Title

Energy Transport and Material Removal in Wide Bandgap Materials by a Femtosecond Laser Pulse

Abstract

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.

Department(s)

Mechanical and Aerospace Engineering

Sponsor(s)

National Science Foundation (U.S.)

Keywords and Phrases

Ablation Depth; Femtosecond Laser Pulse; Flat-Bottom Crater Shape

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 Elsevier, All rights reserved.

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