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Proceedings Paper

Optimal pulse duration for femtosecond laser ablation
Author(s): Yehiam Prior; Kaiyin Zhang; Vladimir Batenkov; Yuri Paskover; Jan-Hendrik Klein-Wiele; Peter Simon
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Paper Abstract

Femtosecond laser ablation occurs on timescales faster than the thermalization of the excited electrons and the lattice in solid materials. The ultrafast deposition of energy competes with the slower electron-phonon energy redistribution, raising the question of what is the optimal pulse duration for efficient deposition of energy while minimizing peripheral damage, and whether the shortest pulse is always the most efficient. We studied femtosecond laser ablation of silicon and several metals, varied the pulse duration while keeping all other parameters equal, and looked for optimal conditions. The main findings in our study are that at low fluences, not too high above the ablation threshold, the shortest pulses are the most efficient, whereas under high fluence conditions, well above the ablation threshold, longer pulses ablate more efficiently. In order to facilitate eventual direct, real time optimization, we developed a diagnostics tool for the monitoring of the ablation efficiency over a wide range of pulse durations. The intensity of the emission at atomic lines (i.e. the 289 nm line in Silicon, calibrated by plasma emission at other wavelengths) provides such information, while optical and AFM microscopy provide reliable information about the quality of ablated structures.

Paper Details

Date Published: 20 September 2004
PDF: 8 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.546475
Show Author Affiliations
Yehiam Prior, Weizmann Institute of Science (Israel)
Kaiyin Zhang, Weizmann Institute of Science (Israel)
Vladimir Batenkov, Weizmann Institute of Science (Israel)
Yuri Paskover, Weizmann Institute of Science (Israel)
Jan-Hendrik Klein-Wiele, Laser-Lab. Goettingen e.V. (Germany)
Peter Simon, Laser-Lab. Goettingen e.V. (Germany)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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