induces a material softening during the initial steps of excitation changing the energy coupling for the subsequent steps. This leads to lower stress, cleaner structures, and provides a material-dependent optimization process.

Paper Details

Date Published: 13 September 2002
PDF: 8 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482080
Show Author Affiliations
Razvan Stoian, Max-Born-Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Mark Boyle, Max-Born-Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Andreas Thoss, Max-Born-Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Arkadi Rosenfeld, Max-Born-Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Georg Korn, Max-Born-Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Ingolf V. Hertel, Max-Born-Institut fuer Nichtlineare Optik und Kurzzeitspektroskopie (Germany)


Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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