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Proceedings Paper

Ablation mechanism of fused silica under femtosecond laser pulse
Author(s): Shizhen Xu; Zhizhan Xu; Tianqing Jia; Haiyi Sun; Xiaoxi Li; Donghai Feng; Chengbin Li
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Paper Abstract

Based on the avalanche model, the mechanism of femtosecond laser-induced ablation in fused silica was investigated. The three microscopic processes, including the production of conduction band electrons (CBE), the deposition of laser energy, and the diffusion of CBE and energy, were solved by a finite element method (FEM) of two-dimension cylinder coordinate. The conduction band electrons (CBE) were produced through photoionization and impact ionization, which were calculated via Keldysh theory and Double-flux model, respectively. The accumulated charge and the electrostatic field were also calculated, and the evolution of microexplosion was discussed based on this model. The results indicate that the CBE and energy diffusion plays an important role in the ablation of dielectrics by femtosecond laser pulse.

Paper Details

Date Published: 13 January 2005
PDF: 8 pages
Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.575480
Show Author Affiliations
Shizhen Xu, Shanghai Institute of Optics and Fine Mechanics (China)
Zhizhan Xu, Shanghai Institute of Optics and Fine Mechanics (China)
Tianqing Jia, Shanghai Institute of Optics and Fine Mechanics (China)
Haiyi Sun, Shanghai Institute of Optics and Fine Mechanics (China)
Xiaoxi Li, Shanghai Institute of Optics and Fine Mechanics (China)
Donghai Feng, Shanghai Institute of Optics and Fine Mechanics (China)
Chengbin Li, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 5629:
Lasers in Material Processing and Manufacturing II
ShuShen Deng; Akira Matsunawa; Y. Lawrence Yao; Minlin Zhong, Editor(s)

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