It remains a big challenge to theoretically predict the material removals mechanism in femtosecond laser ablation. To bypass this unresolved problem, many calculations of femtosecond laser ablation of non-metals have been based on free electron density distribution without the actual consideration of the phase change mechanism. However, this widely-used key assumption needs further theoretical and experimental confirmations. By combining the plasma model and improved two-temperature model developed by the authors, this study focuses on investigating ablation threshold fluence, depth, and shape during femtosecond laser ablation of dielectrics through non-thermal processes (the Coulomb explosion and electrostatic ablation). The predicted ablation depths and shapes in fused silica, by using 1) the plasma model only and 2) the plasma model plus the two-temperature equation, are both in agreement with published experimental data. The widely-used assumptions for threshold fluence, ablation depth, and shape in the plasma model based on free electron density are validated by the comparison study and experimental data.
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ASME 2006 International Mechanical Engineering Congress and
Exposition
November 5–10, 2006
Chicago, Illinois, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-4785-3
PROCEEDINGS PAPER
Materials Removals During Femtosecond Laser Non-Thermal Ablation of Dielectrics Available to Purchase
Hai-Lung Tsai
Hai-Lung Tsai
University of Missouri at Rolla
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Lan Jiang
University of Missouri at Rolla
Hai-Lung Tsai
University of Missouri at Rolla
Paper No:
IMECE2006-15624, pp. 661-669; 9 pages
Published Online:
December 14, 2007
Citation
Jiang, L, & Tsai, H. "Materials Removals During Femtosecond Laser Non-Thermal Ablation of Dielectrics." Proceedings of the ASME 2006 International Mechanical Engineering Congress and Exposition. Heat Transfer, Volume 2. Chicago, Illinois, USA. November 5–10, 2006. pp. 661-669. ASME. https://doi.org/10.1115/IMECE2006-15624
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