Energy Transport and Material Removal in Wide Bandgap Materials by a Femtosecond Laser Pulse
A new model is proposed which greatly improves the accuracy in predicting the ablation depth and, for the first time, can predict the flat-bottom crater shape for wide bandgap materials ablated by a femtosecond laser pulse. The model calculates the transient distributions of free electron density and free electron temperature. The quantum treatment is employed to account for the specific heat and the relaxation time for free electrons. The temporal and spatial dependent optical properties of the dense plasma are considered. The predicted threshold fluence and ablation depth for fused silica are in agreement with published experimental data.
L. Jiang and H. Tsai, "Energy Transport and Material Removal in Wide Bandgap Materials by a Femtosecond Laser Pulse," International Journal of Heat and Mass Transfer, Elsevier, Jan 2005.
The definitive version is available at http://dx.doi.org/10.1016/j.ijheatmasstransfer.2004.09.016
Mechanical and Aerospace Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Ablation Depth; Femtosecond Laser Pulse; Flat-Bottom Crater Shape
Article - Journal
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