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20 September 2004 Femtosecond ablation applied to deep-drilling of hard metals
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Proceedings Volume 5448, High-Power Laser Ablation V; (2004)
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States
Mechanisms responsible for the limitation of the aspect ratio obtained by deep drilling of hard metals are investigated in the present work. Cemented carbide targets have been irradiated with laser pulses of 100 fs duration and 100 μJ maximum energy delivered by a Ti:sapphire laser system. The experiments are carried out in different gas environments (vacuum, air, helium up to atmospheric pressure) with incident laser fluences ranging from 1 to 20 Jcm-2. During deep drilling, the laser-induced ablation plume is characterized by means of in-situ plasma diagnostics. Fast imaging is used to observe the expansion behavior of the plasma plume whereas time- and space-resolved emission spectroscopy is employed to analyze the plasma composition. After irradiation, the laser-produced craters were examined by optical microscopy. A correlation between the ablation plume characteristics and the morphological changes of the mciro-holes is established. The results indicate that nanoclusters, that present a significant part of the ablated material, are responsbile for the alteration of the crater shape in the high laser fluence regime.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sebastien Bruneau, Joerg Hermann, Gabriel Dumitru, and Marc L. Sentis "Femtosecond ablation applied to deep-drilling of hard metals", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004);


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